# Derivon vs SPavoid 〜ポモドーロタイマー・休日チャイム時間割〜

The clearest difference is in-app purchases: SPavoid 〜ポモドーロタイマー・休日チャイム時間割〜 at none against Derivon's 3. SPavoid 〜ポモドーロタイマー・休日チャイム時間割〜 also leads on iOS requirement (15.0 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Derivon sells 3 one-off in-app purchases. SPavoid 〜ポモドーロタイマー・休日チャイム時間割〜 asks for nothing beyond the download.

Derivon ships an update every 4 days, SPavoid 〜ポモドーロタイマー・休日チャイム時間割〜 every 5 days. The most recent releases landed on October 7, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Derivon | SPavoid 〜ポモドーロタイマー・休日チャイム時間割〜 |
| --- | --- | --- |
| Price | Free | 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 | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 4 days** | Every 5 days |
| Monetization | Free with in-app purchases | — |
| Size | 182 MB | 56 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ABT合同会社](https://appshunter.io/developer/6813846553) | [Kasanimaro](https://appshunter.io/developer/1846987954) |

## What reviewers say

### 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 |


### SPavoid 〜ポモドーロタイマー・休日チャイム時間割〜

[App page](https://appshunter.io/ios/app/spavoid/id6800185971)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Derivon free?

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

### Is SPavoid 〜ポモドーロタイマー・休日チャイム時間割〜 free?

SPavoid 〜ポモドーロタイマー・休日チャイム時間割〜 is free to download, with no in-app purchases.

### Do Derivon or SPavoid 〜ポモドーロタイマー・休日チャイム時間割〜 have ads?

Both Derivon and SPavoid 〜ポモドーロタイマー・休日チャイム時間割〜 show ads.

### Which is updated more often, Derivon or SPavoid 〜ポモドーロタイマー・休日チャイム時間割〜?

Derivon ships an update every 4 days, and SPavoid 〜ポモドーロタイマー・休日チャイム時間割〜 every 5 days. Most recently, Derivon was updated on October 7, 2026 and SPavoid 〜ポモドーロタイマー・休日チャイム時間割〜 on October 10, 2026.

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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.*