How to Use Intrva

Getting Started

Intrva is a flashcard app that uses spaced repetition to help you remember anything. You can create cards manually or use AI to generate entire decks from a topic.

Creating an Account

Sign up with your email or use Google sign-in for quick access. After signing up, you'll need to verify your email before you can start creating decks.

Dashboard Overview

Your dashboard shows key statistics at a glance:

• Cards reviewed today — how many cards you've studied
• Cards due — cards waiting for review
• Success rate — your performance over the last 7 days
• Study streak — consecutive days of studying
• 7-day forecast — upcoming cards due each day

Managing Decks

Decks are collections of flashcards organized around a topic. Each deck tracks your progress independently.

Creating a Deck

To create a deck manually:

1. Go to Decks from the dashboard
2. Click New Deck
3. Enter a title and optional description
4. Start adding cards

Alternatively, use AI generation to create a deck with cards automatically.

Deck Statistics

Each deck displays four status counts:

Copying a Deck

Duplicate any deck by clicking the Copy button on the deck detail page. This creates a new deck with all the same cards but fresh progress. This can be useful if you want to create the inverse of an existing deck to test recall instead of only memorisation.

Deleting a Deck

Delete a deck from its detail page. This removes all cards and progress permanently. You'll be asked to confirm before deletion.

Managing Cards

Each card has a front (question/prompt) and back (answer). You can also add notes to help you remember.

Adding Cards Manually

From a deck's detail page:

1. Click Add Card
2. Enter the front content (what you'll see during study)
3. Enter the back content (the answer)
4. Optionally add front notes (shown with the question) or back notes (shown with the answer)

Using Card Notes

Notes are helpful for additional context:

• Front notes — pronunciation guides, hints, or context shown with the question
• Back notes — example sentences, mnemonics, or explanations shown with the answer

You can toggle front notes visibility in deck settings if you prefer to study without hints. When front notes are hidden, you can still tap the (...) indicator to reveal the note content temporarily for that card during the current study session.

Editing Cards

Click any card in the deck to view it, then click Edit to modify its content, notes, or audio.

AI Card Generation

Use AI to generate flashcard decks automatically. This is the fastest way to create high-quality study material.

Generating a New Deck

To create an AI-generated deck:

1. Click Generate Deck from the dashboard or decks page
2. Choose the front language (e.g., Japanese)
3. Choose the back language (e.g., English)
4. Enter a topic (e.g., "Common greetings")
5. Optionally add context (e.g., "JLPT N5 level vocabulary")
6. Select how many cards to generate (1-50)

Reviewing Pending Generations

Generated decks appear in Pending Generations for review. You can select which cards to keep before saving. You can have up to 3 pending generations at a time.

Generating More Cards

Add cards to an existing deck by clicking Generate More on the deck detail page. The AI uses your existing cards as context to avoid duplicates and maintain consistency.

Enhancing Cards

Improve existing cards with AI enhancements. Select cards to enhance, then describe what you want (e.g., "Add pronunciation guides" or "Include example sentences").

1. Go to deck detail and click Enhance
2. Select the cards you want to enhance
3. Describe the enhancement you want
4. Review the AI's suggestions side-by-side with originals
5. Choose which enhancements to apply

Studying Cards

The study session is where learning happens. Cards are shown based on the spaced repetition algorithm to maximize retention.

Starting a Study Session

Click Study on any deck to begin. The session loads cards in batches (configurable in settings). Due reviews are shown first, then new cards up to your daily limit.

The Study Interface

During study:

1. You see the card's front (question)
2. Try to recall the answer
3. Click Show Answer or press Space/Enter
4. Rate how well you remembered (1-4)

Rating Your Recall

After seeing the answer, rate your recall:

Auto-Save and Progress

Your progress is saved automatically every 30 seconds. A dot indicator shows when you have unsaved changes. You can also click Save & Exit to save manually and leave the session.

The Spaced Repetition Algorithm

Intrva uses a modified SM-2 algorithm with learning steps. This scientifically-proven method shows you cards right before you're likely to forget them.

Learning Steps

New cards progress through learning steps before graduating to long-term scheduling:

Rating "Again" resets to the first step. Rating "Easy" graduates the card immediately.

Ease Factor

After graduation, each card has an "ease factor" (starting at 2.5) that determines how quickly intervals grow:

• Rating 1 (Again) — Ease decreases by 0.2 (minimum 1.3)
• Rating 2 (Hard) — Ease decreases by 0.15
• Rating 3 (Good) — Ease stays the same
• Rating 4 (Easy) — Ease increases by 0.15

Interval Calculation

For graduated cards, the next interval = previous interval × ease factor. The maximum interval is 365 days.

Audio and Text-to-Speech

Generate pronunciation audio for your cards using Google's neural text-to-speech. This is especially useful for language learning.

Generating Audio

1. Go to a deck and click Generate Audio
2. Select the cards you want audio for
3. Choose the language/voice
4. Click generate

Supported Languages

Audio generation supports 20+ languages with high-quality neural voices, including Japanese, Chinese, Korean, English, Spanish, French, German, Russian, Arabic, and more.

Playing Audio During Study

Cards with audio show a play button. Click it to hear the pronunciation. Audio plays the front of the card (the question/prompt).

Deck Settings

Each deck has its own settings to customize your study experience.

Daily New Card Limit

Controls how many new cards are introduced per day (0-500). Set this based on how much time you have to study. A lower limit means slower progress but less daily workload.

Review Batch Size

How many cards are loaded per study session (1-50). Larger batches mean fewer interruptions but longer sessions.

Show Front Notes

Toggle whether front notes (hints, pronunciation) are shown during study. Turn this off for a harder challenge once you're more familiar with the material.

Reset Progress

Delete all review history for a deck while keeping the cards and settings. Use this to start fresh if you want to relearn the material.

Account Settings

Customize your Intrva experience from the settings page.

Theme

Choose between light mode, dark mode, or follow your system preference.

Accent Color

Personalize the app with different accent colors: emerald (default), blue, violet, rose, orange, or teal.

Language

Change the interface language. Currently supports English and Japanese.

Understanding Credits

Credits are used for AI-powered features. Here's a summary of credit costs:

Free accounts receive monthly credits. View pricing for subscription plans and credit packs.

Tips for Effective Learning

• Study daily — Consistency beats long, infrequent sessions
• Be honest with ratings — The algorithm works best when you rate accurately
• Start small — Begin with 10-20 new cards per day and adjust
• Use context — Add notes and example sentences to make cards memorable
• Review first — Always clear your due reviews before learning new cards
• Don't overload — Too many new cards creates a review backlog