Learn with Koki, a little easier every day.

Explore the App

When you open Koki for the first time, you'll see a quick introduction to its main features.

Follow the introduction to learn how Koki works, or tap Skip to move straight to the setup process.

Discover Spaced Repetition System (SRS)

Koki uses Spaced Repetition System (SRS), a learning technique that helps you remember vocabulary for longer by reviewing words at the right time.

Instead of reviewing every word equally often, Koki automatically adjusts your review schedule based on how well you remember each word:

• Words you struggle with: Reviewed more frequently.
• Words you remember well: Reviewed at longer intervals.

This helps you spend less time on familiar words and focus on those that need more practice.

Choose Your Native Language

Select your native language and tap Continue.

Koki uses this language to provide translations and explanations, making it easier to understand new vocabulary and example sentences.

Set Your Name and Daily Study Reminder

Enter your name and choose when you'd like Koki to remind you to study.

For example, if you prefer studying in the evening, set your reminder to 8:00 PM.

That's it! You're ready to explore Koki's vocabulary packs and start learning.

Take a Level Test

Not sure where to start? Take a short test to help Koki assess your current proficiency level.

Based on your results, Koki will recommend vocabulary packs that match your ability.

Explore Personalized Recommendations

Visit the For You section to discover vocabulary packs recommended for your level.

These suggestions help you find suitable learning materials without spending time searching through the entire library.

Browse and Choose a Vocabulary Pack

Select the language you want to learn and explore vocabulary packs by topic, difficulty, or learning goal.

Each pack provides useful information to help you decide:

• Word Count: The total number of words included in the pack.
• Learners: The number of people who have studied the pack.
• Level: The recommended proficiency level.

Choose a pack that matches your current ability and learning goals.

Start Learning and Track Your Progress

Once you've chosen a pack, you can start learning using any of Koki's three main study modes:

• Flashcards: Learn and review vocabulary using Spaced Repetition System (SRS).
• Writing: Strengthen your memory through listening, spelling, and writing practice.
• Quiz: Test your knowledge with interactive exercises.

Once you start studying, the pack will automatically appear in your Learning section, where you can track your progress and pick up where you left off.

You can also study multiple vocabulary packs at the same time. Koki brings together words that are due for review, so you can review them all in one place.

Flip Cards, Translate Content, and Track Your Memory

When you start a Flashcard session, Koki displays one card at a time.

Tap a card to flip it and reveal its meaning. You can also tap a definition or example sentence to see a translation in your selected native language.

After reviewing the card, indicate how well you remember it:

• Swipe right: If you remember the word.
• Swipe left: If you don't remember the word yet.

Koki uses your responses to track your progress and schedule future reviews.

Practice Difficult Words

Words you haven't remembered are automatically collected in the Difficult Words button on the Flashcard screen.

Tap this button to practice those words using different learning activities:

• Quiz: Test your memory with interactive questions.
• Speaking: Practice saying difficult words aloud.
• Writing: Improve your spelling and recall through writing exercises.

This allows you to focus on the words that need more attention without repeating the entire vocabulary pack.

Use Built-in Flashcard Learning Tools

Koki provides several useful tools directly on the Flashcard screen:

• Speech Mode: Say the word aloud, and Koki automatically advances to the next card when your pronunciation is recognized as correct.
• Pronunciation: Practice pronouncing the word on your current card.
• Audio: Tap to hear how the word is pronounced.
• Notes: Add personal notes, such as your own example sentences or memory tips.
• Hint Mode: Tap the clover icon to reveal helpful hints when you struggle to remember a word.
• Report Error: Report incorrect words, definitions, or examples so the Koki team can review them.

You can combine these tools to create a learning experience that works best for you.

Remember Words for Longer with Spaced Repetition System (SRS)

Koki uses Spaced Repetition System (SRS) to help you retain vocabulary over time.

Instead of reviewing every word equally often, Koki automatically adjusts review intervals based on your learning history and responses.

• Words you struggle with: Appear again sooner.
• Words you remember well: Are scheduled for review at longer intervals.

This helps you spend more time on difficult vocabulary and less time reviewing words you already know.

View Words You're Learning and Words You've Mastered

You can track your vocabulary progress directly from the Flashcard screen.

• Learning Words: Tap the number of words you're currently learning to view the full list.
• Mastered Words: Tap the number of words you've remembered to see the vocabulary you've already mastered.

These lists make it easy to check your progress and review your learning status.

Customize Your Learning Experience

Open the Settings menu on the right side of the Flashcard screen to personalize your study sessions.

The menu includes the following options:

Choose Vocabulary Groups

Browse the available vocabulary groups and select the ones you want to focus on.

For example, if a vocabulary pack contains multiple topics, you can choose a specific group instead of studying all the words at once.

Filter by Tags

View the tags assigned to your Flashcards and select the ones you want to practice.

You can also create custom tags to organize your vocabulary, such as "Important Words," "Easily Confused," or "Need More Practice."

Change the Front of Your Cards

Choose what appears on the front of each Flashcard to change how you practice.

For example:

• Word First: See the word and try to recall its meaning.
• Meaning First: See the meaning and try to recall the word.

Switching between these options helps you strengthen your memory in different ways.

Advanced Settings

Customize the number of words you study and adjust review intervals used by Spaced Repetition System (SRS).

These settings allow you to adapt your learning schedule to your available time and personal goals.

Update Vocabulary Data

Download the latest updates to your vocabulary pack, including new or revised content from Koki.

Reset Learning Progress

If you want to start a vocabulary pack again from the beginning, you can reset its learning progress.

Important: Resetting your progress deletes your existing learning data for that pack. Make sure you want to start over before confirming.

Complete a 20-Word Study Round

By default, each Flashcard study round contains 20 words.

At the end of the round, Koki displays a summary showing:

• Remembered Words: Words you successfully recalled.
• Words to Review: Words you haven't remembered yet.

You can continue to the next round or switch to another learning mode:

• Pronunciation: Practice saying the words aloud.
• Writing: Reinforce your memory through spelling and writing.
• Quiz: Test what you've learned with interactive exercises.

Combining different study modes helps reinforce your vocabulary through multiple types of practice.

Practice Handwriting

For languages with different writing systems, such as Chinese, Japanese, and Korean, Koki offers handwriting practice to help you become familiar with writing characters.

Follow the guided strokes and practice writing directly on your screen.

This helps you learn character shapes, become familiar with stroke order, and improve your ability to recognize and remember written words.

Practice Writing with Spaced Repetition System (SRS)

Koki's basic Writing mode uses Spaced Repetition System (SRS) to help you review vocabulary at the right time.

Listen to the word being spoken, then type the word you hear.

Each writing round contains 20 words. After completing a round, you can review your results to see which words you spelled correctly and which ones need more practice.

Words you struggle with will be scheduled for additional review, helping you improve your spelling and long-term memory.

Focus on Difficult Words

The Difficult Words mode helps you practice vocabulary that you frequently forget or have trouble spelling.

Instead of reviewing every word in your vocabulary pack, you can focus on the words that need extra attention.

Listen carefully, write the correct word, and continue practicing to strengthen your memory and spelling accuracy.

Practice Listening and Writing with AI

With AI Writing, Koki generates a passage for you to practice listening and writing.

Listen to the audio, then write down the passage you hear.

This activity helps you develop several skills at the same time:

• Listening Comprehension: Improve your ability to understand spoken language.
• Writing and Spelling: Practice writing complete sentences accurately.
• Vocabulary in Context: Reinforce vocabulary by hearing and using words in meaningful sentences.

AI Writing is especially useful when you're ready to move beyond individual words and practice longer passages.

Mixed Quiz — Practice with Different Question Types

Mixed Quiz combines several types of questions into a single practice session, helping you review vocabulary in different ways.

Depending on the question, you may be asked to:

• Listen and Identify: Listen to a word and choose the correct answer.
• Fill in the Blanks: Complete a word or sentence by filling in missing information.
• Picture Quiz: Look at an image and identify the matching word.
• Multiple Choice: Select the correct answer from the available options.

By combining different question types, Mixed Quiz helps you strengthen vocabulary recognition, recall, and listening skills.

Match Quiz — Match Words with Their Meanings

In Match Quiz, your goal is to match each vocabulary word with its correct meaning.

Simply connect the matching pairs to complete the exercise.

This mode helps you recognize vocabulary more quickly, strengthen word-meaning associations, and improve your recall through interactive practice.

Fill in the Blanks — Complete the Missing Words

Fill in the Blanks challenges you to complete sentences or exercises by entering the missing words.

Read the provided content, identify what's missing, and fill in the correct answers.

This exercise helps you:

• Reinforce vocabulary in context.
• Improve spelling and word recall.
• Understand how words are used in sentences.

You can also export exercises as PDF files to save, print, or complete later without using the app.

Pronunciation — Practice Words and Sentences with AI

Koki's Pronunciation mode lets you practice speaking both individual words and complete sentences.

This mode uses Spaced Repetition System (SRS) to schedule reviews based on your learning progress, helping you spend more time practicing words and sentences that need improvement.

To practice:

1. Open Pronunciation mode and select a word or sentence.
2. Read the displayed content aloud.
3. Koki recognizes your speech and evaluates your pronunciation.
4. Review the result and try again to improve your accuracy.

Need help with pronunciation?

If your pronunciation isn't quite right, tap Show Pronunciation Guide.

Koki's AI will analyze your pronunciation, highlight areas that need improvement, and provide guidance to help you pronounce the word or sentence more accurately.

You can repeat the exercise as often as needed to build confidence and improve your speaking skills.

Explore Community Decks

Community Decks are flashcard collections created and shared by Koki users.

Browse available decks to find content that matches your interests and learning goals.

You can use Points earned through your learning activities to unlock decks you like. Spending Points to unlock a deck is also a way to recognize and support the creator's effort.

Once you've unlocked a deck:

• It automatically appears in My Decks.
• You can study it using Flashcards, Writing, or Quiz.
• You can leave a rating and comment to share your experience and provide feedback to the creator.

Study Your Unlocked Decks

Every deck supports Koki's three main learning modes:

• Flashcards: Learn and review vocabulary through interactive cards and Spaced Repetition System (SRS).
• Writing: Strengthen your memory and spelling through writing exercises.
• Quiz: Test your knowledge with interactive questions and activities.

You can switch between these modes to practice the same content in different ways and reinforce what you've learned.

Create Your Own Flashcard Decks

In addition to exploring Community Decks, you can create your own collections to study vocabulary, concepts, or anything else you want to remember.

Koki offers several ways to create cards.

Create Cards with AI

Take a photo or enter a passage of text, and let Koki's AI help turn the content into flashcards.

This is especially useful when you want to create study materials from notes, textbooks, or other learning resources without entering every card manually.

Import Cards from CSV

If you already have a vocabulary list, you can import multiple cards at once using a CSV file.

To get started:

1. Download the official CSV template provided by Koki.
2. Fill in your content using the required format.
3. Save the completed CSV file.
4. Import it into your deck.

Make sure you follow the template structure to avoid import errors.

Add Cards Manually or with AI Assistance

You can also create flashcards one at a time by entering information such as words, meanings, and example sentences.

If you've entered only part of a card, tap the AI button to let Koki help complete the missing information.

This gives you the flexibility to create cards yourself while saving time with AI assistance.

Add Images and Audio to Your Flashcards

Make your flashcards more engaging and easier to remember by adding visual and audio content.

Koki provides:

• Built-in Image Library: Choose from available images to illustrate your cards.
• Text-to-Speech (TTS): Automatically generate audio from text using professional-quality voices.

These tools help you create flashcards that combine text, images, and audio without having to prepare every resource yourself.

Organize and Move Cards Between Decks

As your flashcard collection grows, you may want to reorganize your study materials.

Koki allows you to move cards from one deck to another, making it easier to group related content without having to recreate cards.

For example, you can move vocabulary from different decks into a single topic-specific deck for more focused practice.

Share Your Decks with the Community

Once you've created a useful flashcard deck, you can make it public and share it with the Koki community.

Other learners can discover your deck, unlock it with Points, and use it for their own studies.

When users unlock your shared deck, you can earn Points according to Koki's reward rules.

Learners who have unlocked your deck can also leave ratings and comments, giving you valuable feedback to improve your content.

Sharing your decks is a great way to contribute to the learning community while earning recognition for your work.

Create a Class with Your Favorite Study Materials

You can create a class to study with friends or other members of the Koki community.

When creating a class, choose from two types of learning materials:

• Koki Vocabulary Packs: Ready-made vocabulary collections provided by Koki.
• Community Decks: Public flashcard decks shared by other Koki users.

Note: Private decks cannot be used to create a class. A community deck must be public before you can select it.

Set Class Dates and Required Points

When creating a class, you can customize its settings:

• Start Date: Choose when the class begins.
• End Date: Set when the class finishes.
• Points Deposit: Decide how many Points each member must deposit to join.

The deposit system encourages members to stay committed to their learning goals throughout the class.

Join a Class and Build the Reward Pool

You can browse available classes, choose one that matches your interests, and join by depositing the required Points.

Once a class reaches 10 members, it becomes eligible for additional rewards from Koki.

The system contributes 1 Point per member per day to the class's reward pool.

For example, a class with 10 members can receive an additional 10 Points per day from Koki.

These Points are added to the class reward pool and will be distributed to eligible members when the class ends.

Complete Your Goals and Earn Rewards

To qualify for rewards when a class ends, you must meet both requirements:

• At least 80% attendance: Complete learning activities on at least 80% of the scheduled class days.
• At least 80% card coverage: Go through at least 80% of the flashcards in the assigned vocabulary pack or deck.

When the class ends, the reward pool is distributed among members who meet both requirements, according to Koki's reward rules.

This system encourages consistent participation and helps everyone stay focused on completing their learning goals.

Track Your Classmates' Progress

Koki lets you monitor learning progress throughout the class.

You can:

• View your own progress toward the class goals.
• Check other members' learning progress.
• Track how close you are to meeting the attendance and card coverage requirements.

Seeing how everyone is progressing can help members stay motivated and encourage one another to keep learning.

Connect and Learn with Your Classmates

Each class includes a space where members can communicate and share their learning experiences.

You can discuss challenging vocabulary, exchange study tips, ask questions, and encourage classmates to complete their goals.

Studying together makes it easier to stay accountable and creates a more engaging learning experience.

Build Your Daily Learning Streak

Koki tracks your consecutive study days through the Streak feature.

To maintain your streak, simply complete at least one lesson every day.

Each consecutive day adds to your streak, helping you stay motivated and build a lasting learning habit.

The longer your streak, the more it reflects your consistency and dedication to learning.

Link Your Account and Sync Your Progress

To unlock Streak, you'll need to link your Koki profile to your Google or Apple account.

There's no need to create a separate username or password.

Once your account is linked, Koki can sync your supported learning data across devices, allowing you to continue studying and maintain your streak when switching phones or using another device.

Protect Your Streak with Streak Freeze

Busy day? Don't want to lose your hard-earned streak?

With Streak Freeze, you can protect your consecutive study days when you're unable to complete a lesson.

Use your accumulated Points to purchase a Streak Freeze.

When applied, a Streak Freeze protects your current streak if you miss a study day, so you won't have to start your streak over from day one.

Track Your Streak Progress

Visit the Streak section to see your current streak and track your study consistency over time.

Check your progress regularly and aim to complete at least one lesson each day to extend your streak.

You can also set a daily study reminder in Koki to help you stay on track.

Earn Points Through Learning Activities

You can earn Points by participating in different learning activities on Koki.

These include:

• Flashcards: Earn Points as you study and complete flashcard rounds.
• Writing: Collect Points by completing writing exercises.
• Mini Quiz: Earn Points by practicing and testing your vocabulary knowledge.

Points are awarded according to Koki's reward rules, which you can review in the app.

The more consistently you study, the more opportunities you have to earn Points.

Check Your Points Balance

You can easily track how many Points you've earned on Koki.

Check your current balance to see how many Points are available and decide how you'd like to use them.

You can save your Points for future rewards or spend them on features that support your learning goals.

Unlock Community Decks with Points

Use your Points to unlock flashcard decks created and shared by other members of the Koki community.

Spending Points to unlock a deck is also a way to recognize and support the creator's work.

Once unlocked, the deck will appear in My Decks, where you can study it using Flashcards, Writing, or Quiz.

Upgrade to Premium with Points

Koki allows you to exchange your accumulated Points for eligible Premium benefits.

Once you've earned enough Points, you can select an available Premium option and redeem your Points directly in the app.

Premium gives you access to additional learning benefits, including unlimited deck creation, high-quality audio, and 2× daily learning Points.

Use Points to Join Classes and Earn Rewards

When joining a Class, you'll need to deposit the number of Points required by the Class Leader.

To qualify for a share of the class's reward pool, you must meet both requirements:

• Complete learning activities on at least 80% of the class days.
• Go through at least 80% of the assigned flashcards.

Classes with at least 10 members are also eligible for additional system rewards. Koki contributes 1 Point per member per day to the class's reward pool.

At the end of the class, the reward pool is distributed among eligible members according to Koki's reward rules.

Protect Your Streak with Points

You can use Points to purchase Streak Freeze, which helps protect your consecutive study days.

If you're unable to complete a lesson on a particular day, a Streak Freeze can prevent your current streak from being reset.

This is especially useful when you want to maintain your learning habit but occasionally have a busy day.

Support Charitable Programs Through Koki Care

Your learning efforts can also make a difference beyond the app.

Through Koki Care, you can donate your accumulated Points to charitable programs supporting children in need.

Each program has a Points goal. Once enough Points have been contributed, Koki organizes the corresponding charitable activity.

You may also have the opportunity to register and participate in these activities alongside the Koki team.

By donating Points, you can turn your learning achievements into meaningful contributions to the community.

Earn Points by Sharing Your Decks

Have you created a helpful flashcard deck?

Share it with the Koki Community so other learners can discover and use your content.

When other users unlock your public deck with Points, you can receive rewards according to Koki's creator reward rules.

This encourages users to share valuable learning materials and contribute to the growing Koki community.

Explore Learning Challenges

Koki offers several learning challenges designed to help you build lasting study habits and work toward meaningful goals.

You can choose from:

• 30-Day Challenge: A great way to start building a daily learning habit.
• 90-Day Challenge: Stay consistent and strengthen your study routine over a longer period.
• 365-Day Challenge: Commit to a full year of learning and challenge yourself to stay on track.

Explore each challenge to find one that matches your goals and schedule.

Join a Challenge and Track Your Progress

Choose a challenge that interests you and review its participation requirements before joining.

Once you've joined, complete the learning activities required by the challenge.

Koki lets you track your progress, see how much you've accomplished, and check what you still need to complete.

Review your progress regularly to stay motivated and keep working toward your goal.

Complete Challenges and Earn Rewards

When you successfully meet all the requirements of a challenge, Koki recognizes your achievement.

Depending on the challenge, eligible participants may receive:

• Certificates: Recognize your dedication and successful completion of a learning challenge.
• Koki Rewards: Prizes or other rewards offered according to the rules of each challenge.

Check the challenge details for specific completion requirements, available rewards, and eligibility conditions.

Explore the Points Leaderboard

Koki's Leaderboard allows you to compare your learning achievements with other members of the community.

The Points Leaderboard ranks learners based on the Points they've accumulated through learning activities such as Flashcards, Writing, and Mini Quiz.

You can check your position and stay motivated to improve your performance through regular practice.

Explore the Study Time Leaderboard

In addition to Points, Koki offers a Study Time Leaderboard that ranks learners based on their total study time.

You can see how much time you've spent learning and compare your study activity with other Koki users.

This helps you monitor your consistency and encourages you to make learning part of your daily routine.

Track Your Achievements and Keep Improving

Challenges and Leaderboards give you different ways to measure your progress.

Use Challenges to work toward personal learning goals, and check the Leaderboard to see how your achievements compare with the wider community.

Combine regular Flashcards, Writing, and Quiz practice to build your knowledge, earn Points, and improve your learning performance over time.

Remember that steady progress matters more than reaching the top of the rankings.

Explore Koki Care Programs

Visit Koki Care to discover ongoing charitable programs.

Each program provides information about its purpose, fundraising goal, and progress toward the required number of Points.

Browse the available programs to learn how your contributions can help children in need.

Donate Your Learning Points

You can use the Points you've earned through activities such as Flashcards, Writing, and Mini Quiz to support a charitable program.

To contribute:

1. Open Koki Care and choose a program you'd like to support.
2. Review the program's goal and current progress.
3. Select the number of Points you want to donate.
4. Confirm your contribution.

Every donation brings the program one step closer to reaching its goal.

Join Koki's Charity Activities

When a program reaches its Points goal, Koki organizes the planned charitable activity to support children facing difficult circumstances.

You can also register to participate in these activities alongside the Koki team and other community members.

It's an opportunity to go beyond donating Points and take part in meaningful real-world activities that bring people together.

Follow Program Updates and Results

Stay informed about the charitable programs you've supported through Koki Care.

You can follow program updates, learn about completed activities, and see how contributions from the Koki community are making a difference.

This helps you understand how your learning efforts contribute to meaningful outcomes beyond the app.

Explore Premium Benefits

Upgrading to Koki Premium unlocks a range of benefits designed to enhance your learning experience:

• Unlock All Vocabulary Packs: Access all Koki vocabulary packs across different languages, topics, and proficiency levels.
• Unlimited Deck Creation: Create and manage as many personal flashcard decks as you need.
• High-Quality Audio: Improve your listening and pronunciation with professional-quality text-to-speech voices.
• 2× Daily Learning Points: Earn twice the usual Points from eligible learning activities each day, helping you accumulate rewards faster.
• Sync Learning Progress: Continue studying across devices using your linked Google or Apple account.
• Ad-Free Learning: Enjoy a distraction-free experience without advertisements.

Choose the Right Premium Plan

Koki offers different Premium plans to match your learning goals and preferred duration.

• 1-Month Premium: A flexible option for trying Premium features over a shorter period.
• 12-Month Premium: Ideal for learners who plan to study consistently throughout the year.
• Lifetime Premium: Make a one-time purchase to enjoy Premium benefits for the lifetime of the plan, subject to its terms.

You can view the latest prices, plan details, and available offers on the Koki website: koki.vn/pricing.

Purchase Premium in the App

You can upgrade to Premium directly through Koki Flashcards using the App Store or Google Play.

Follow these steps:

1. Open Koki Flashcards.
2. Go to the Premium section.
3. Select the Premium plan that works best for you.
4. Review the price, duration, and subscription terms.
5. Complete your purchase through the App Store or Google Play.
6. Once your payment is successful, check your Premium status in the app.

Note: Prices, currencies, and payment terms may vary depending on your country and the platform you're using.

Purchase Premium Through the Koki Website

You can also purchase Premium through Koki's official website and receive an activation code.

To get started:

1. Visit koki.vn.
2. Open the Premium Plans page.
3. Choose the plan you'd like to purchase.
4. Enter your email address to receive your activation code.
5. Complete the payment using the instructions provided on the website.
6. After your payment is confirmed, your Premium activation code will be sent to your email.

You can then redeem the code in the Koki Flashcards app to activate your Premium benefits.

Activate Premium with a Gift Code

If you've purchased Premium through the Koki website or received a promotional Gift Code, you can redeem it directly in the app.

Follow these steps:

1. Open Koki Flashcards.
2. Sign in with or link your Google or Apple account.
3. Go to the Profile tab.
4. Select Redeem Gift Code.
5. Enter your activation code.
6. Tap Confirm to activate your Premium benefits.

Once the code has been successfully redeemed, you can check your Premium status in your Profile.

Note: Gift Codes must be valid and meet the conditions of the promotion or offer under which they were issued.

Upgrade to Premium with Points

Koki also allows you to redeem your accumulated Points for eligible Premium benefits.

You can earn Points through learning activities such as:

• Flashcards: Study vocabulary and complete flashcard rounds.
• Writing: Practice spelling and improve your writing skills.
• Mini Quiz: Reinforce your knowledge through interactive exercises.

Once you've earned enough Points, select an available Premium reward and follow the in-app instructions to redeem it.

As a Premium member, you'll also benefit from 2× Daily Learning Points, allowing you to earn rewards faster through eligible daily study activities.

Check and Manage Your Premium Membership

After upgrading, you can visit Profile to check your Premium status and expiration date.

If you've linked a Google or Apple account, you can sign in with the same account on another device to access the Premium benefits associated with your Koki account.

For time-limited plans, check your expiration date so you can renew your membership when needed.

If you purchased an auto-renewing subscription through the App Store or Google Play, you can manage or cancel the subscription through the corresponding platform's subscription settings.

When your Premium membership expires, you can continue using Koki's free features.

Set Up Your Profile and Link Your Account

When you first start using Koki, a profile is automatically created for you.

You can begin learning immediately without signing up or creating a password.

To access features that require a linked account, you can sign in with Google or Apple.

This makes it easy to access your Koki account without having to remember another username or password.

Sync Your Learning Progress Across Devices

Once you've linked your Google or Apple account, Koki can sync your supported learning data across devices.

To continue learning on another device, simply sign in using the same linked account.

Your saved vocabulary and learning levels can then be restored, allowing you to continue from your previous progress.

Note: Some detailed learning history, such as past session statistics, may not be available across devices. Koki continues to improve its synchronization features.

View and Manage Your Learning History

Visit the Profile section to access your learning history and review the study activities recorded by Koki.

This helps you keep track of your learning journey and revisit information about your previous activities.

You can also access available learning data management options from your Profile.

Invite Friends and Earn Rewards

Want to learn together with friends?

Use Invite Friends to introduce Koki to others and earn rewards through the referral program.

To get started:

1. Open Profile and select Invite Friends.
2. Share your invitation link or referral code with your friends.
3. Invite them to join Koki and start learning.
4. Earn eligible rewards when your friends meet the referral program's requirements.

You can check the referral program details for information about reward conditions and eligibility.

Redeem Gift Codes

If you've received a Gift Code from Koki, you can redeem it directly from your Profile.

Gift Codes may be provided through Premium purchases, promotional campaigns, or special events.

To redeem a code:

1. Open Profile.
2. Select Redeem Gift Code.
3. Enter your Gift Code.
4. Tap Confirm to activate the corresponding benefits.

For example, a valid Premium Gift Code can be used to activate Premium benefits on your account.

Note: Gift Codes must be valid and may be subject to expiration dates or specific redemption conditions.

Add Koki Widgets to Your Home Screen

Koki supports home screen widgets, giving you quick access to learning content without having to navigate through the app.

Add a Koki widget to your phone's home screen to make vocabulary practice more convenient.

Widgets help you fit short learning sessions into your daily routine, making it easier to study whenever you have a few spare moments.

The steps for adding widgets may vary depending on your device and operating system.

Manage and Delete Your Learning Data

Koki provides options to help you manage your learning data.

If you'd like to start over, you can use the available reset or deletion options to remove your previous learning progress.

Before proceeding, review the confirmation message carefully to understand which information will be deleted.

Important: Deleting learning data may permanently remove saved progress and learning results. Make sure you want to reset your data before confirming.

Delete Your Koki Account

If you no longer wish to use Koki, you can request account deletion directly from the Profile section.

To delete your account:

1. Open Profile.
2. Find the Delete Account option.
3. Review the account deletion information.
4. Follow the on-screen instructions to confirm your request.

Deleting your account may permanently remove your account information and associated learning data, subject to Koki's data retention policies.

Important: Account deletion is different from resetting learning progress. Make sure you understand the consequences before confirming.