# JSME計算力学技術者振動２級単語帳 vs Derivon

The clearest difference is price: Derivon at Free against JSME計算力学技術者振動２級単語帳's $2.99. JSME計算力学技術者振動２級単語帳's advantage is in-app purchases (none vs 3) and iOS requirement (13.4 vs 26.0).

Derivon is free to download; JSME計算力学技術者振動２級単語帳 costs $2.99 up front. Derivon sells 3 one-off in-app purchases. JSME計算力学技術者振動２級単語帳 asks for nothing beyond the download.

## The numbers

| Metric | JSME計算力学技術者振動２級単語帳 | Derivon |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[3.0 (1 ratings)](https://appshunter.io/ios/app/derivon-calculus-practice/id6761150220/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | — | Yes |
| Update frequency | — | Every 2 days |
| Monetization | — | Free with in-app purchases |
| Size | 19 MB | 130 MB |
| Requires iOS | **13.4** | 26.0 |
| Devices | — | **iPhone** |
| Age rating | 4+ | 4+ |
| Developer | [Daisuke Matsubara](https://appshunter.io/developer/1720755722) | [RYOMA MIZUTANI](https://appshunter.io/developer/1736955493) |

## What reviewers say

### JSME計算力学技術者振動２級単語帳

[App page](https://appshunter.io/ios/app/jsme/id6480371803)

**In-app purchases:** none


### Derivon

[App page](https://appshunter.io/ios/app/derivon-calculus-practice/id6761150220)

Master calculus concepts like derivatives and integrals through daily, intuitive practice. Earn rewards, collect planets, and build streaks as you progress through challenges. Designed for quick, effective learning sessions.

**Highlights:** Daily calculus problem practice, Earn Star Sand rewards, Collect planets in Gallery, Build and maintain daily streaks, Rank-Up Challenges, Shooting mode for breaks

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 5 Star Fragments | $0.99 | one-time |
| 12 Star Fragments | $1.99 | one-time |
| 32 Star Fragments | $3.99 | one-time |


## Frequently asked questions

### Is JSME計算力学技術者振動２級単語帳 free?

JSME計算力学技術者振動２級単語帳 costs $2.99, with no in-app purchases.

### Is Derivon free?

Derivon is free to download, with in-app purchases available.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*