# あかほん！ プロトタイプA vs Derivon

The clearest difference is rating: あかほん！ プロトタイプA at 5.0 against Derivon's 3.0. あかほん！ プロトタイプA also leads on in-app purchases (none vs 3) and ads (none vs shown). Derivon's advantage is update cadence (every 4 days vs every 4 weeks). On price and ratings volume there is nothing between them.

Both are free to download. Derivon sells 3 one-off in-app purchases. あかほん！ プロトタイプA asks for nothing beyond the download.

あかほん！ プロトタイプA holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

あかほん！ プロトタイプA ships an update every 4 weeks, Derivon every 4 days. The most recent releases landed on October 8, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | あかほん！ プロトタイプA | Derivon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/a/id1438322285/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/derivon-calculus-practice/id6761150220/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 weeks | **Every 4 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 88 MB | 182 MB |
| Requires iOS | **7.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Nobumitsu Shikine](https://appshunter.io/developer/1361521847) | [ABT合同会社](https://appshunter.io/developer/6813846553) |

## What reviewers say

### あかほん！ プロトタイプA

[App page](https://appshunter.io/ios/app/a/id1438322285)

This app uses a unique story-driven approach to help users learn calculus concepts like differentiation. Follow characters through engaging dialogues that explain complex math topics at your own pace.

**Highlights:** Story-driven learning, Interactive dialogues, Calculus concepts (differentiation), Character-based guidance, NOVELICA system, Self-paced learning

**Features:** macOS Compatibility

**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 あかほん！ プロトタイプA free?

あかほん！ プロトタイプA is free to download, with no in-app purchases.

### Is Derivon free?

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

### Which has better reviews, あかほん！ プロトタイプA or Derivon?

あかほん！ プロトタイプA is rated higher. あかほん！ プロトタイプA averages 5.0 out of 5 from 1 ratings, while Derivon averages 3.0 from 1 ratings.

### Do あかほん！ プロトタイプA or Derivon have ads?

Derivon shows ads; あかほん！ プロトタイプA does not.

### Which is updated more often, あかほん！ プロトタイプA or Derivon?

あかほん！ プロトタイプA ships an update every 4 weeks, and Derivon every 4 days. Most recently, あかほん！ プロトタイプA was updated on October 8, 2026 and Derivon on October 7, 2026.

---

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