# Protein Calculator vs Rett

The clearest difference is in-app purchases: Rett at none against Protein Calculator's 2. Rett also leads on iOS requirement (15.1 vs 17.0). Protein Calculator's advantage is update cadence (every 2 days vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Protein Calculator sells 2 in-app purchases, starting at $4.99 per month. Rett asks for nothing beyond the download.

Protein Calculator ships an update every 2 days, Rett every 3 months. The most recent releases landed on November 5, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Protein Calculator | Rett |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 3 months |
| Size | 71 MB | 52 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, Apple Watch | iPhone, iPod |
| Age rating | 12+ | 12+ |
| Developer | [Serkan Kaplan](https://appshunter.io/developer/6780546004) | [RETT SENDROMLU AILELER YARDIMLASMA VE DAYANISMA DERNEGI](https://appshunter.io/developer/6795479368) |

## What reviewers say

### Protein Calculator

[App page](https://appshunter.io/ios/app/protein-calculator-gram/id6787537644)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GRAM Premium Monthly | $4.99 | per month |
| GRAM Premium Yearly | $29.99 | per year |


### Rett

[App page](https://appshunter.io/ios/app/rett/id6795479366)

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

**In-app purchases:** none


## Frequently asked questions

### Is Protein Calculator free?

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

### Is Rett free?

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

### Do Protein Calculator or Rett have ads?

Neither Protein Calculator nor Rett shows ads.

### Which is updated more often, Protein Calculator or Rett?

Protein Calculator ships an update every 2 days, and Rett every 3 months. Most recently, Protein Calculator was updated on November 5, 2026 and Rett on November 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.*