Task history
Task history is a Pro-only feature at /history. Your most recent answers from logged-in sessions are kept — training, ranked, daily, duel and exam.
Data retention
To keep the app fast and affordable, we store the latest 250 answers per account (newest first). Older rows are removed automatically — skill stats, XP, rating and achievements are kept.
| Parameter | Value |
|---|---|
| Answers in history | 250 most recent |
| Problem text older than 21 days | removed (metadata kept) |
| AI explanations | only for answers still in history |
Full stats on /stats and your profile use aggregated data — they are not lost when history is trimmed.
What you can do
- Browse all past answers with pagination (Load more).
- Filter by result (correct / wrong), skill and game mode.
- See the problem text, your answer, the correct answer and response time.
AI explanations for mistakes
On wrong answers, tap Explain with AI. The coach avatar explains:
- Why it was wrong
- Step-by-step solution
- A short practice tip
Each explanation is cached and persistent — once generated it stays available on every future visit and never triggers a second model call. Math in explanations is rendered with clean typographic notation (√, ², ×, ÷).
Limits
| Parameter | Value |
|---|---|
| Fresh explanations per hour | 10 |
Cached explanations do not count toward the limit.
Privacy
Only your own answers are visible. Explanation requests send problem data to the AI server-side — never your email or username.
Related
- Holistic coaching report: AI Coach.