# Chessbook - Master openings

> Taken from the public Google Play listing. Every figure below carries the date it was updated.
> Nothing is modelled or estimated. A new collection starts at 00:00 UTC daily and takes several hours; an individual app's reading lands at some point inside that window.

Source page: https://appcurves.com/app/chessbook

- Package: `com.chessbook.android`
- Developer: Chessbook
- Category: Education
- Platform: Android (Google Play)
- Released: Dec 7, 2023
- Lifetime downloads: 203,777 (updated 2026-08-18)
- What the store shows instead: 100,000+
- Rating: 4.79 from 5,140 ratings
- Downloads added: 843 across 2 days (2026-08-16 → 2026-08-18; a reading is missing in between)
- Readings kept: 7 (2026-08-05 → 2026-08-18)

### Latest readings

| Date (UTC) | Lifetime downloads | Added |
|---|---:|---:|
| 2026-08-05 | 200,793 | — |
| 2026-08-06 | 200,793 | held |
| 2026-08-07 | 200,982 | +189 |
| 2026-08-09 | 201,570 | +588 over 2 days |
| 2026-08-15 | 202,729 | +1,159 over 6 days |
| 2026-08-16 | 202,934 | +205 |
| 2026-08-18 | 203,777 | +843 over 2 days |

"held" means Google's own counter showed the same figure as the day before — it is a real reading, not a missed one. A multi-day "Added" spans two real readings; the days between were not read.

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Site last completed a reading on 2026-09-22. AppCurves is not real-time.
When citing, include the reading date. https://appcurves.com/faq answers where the figure comes from.