Learn anything.
Actually remember it.
Atlas is a calm, almanac-style workspace for the cards you build – saved, sorted, and reviewed at exactly the right moment.
Free forever for up to 500 cards · No credit card required
Area of a triangle
½ × base × height
Half the base times the height – the enclosing rectangle, cut in two.
Start from a ready-made collection.
Try any collection right now – no account needed.
Phrasal verbs by particle
Everyday two-word phrasal verbs, grouped by the particle that shapes their meaning.
Everyday idioms
The idioms native speakers use most in conversation, with where they come from when it helps.
Spaced repetition
A scheduler that surfaces each card exactly when you’re about to forget it.
Any subject
Dates, formulas, concepts – a front, a back, and your own notes. If it fits on a card, Atlas can teach it.
Your own collections
Group cards by theme or source and review any set on its own – or start from a ready-made collection in the catalog.