# Carbon Performance Gym vs StackMate

The clearest difference is update cadence: StackMate at weekly against Carbon Performance Gym's every 6 weeks. Carbon Performance Gym's advantage is device support (4 vs 1) and iOS requirement (15.5 vs 18.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Carbon Performance Gym ships an update every 6 weeks, StackMate weekly. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Carbon Performance Gym | StackMate |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Weekly** |
| Size | 198 MB | 22 MB |
| Requires iOS | **15.5** | 18.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Carbon Culture LLC](https://appshunter.io/developer/1710809089) | [Dylan Capshaw](https://appshunter.io/developer/1598884245) |

## What reviewers say

### Carbon Performance Gym

[App page](https://appshunter.io/ios/app/carbon-performance-gym/id6741082773)

**Features:** Apple Wallet

**In-app purchases:** none


### StackMate

[App page](https://appshunter.io/ios/app/stackmate-peptide-tracker/id6812939154)

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

**In-app purchases:** none


## Frequently asked questions

### Is Carbon Performance Gym free?

Carbon Performance Gym is free to download, with no in-app purchases.

### Is StackMate free?

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

### Do Carbon Performance Gym or StackMate have ads?

Neither Carbon Performance Gym nor StackMate shows ads.

### Which is updated more often, Carbon Performance Gym or StackMate?

Carbon Performance Gym ships an update every 6 weeks, and StackMate weekly. Most recently, Carbon Performance Gym was updated on November 4, 2026 and StackMate on October 31, 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.*