# mchain vs B

The clearest difference is update cadence: B at every 4 days against mchain's fortnightly. B also leads on iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

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

mchain ships an update fortnightly, B every 4 days. The most recent releases landed on September 30, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | mchain | B |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Size | 136 MB | 31 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [m2cloud Inc](https://appshunter.io/developer/1566484064) | [IN&OUT Co.,Ltd.](https://appshunter.io/developer/6783921917) |

## What reviewers say

### mchain

[App page](https://appshunter.io/ios/app/mchain/id6740797123)

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

**In-app purchases:** none


### B

[App page](https://appshunter.io/ios/app/b-sync/id6783921705)

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

**In-app purchases:** none


## Frequently asked questions

### Is mchain free?

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

### Is B free?

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

### Do mchain or B have ads?

Neither mchain nor B shows ads.

### Which is updated more often, mchain or B?

mchain ships an update fortnightly, and B every 4 days. Most recently, mchain was updated on September 30, 2026 and B on September 15, 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.*