# Derivon - Calculus Practice — user reviews

> 1 indexed App Store user reviews of Derivon by RYOMA MIZUTANI, rated 3.00/5 from 1 ratings.

- Source: https://appshunter.io/ios/app/derivon-calculus-practice/id6761150220/reviews
- App overview in markdown: https://appshunter.io/ios/app/derivon-calculus-practice/id6761150220.md
- Rating breakdown: 5★ 0 · 4★ 0 · 3★ 1 · 2★ 0 · 1★ 0

## Most critical reviews (1 lowest-rated)

### 3/5 — Good app but can’t change language

*2026-07-02*

The exercise is nice but I’m stuck at using Japanese

**Developer response:** Thanks for playing! Some screens were still in Japanese — fixed in the update coming out now. It'll be fully English soon.

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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 2026-08-13.*