# 無機化学 vs 逆算勉強

The clearest difference is iOS requirement: 逆算勉強 at 11.0 against 無機化学's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

無機化学 ships an update every 2 days, 逆算勉強 daily. The most recent releases landed on October 25, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | 無機化学 | 逆算勉強 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/id1351078183/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 98.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 days | **Daily** |
| Size | 40 MB | 51 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hideki Touhara](https://appshunter.io/developer/1268738829) | [Kodai Maki](https://appshunter.io/developer/1674346013) |

## What reviewers say

### 無機化学

[App page](https://appshunter.io/ios/app/id1351078183)

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

**In-app purchases:** none


### 逆算勉強

[App page](https://appshunter.io/ios/app/id6445865041)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 無機化学 free?

無機化学 is free to download, with no in-app purchases.

### Is 逆算勉強 free?

逆算勉強 is free to download, with no in-app purchases.

### Do 無機化学 or 逆算勉強 have ads?

Neither 無機化学 nor 逆算勉強 shows ads.

### Which is updated more often, 無機化学 or 逆算勉強?

無機化学 ships an update every 2 days, and 逆算勉強 daily. Most recently, 無機化学 was updated on October 25, 2026 and 逆算勉強 on October 14, 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.*