# NutrientOS vs Mark

The clearest difference is update cadence: Mark at every 5 days against NutrientOS's fortnightly. NutrientOS's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. NutrientOS sells 2 in-app purchases, starting at $7.99 per month and Mark sells 1 in-app purchase, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

NutrientOS ships an update fortnightly, Mark every 5 days. The most recent releases landed on October 6, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | NutrientOS | Mark |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nutrientos-calorie-tracker/id6765582312/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 22 MB | 10 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Jeremiyah Escobedo](https://appshunter.io/developer/1895999641) | [Mark-1 Performance LLC](https://appshunter.io/developer/6808754741) |

## What reviewers say

### NutrientOS

[App page](https://appshunter.io/ios/app/nutrientos-calorie-tracker/id6765582312)

Track your nutrition, understand your meals, and build healthier habits with food logging, macro and micronutrient tracking, and workout logging. Optional AI tools offer advanced guidance and insights for personalized wellness.

**Highlights:** Food diary with calories, macros, and micronutrients, Barcode and food search, Restaurant menu browsing, Fitness, hydration, and sleep tracking, AI meal scan, AI Coach for guidance, AI recipe builder

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Atlas Pro Monthly | $7.99 | per month |
| Atlas Premium Monthly | $12.99 | per month |


### Mark

[App page](https://appshunter.io/ios/app/mark-1-workout-journal/id6808754739)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mark-1 Premium | $4.99 | per month |


## Frequently asked questions

### Is NutrientOS free?

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

### Is Mark free?

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

### Do NutrientOS or Mark have ads?

Neither NutrientOS nor Mark shows ads.

### Which is updated more often, NutrientOS or Mark?

NutrientOS ships an update fortnightly, and Mark every 5 days. Most recently, NutrientOS was updated on October 6, 2026 and Mark on October 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.*