Braintain

Braintain is a flashcard app built on a simple premise: memory holds on to something it can see and hear. Instead of plain text cards, every card in its ready-made 'BrainPods' carries a picture, an example sentence and recorded audio, so a word or concept arrives with several anchors at once. The app is free on iPhone and Android, requires no account to start, and is designed for short daily sessions rather than long cramming blocks.

The study method is straightforward. You see a card, try to recall its meaning before flipping, then rate how it felt — Again, Hard, Good or Easy — and that rating decides when the card returns: tomorrow, or weeks from now. Sessions are kept short, at most around ten cards with reviews first, so spaced repetition does the heavy lifting. Topics range from languages such as German, French and Spanish to science subjects like Physics, Biology, Astronomy and Computer Science, plus practical English like phrasal verbs and idioms, each split into levels.

The optional Premium tier adds Mira, an AI coach that reads your study history. Mira produces a Learning Score, identifies your weak spots, surfaces insights and builds a plan for the day — for example, telling you to review ten Physics cards first. Premium also removes ads. Everything else, including every BrainPod, custom deck creation and spaced-repetition reviews, is free.