# NutrientOS vs Caltopia

The clearest difference is update cadence: Caltopia at every 3 days against NutrientOS's fortnightly. Caltopia also leads on ratings volume (7 vs 1). NutrientOS's advantage is monetization model (free with in-app purchases vs paid) and iOS requirement (15.0 vs 17.0). On price, rating, review sentiment and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for NutrientOS against 5.0 for Caltopia. That said, the two scores are not equally well evidenced: Caltopia has 7 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

NutrientOS ships an update fortnightly, Caltopia every 3 days. The most recent releases landed on September 19, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | NutrientOS | Caltopia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/nutrientos-calorie-tracker/id6765582312/reviews) | [5.0 (7 ratings)](https://appshunter.io/ios/app/caltopia-calorie-tracker/id6769532300/reviews) |
| Number of ratings | 1 | **7** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 3 days** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 22 MB | 10 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 12+ |
| Developer | [Jeremiyah Escobedo](https://appshunter.io/developer/1895999641) | [COLE SHANE WILLIAMS](https://appshunter.io/developer/1896666136) |

## 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 |


### Caltopia

[App page](https://appshunter.io/ios/app/caltopia-calorie-tracker/id6769532300)

This app offers private, offline calorie and macro tracking with an on-device AI coach for personalized insights and recipes. It supports voice logging, intermittent fasting, and GLP-1 tracking, with data securely stored on your device. Import data from other services and export your logs in various formats.

**Highlights:** Offline calorie and macro tracking, On-device AI coach for insights and recipes, Voice logging and nutrition label OCR, Intermittent fasting timer, GLP-1 tracking, Data import from MyFitnessPal, Adaptive calorie and macro targets

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Caltopia Unlock | $9.99 | one-time |


## Frequently asked questions

### Is NutrientOS free?

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

### Is Caltopia free?

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

### Which has better reviews, NutrientOS or Caltopia?

NutrientOS and Caltopia are both rated 5.0 out of 5 on the App Store, from 1 and 7 ratings respectively.

### Do NutrientOS or Caltopia have ads?

Neither NutrientOS nor Caltopia shows ads.

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

NutrientOS ships an update fortnightly, and Caltopia every 3 days. Most recently, NutrientOS was updated on September 19, 2026 and Caltopia on September 21, 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.*