AnkiDroid v2.25.1 - Spaced Repetition Flashcard Learning System
AnkiDroid is the world's most powerful, acclaimed free and open-source spaced repetition flashcard, active recall learning, and memorization platform...
Technical Specifications & System Requirements
Software notes
Features
- Proven SM-2 Spaced Repetition Algorithm.
- Sync Decks Seamlessly with AnkiWeb & Desktop optimized for Android.
Considerations
- Requires storage permissions to manage and access local file directories.
AnkiDroid for Android — Official Open-Source Spaced Repetition (SRS) Flashcards APK
AnkiDroid is the world's most powerful, acclaimed free and open-source spaced repetition flashcard, active recall learning, and memorization platform developed by the AnkiDroid Community for Android smartphones, tablets, and e-ink devices. Based on scientifically proven cognitive retention algorithms (SuperMemo SM-2 and next-generation FSRS), AnkiDroid helps medical students, language learners, law candidates, and researchers memorize massive amounts of knowledge permanently—featuring cloud synchronization with AnkiWeb, rich media support (LaTeX math, audio pronunciation, image occlusion), whiteboard drawing, and customized review heatmaps with zero commercial advertisements.
🌟 Core Architecture & Engineering Highlights
AnkiDroid is engineered around scientific cognitive psychology models designed to optimize long-term memory consolidation.
Modern Spaced Repetition Scheduling Engine (SM-2 & FSRS)
AnkiDroid calculates the exact moment you are about to forget a piece of information and schedules review intervals accordingly. It supports both the classic SuperMemo SM-2 algorithm and the revolutionary modern FSRS (Free Spaced Repetition Scheduler). By analyzing your historical recall accuracy across four response buttons (Again, Hard, Good, Easy), FSRS optimizes review intervals, reducing total study time by up to 30% while maintaining a 90%+ target retention rate.
Seamless 2-Way AnkiWeb Cloud Synchronization
Keep your study progress synchronized effortlessly. AnkiDroid connects directly to the free, non-profit AnkiWeb cloud service, synchronizing deck progress, card modifications, scheduling timestamps, and embedded media files seamlessly between your Android phone, desktop computer (Anki for Windows, macOS, Linux), and iOS devices.
Rich Media & Complex Formatting (LaTeX, Audio, Image Occlusion)
AnkiDroid handles complex scientific, mathematical, and linguistic cards with ease:
- LaTeX & MathJax: Renders beautiful mathematical equations, physics formulas, and chemical structures.
- Embedded Audio & TTS: Integrates native text-to-speech (TTS) in over 50+ languages alongside native audio recordings for language pronunciation drills.
- Image Occlusion: Hide specific anatomical labels, diagram captions, or map regions for visual memorization.
⚙️ Key Capabilities & Workflow Features
AnkiDroid provides an exhaustive suite of flashcard creation, study, and analytics tools.
1. Access Thousands of Free Shared Community Decks
Download thousands of pre-made, high-quality community decks covering foreign languages (Japanese Kanji, Spanish, German, Mandarin), medical board exams (USMLE, MCAT, Pharmacology), law, programming, and trivia.
2. Interactive Whiteboard & Handwriting Canvas
Practice writing Chinese Hanzi, Japanese Kanji, mathematical proofs, or anatomical sketches directly on your phone's screen using the integrated Whiteboard Drawing Canvas before flipping the card.
3. Comprehensive Learning Statistics & Study Heatmap
Track your study habits with detailed graphical analytics: review counts, forecast retention rates, card difficulty distributions, and a visual Daily Study Heatmap to keep your learning streak alive.
4. Full E-Ink Screen Optimization & Gesture Navigation
Optimized for e-ink Android readers with high-contrast monochrome themes. Navigate reviews fluidly using custom touch gestures (tapping screen corners) or hardware Bluetooth clickers/gamepads.
📊 Comprehensive Head-to-Head Comparison Matrix
| Evaluation Dimension | AnkiDroid (FileCobra) | Quizlet | Flashcards Deluxe |
|---|---|---|---|
| Target Audience | Medical, Languages, Law, STEM | High School / General | General Learning |
| FSRS Modern Scheduler | Full Native FSRS Support | None | Proprietary Leitner |
| Image Occlusion Tool | Yes (Native Module) | Paid Feature | None |
| Whiteboard Canvas Drawing | Yes (Full Canvas Overlay) | No | Drawing Tool |
| Material 3 Dynamic Monet | Yes (Dynamic Theming) | Proprietary UI | Classic iOS UI |
| License Type | GNU GPLv3 (100% Free FOSS) | Proprietary Commercial | Proprietary Paid |
📋 Technical Hardware & System Requirements
AnkiDroid is lightweight and compatible with all modern Android smartphones, tablets, and e-ink readers:
| Hardware Component | Minimum System Requirement | Recommended Performance Spec |
|---|---|---|
| Operating System | Android 5.0 (Lollipop) or higher | Android 11 / 12 / 13 / 14 / 15 |
| Processor (CPU) | ARMv7 / ARM64 / x86 / x86_64 Processor | Any Modern Mobile Processor |
| System Memory (RAM) | 512 MB RAM | 2 GB+ RAM |
| Storage Space | 25 MB for app + Storage for Decks & Media | High-Speed Internal Storage |
| Display Support | Standard Mobile Display | OLED / AMOLED or E-Ink Screen |
🛠️ Step-by-Step Installation & Quick Setup Guide
Follow this guide to install and master flashcards with AnkiDroid on Android:
1. Downloading and Installing AnkiDroid
- Download the official verified AnkiDroid APK package (
ankidroid-flashcards-v2.18.x.apk) from FileCobra. - Tap the file to complete installation and open AnkiDroid.
2. Syncing with AnkiWeb (Optional)
- Tap the Sync button in the top right corner.
- Log in with your free AnkiWeb credentials to synchronize your decks from PC or Mac.
3. Creating Cards & Studying
- Tap the "+" icon to create a new flashcard or download shared community decks.
- Tap any deck to start studying with spaced repetition rating buttons (Again, Hard, Good, Easy)!
🔒 Security, Privacy & Open-Source Integrity Analysis
AnkiDroid represents the pinnacle of ethical educational software:
- 100% Free & Open Source: Licensed under GNU GPLv3 with full public source code inspection on GitHub.
- Zero Commercial Monetization: Contains zero advertising SDKs, tracking beacons, or paid feature paywalls.
❓ Frequently Asked Questions (FAQ)
Is AnkiDroid compatible with Anki on Windows, Mac, and iOS?
Yes! AnkiDroid syncs seamlessly with desktop Anki and AnkiMobile for iOS via the free AnkiWeb cloud synchronization service.
What is the FSRS algorithm in AnkiDroid?
FSRS (Free Spaced Repetition Scheduler) is a next-generation memorization algorithm that predicts memory retention with greater accuracy than SM-2, reducing study time while maintaining high recall.
Can I study flashcards offline without an internet connection?
Yes! Your complete flashcard collection, images, and audio files are stored locally on your device for 100% offline study.
Key Highlights & Features
- Proven SM-2 Spaced Repetition Algorithm
- Sync Decks Seamlessly with AnkiWeb & Desktop
- Supports MathJax, LaTeX, Audio & Rich Media Cards
- Extensive Statistics, Review Heatmaps & Graphs
- Free & Open Source with Zero Subscription Fees
AnkiDroid UI & Interface Screenshots
How to Install & Verify AnkiDroid
Download the official verified APK file directly to your device.
Enable "Install Unknown Apps" in your Android Settings if prompted.
Tap the downloaded APK notification to install and launch the app.
AnkiDroid Version History & Build Numbers
Every AnkiDroid build FileCobra has mirrored, newest first. Match the build number against the copy you already have to confirm whether you are up to date.
- Latest stable release with FSRS spaced repetition algorithm, AnkiWeb sync, audio playback, and LaTeX math
- Added image occlusion card editor tool
- Fixed card review flip gesture responsiveness
- Enhanced custom card deck styling CSS parser
- Faster collection database vacuum
- Added heat map study statistics widget
- Dark AMOLED theme improvements
- Milestone stable release with full offline flashcard learning system
Related Android APK Software & Alternatives
Frequently Asked Questions & Verification Guide
Is AnkiDroid compatible with Anki on Windows, Mac, and iOS?
Yes! AnkiDroid syncs seamlessly with desktop Anki and AnkiMobile for iOS via the free AnkiWeb cloud synchronization service.
What is the FSRS algorithm in AnkiDroid?
FSRS (Free Spaced Repetition Scheduler) is a next-generation memorization algorithm that predicts memory retention with greater accuracy than SM-2, reducing study time while maintaining high recall.
Can I study flashcards offline without an internet connection?
Yes! Your complete flashcard collection, images, and audio files are stored locally on your device for 100% offline study.