# HP15C: Scientific Calculator — user reviews

> 3 indexed App Store user reviews of HP15C by FERMAVE, rated 2.70/5 from 3 ratings.

- Source: https://appshunter.io/ios/app/hp15c-scientific-calculator/id6741306693/reviews
- App overview in markdown: https://appshunter.io/ios/app/hp15c-scientific-calculator/id6741306693.md
- Rating breakdown: 5★ 1 · 4★ 0 · 3★ 0 · 2★ 1 · 1★ 1

## Most critical reviews (3 lowest-rated)

### 1/5 — Tan -1 does not work

*2025-02-25*

Inverse tangent doesn’t work in degrees

**Developer response:** I fixed this bug, please try again!

### 2/5 — Oops

*2025-03-20*

Inverse Tangent in degrees is still broken.

### 5/5 — Calculator nostalgia

*2025-03-14*

Works great! My son loves it!

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*