# AmiFit vs Marrow

The clearest difference is update cadence: Marrow at every 8 days against AmiFit's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. AmiFit sells 2 in-app purchases, starting at $6.99 per month and Marrow sells 2 in-app purchases, starting at $9.99 per 7 days. Whichever you choose, the download price is not the number that matters.

AmiFit ships an update every 3 weeks, Marrow every 8 days. The most recent releases landed on October 9, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | AmiFit | Marrow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 8 days** |
| Size | 71 MB | 1 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [X10 EAS](https://appshunter.io/developer/1641958326) | [Linh Phan Nhat Khanh](https://appshunter.io/developer/1777727575) |

## What reviewers say

### AmiFit

[App page](https://appshunter.io/ios/app/amifit-micronutrient-tracker/id6761309128)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AmiFit Monthly | $6.99 | per month |
| AmiFit Lifetime | $99.00 | one-time |


### Marrow

[App page](https://appshunter.io/ios/app/marrow-calcium-tracker/id6773758848)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Marrow Bone Health Weekly | $9.99 | per 7 days |
| Marrow Bone Health Yearly | $49.99 | per year |


## Frequently asked questions

### Is AmiFit free?

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

### Is Marrow free?

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

### Do AmiFit or Marrow have ads?

Neither AmiFit nor Marrow shows ads.

### Which is updated more often, AmiFit or Marrow?

AmiFit ships an update every 3 weeks, and Marrow every 8 days. Most recently, AmiFit was updated on October 9, 2026 and Marrow on October 13, 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.*