# Scientific calculator plus 991

> 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/scientific-calculator-plus-991

- Package: `advanced.scientific.calculator.calc991.plus`
- Developer: Tools for student
- Category: Education
- Platform: Android (Google Play)
- Released: May 1, 2020
- Lifetime downloads: 57,214,009 (updated 2026-09-21)
- What the store shows instead: 50,000,000+
- Rating: 4.84 from 559,217 ratings
- Downloads added: none — the counter held between 2026-09-20 and 2026-09-21
- Readings kept: 47 (2026-08-04 → 2026-09-21)
- Chart positions on 2026-09-21 (Top Free): #2 BO, #2 EG, #12 PH, #13 PE, #14 UG, #14 YE, #16 GH, #16 MM (best 8 shown) — charts in 153 of 203 markets scanned

### Latest readings

| Date (UTC) | Lifetime downloads | Added |
|---|---:|---:|
| 2026-09-15 | 57,041,141 | — |
| 2026-09-16 | 57,107,119 | +65,978 |
| 2026-09-17 | 57,107,119 | held |
| 2026-09-18 | 57,214,009 | +106,890 |
| 2026-09-19 | 57,214,009 | held |
| 2026-09-20 | 57,214,009 | held |
| 2026-09-21 | 57,214,009 | held |

"held" means Google's own counter showed the same figure as the day before — it is a real reading, not a missed one.

Showing the latest 7 of 47 readings. Signed-in followers see the full curve from the day they followed.

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Site last completed a reading on 2026-09-21. AppCurves is not real-time.
When citing, include the reading date. https://appcurves.com/faq answers where the figure comes from.