# Program Heat Stress® vs Pigma Bluebox

The clearest difference is update cadence: Pigma Bluebox at every 3 weeks against Program Heat Stress®'s every 6 months. Program Heat Stress®'s advantage is iOS requirement (8.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

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

Program Heat Stress® ships an update every 6 months, Pigma Bluebox every 3 weeks. The most recent releases landed on September 30, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Program Heat Stress® | Pigma Bluebox |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Size | 5 MB | 45 MB |
| Requires iOS | **8.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SOCIETE INDUSTRIELLE LESAFFRE](https://appshunter.io/developer/1284863866) | [Pigma Desenvolvimentos LTDA](https://appshunter.io/developer/1770061969) |

## What reviewers say

### Program Heat Stress®

[App page](https://appshunter.io/ios/app/program-heat-stress/id993601879)

**Features:** macOS Compatibility

**In-app purchases:** none


### Pigma Bluebox

[App page](https://appshunter.io/ios/app/pigma-bluebox/id6753698852)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Program Heat Stress® free?

Program Heat Stress® is free to download, with no in-app purchases.

### Is Pigma Bluebox free?

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

### Do Program Heat Stress® or Pigma Bluebox have ads?

Neither Program Heat Stress® nor Pigma Bluebox shows ads.

### Which is updated more often, Program Heat Stress® or Pigma Bluebox?

Program Heat Stress® ships an update every 6 months, and Pigma Bluebox every 3 weeks. Most recently, Program Heat Stress® was updated on September 30, 2026 and Pigma Bluebox on October 3, 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.*