# Trio vs Marrow

The clearest difference is in-app purchases: Trio at none against Marrow's 2. Trio also leads on iOS requirement (15.1 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Marrow sells 2 in-app purchases, starting at $9.99 per 7 days. Trio asks for nothing beyond the download.

## The numbers

| Metric | Trio | Marrow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 8 days |
| Size | 38 MB | 1 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Uri Kreindler](https://appshunter.io/developer/1887464502) | [Linh Phan Nhat Khanh](https://appshunter.io/developer/1777727575) |

## What reviewers say

### Trio

[App page](https://appshunter.io/ios/app/trio-nutrient-tracker/id6762437075)

**Features:** Vision Pro support

**In-app purchases:** none


### 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 Trio free?

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

### Is Marrow free?

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

### Do Trio or Marrow have ads?

Neither Trio nor Marrow shows ads.

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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.*