Why This Works.
Flashcards aren't new. But most people use them wrong. Parallax uses an algorithm to show you cards at the right time, so you actually remember them.
The Problem
Without review, you forget most of what you study. This is called the "forgetting curve" and it's brutal:
- 50% gone within an hour
- 70% gone by tomorrow
- 90% gone within a week
The good news? If you review at the right times, you can beat this. That's what spaced repetition is all about.
The Solution
Cramming
Feels productive, but most of it's gone by next week. You waste time reviewing stuff you know while forgetting stuff you don't.
Spaced Repetition
Review each card right before you'd forget it. Hard cards come back sooner. Easy cards can wait weeks or months.
The Algorithm
Parallax uses FSRS (Free Spaced Repetition Scheduler). It was trained on millions of real study sessions and adapts to how you personally learn.
How It Works
Review a card
Try to remember the answer, then rate yourself: forgot, struggled, got it, or easy.
Algorithm updates
Based on your rating, FSRS calculates how strong your memory is for that card.
Next review scheduled
The card comes back right before you'd forget it. Not too soon, not too late.
Repeat
Over time, cards you know well get pushed out to weeks or months. Hard cards stay frequent.
Parallax Features
Smart Scheduling
FSRS adjusts to your pace. Harder cards show up more often, easier cards less.
AI Card Creation
Type a word, get a complete card with translations and examples. Takes seconds.
Progress Tracking
Cards go from "New" to "Mastered" based on actual retention, not streaks.
Learn More
Try It Out
Create a free account and make your first card. Takes about 30 seconds.