FlashStacksYour flashcards,
on your Home Screen.
FlashStacks turns study cards into beautiful iPhone widgets. Glance at a question, tap to reveal the answer — without ever opening the app.
Studying that fits into the moments already filling your day
Every time you check your phone, there's something new to learn. No app to open, no friction, no excuses.
Home Screen & Lock Screen widgets
Your cards live where you already look dozens of times a day. Cards rotate automatically — tap to reveal, tap to advance. How widgets work →
AI deck generation from PDF
Upload lecture slides or a textbook chapter and AI builds a complete, study-ready deck in seconds. See how it works →
Spaced repetition built in
The same science behind Anki. Cards you struggle with come back sooner; cards you've mastered fade into the background.
Image occlusion cards
Add diagrams, anatomy, or maps and draw boxes over areas to hide. Tap to reveal what's underneath. Learn more →
Beautiful by design
Every stack gets its own colour palette. Widgets match your stack. Dark mode uses pure OLED black.
Streaks & progress tracking
Per-stack mastery stats, difficulty breakdowns, and 14-day activity. Build a streak and hit your daily goal.
Stop making excuses. Start glancing.
Free to download. Premium unlocks AI generation, image occlusion, and Lock Screen widgets — with a 3-day free trial.
Frequently asked questions
Is FlashStacks free?
Yes — download, create stacks, add cards, and study with spaced repetition for free. Premium unlocks AI deck generation from PDF, image occlusion cards, and Lock Screen widgets.
How does the PDF to flashcards feature work?
Choose any PDF — lecture notes, a textbook chapter, a study guide — and AI reads every page, extracts the key concepts, and writes a complete flashcard deck. You review the cards and import the ones you want.
Does it work on the Lock Screen?
Yes. FlashStacks supports Lock Screen widgets, so a study card is the first thing you see when you pick up your phone.
Is it a good alternative to Anki?
FlashStacks uses the same spaced-repetition science as Anki, but adds Home Screen widgets and AI deck creation, with a modern design. See our full Anki comparison.
What languages does FlashStacks support?
English, German, Spanish, French, Italian, Japanese, Korean, Portuguese (Brazil), Russian, and Simplified Chinese.