What Deftly does
Adaptive practice
Miss a concept and a related question comes back — not the same one repeated. Difficulty follows what you have actually demonstrated.
A path built for you
A short readiness check places you where you actually are, so you are not re-learning what you already know.
Spaced repetition
Concepts return at the moment they are about to fade, scheduled by a published algorithm rather than a fixed calendar.
Super Levels
Each unit closes with a mixed retention test drawn from everything you covered in it.
Honest progress
Mastery counts concepts held across formats and across days — not questions answered right once.
Works offline
Everything runs on your device. No account required, no connection needed to study.
Certifications
More professional certifications are in development.
Try it free
The first level of each of the first three units is open on every certification — no account, no card. Unlock the full path when you are ready: a one-time purchase, with no subscription and nothing to renew.