# Chain Calculator vs KoiNote

The clearest difference is in-app purchases: Chain Calculator at none against KoiNote's 3. Chain Calculator also leads on iOS requirement (13.0 vs 15.5). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. KoiNote sells 3 in-app purchases, starting at $1.99 per month. Chain Calculator asks for nothing beyond the download.

Chain Calculator ships an update monthly, KoiNote every 2 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Chain Calculator | KoiNote |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Size | 18 MB | 40 MB |
| Requires iOS | **13.0** | 15.5 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [seongkuk park](https://appshunter.io/developer/1895828986) | [厦门智伽科技有限公司](https://appshunter.io/developer/1851952936) |

## What reviewers say

### Chain Calculator

[App page](https://appshunter.io/ios/app/chain-calculator/id6764549705)

**In-app purchases:** none


### KoiNote

[App page](https://appshunter.io/ios/app/koinote/id6781148044)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| monthly subscribe | $1.99 | per month |
| vip for a week | $0.99 | one-time |
| 月会员 | $2.99 | one-time |


## Frequently asked questions

### Is Chain Calculator free?

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

### Is KoiNote free?

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

### Do Chain Calculator or KoiNote have ads?

Neither Chain Calculator nor KoiNote shows ads.

### Which is updated more often, Chain Calculator or KoiNote?

Chain Calculator ships an update monthly, and KoiNote every 2 weeks. Most recently, Chain Calculator was updated on October 24, 2026 and KoiNote on October 25, 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.*