Now on web & iOS · Spaced repetition

Master anything,
one card at a time.

Dex turns what you're learning into smart flashcards, then uses spaced repetition to surface each one right before you'd forget it. Study in your browser or on your phone — your decks sync everywhere.

Backed by the science of memory Web & mobile, always in sync
12 cards mastered today
28-day streak
DEX
Welcome back!
Spaced repetition
Folder
Spanish Basics
15 cards waiting for review
Practice now
Activity
What's inside

Everything you need to make it stick.

Practice

Flip cards term to definition, grade yourself honestly, and watch your "known" pile grow. A quiet, tactile study loop with no clutter.

Spaced repetition

Dex schedules each card for the moment you're about to forget it — so a few minutes a day is enough to hold onto everything.

Import & AI scan

Paste a list, drop in your notes, or scan a page — Dex turns it into a clean deck of cards in seconds. No tedious typing.

Activity

A daily heatmap that rewards showing up. Build a streak, see your weeks fill in with teal, and keep the habit honest.

How it works

Three steps to recall.

Build a deck

Import text, paste a list, or scan your notes. Pick a source and target language, or just term and definition.

Practice & flip

Tap to reveal the answer, mark it known or still-learning. The session adapts to what you find hard.

Let Dex schedule it

Spaced repetition brings each card back at the perfect interval. Show up daily and recall takes care of itself.

Try it

Tap the card.
Feel the flip.

This is the exact card from the Dex app — a real 3D flip from term to answer. Swipe right if you've got it, left if you're still learning, or use the buttons below.

● 0 got it  ·  ● 0 learning  ·  Space to flip · ←/→ to grade

Learning
Got it!
Term

Photosynthesis

Tap to flip
Definition

How plants turn light into energy

Tap to flip back
How Dex compares

The same idea, without the baggage.

Anki and Quizlet have shaped how the world studies with flashcards. But somewhere along the way they got expensive, fiddly, and cluttered. Dex keeps what works and quietly drops the rest.

Quizlet
Busy by design
  • A pile of game-show modes — and yet no real spaced-repetition scheduler.
  • The genuinely useful, memory-science learning tools? Locked behind a paywall.
  • Built around crowdsourced sets — and the mistakes baked into them.
Built for cramming
Anki
Powerful — if you survive it
  • Free on desktop and Android, but the iPhone app is a one-time ~$25.
  • A brutal learning curve and an interface that feels stuck in 2010.
  • No built-in AI — every card is typed by hand, one at a time.
~$25 on iOS
Dex
Calm. Free. Modern.
  • Free on iPhone, Android and the web — no platform tax, ever.
  • FSRS spaced repetition, on by default. Nothing to configure.
  • Snap a photo or drop a PDF — AI builds the deck for you.
  • One clean flip. No ads, no coins, no game-show modes.
Free · Every device

Competitor pricing and features as of 2026. Dex stays free to start on every platform.

Start mastering
anything today.

Free to start, on the web and in your pocket. Build your first deck in two minutes — no credit card, no clutter.