Your answers and progress are saved in this browser, not synced to a student account. Clearing browser data can remove them. On a shared device, other users may see them.
Microphone access is requested only when you choose Record myself in a language lesson. Your recording is kept in temporary browser memory for local playback and rough sound comparison with this site's sample; it is never uploaded or saved with progress. It is discarded when you leave that practice screen. The included computer-generated language audio loads from this site. Hosting may retain access logs.
This is an online trial, not an offline app. Any local voice-similarity number is not a pronunciation or exam grade. Science short and long answers use a model and checklist for self-review, not automatic marks. Lessons are original learning materials, internally checked but not independently teacher-reviewed.