# Calsay vs NutrientOS

Calsay and NutrientOS are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Calsay sells 2 in-app purchases, starting at $0.99 per year and NutrientOS sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

Calsay ships an update weekly, NutrientOS fortnightly. The most recent releases landed on October 9, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Calsay | NutrientOS |
| --- | --- | --- |
| 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 | **Weekly** | Fortnightly |
| Monetization | — | Free with in-app purchases |
| Size | 46 MB | 22 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Atlantico Intelligence Labs UAB](https://appshunter.io/developer/1792284984) | [Jeremiyah Escobedo](https://appshunter.io/developer/1895999641) |

## What reviewers say

### Calsay

[App page](https://appshunter.io/ios/app/calsay/id6762194270)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Access | $0.99 | per year |
| Calsay Premium | $39.99 | per year |


### 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 |


## Frequently asked questions

### Is Calsay free?

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

### Is NutrientOS free?

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

### Do Calsay or NutrientOS have ads?

Neither Calsay nor NutrientOS shows ads.

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

Calsay ships an update weekly, and NutrientOS fortnightly. Most recently, Calsay was updated on October 9, 2026 and NutrientOS on October 6, 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.*