# 無機化学 vs blnk

The clearest difference is in-app purchases: blnk at none against 無機化学's 3. blnk also leads on update cadence (every 10 days vs every 2 months) and iOS requirement (13.0 vs 26.0). 無機化学's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. 無機化学 sells 3 in-app purchases, starting at $1.99 per month. blnk asks for nothing beyond the download.

無機化学 ships an update every 2 months, blnk every 10 days. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 無機化学 | blnk |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 86.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | Freemium | — |
| Size | 8 MB | 6 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Akihiko Kitamura](https://appshunter.io/developer/1585792497) | [SATOSHI KIMURA](https://appshunter.io/developer/6792411536) |

## What reviewers say

### 無機化学

[App page](https://appshunter.io/ios/app/id6737172145)

This app helps high school students memorize inorganic chemistry concepts. It covers reaction principles, metallic elements, and non-metallic elements, utilizing a red-sheet overlay for easy output and review. User feedback is actively incorporated for improvements.

**Highlights:** Red sheet overlay for output practice, Comprehensive inorganic chemistry content, Covers reaction principles, Covers metallic elements, Covers non-metallic elements, User feedback integration

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro - 1ヶ月 | $1.99 | per month |
| Pro - 6ヶ月 | $11.99 | per 6 months |
| Pro - 12ヶ月 | $19.99 | per year |


### blnk

[App page](https://appshunter.io/ios/app/blnk/id6792411534)

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

**In-app purchases:** none


## Frequently asked questions

### Is 無機化学 free?

無機化学 is free to download, with in-app purchases available.

### Is blnk free?

blnk is free to download, with no in-app purchases.

### Do 無機化学 or blnk have ads?

blnk shows ads; 無機化学 does not.

### Which is updated more often, 無機化学 or blnk?

無機化学 ships an update every 2 months, and blnk every 10 days. Most recently, 無機化学 was updated on November 4, 2026 and blnk on October 31, 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.*