One tap writes you a set of exercises, marks them honestly, and aims the next session at whatever you actually keep getting wrong. No account, no backend — everything stays on your device.
Needs your own OpenRouter key. Try Mock mode in Settings to look around without one.
Every error is tagged from a fixed list — adjectiveEndings,
wechselpraeposition, konjunktiv2. Anything the
model invents is discarded. That's what makes mistakes from different
sessions add up instead of fragmenting into labels that never match.
Exercises carry a cost, and a session spends a budget rather than counting items. Weak at writing? You get one essay instead of ten drills — and the errors it exposes become the next few sessions' drilling.
Long writing is scored against the four exam criteria. The marker is told to err on the harsh side, because encouraging feedback teaches you nothing.
Paste what your teacher told you. It's mapped onto the same catalogue, weighted up for the next few sessions, and you can practise it right away.