Task history
Task history is a Pro-only feature at /history. Your most recent answers from logged-in sessions are kept — quick play, 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.