# PHS vs AxisStream Mobile

The clearest difference is update cadence: AxisStream Mobile at fortnightly against PHS's every 11 months. PHS's advantage is iOS requirement (8.0 vs 15.0). 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.

PHS ships an update every 11 months, AxisStream Mobile fortnightly. Both last shipped on September 18, 2026.

## The numbers

| Metric | PHS | AxisStream Mobile |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/phs/id1148768952/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 4 MB | 68 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kelly Johnstone](https://appshunter.io/developer/1148768951) | [AxisTech](https://appshunter.io/developer/1650171440) |

## What reviewers say

### PHS

[App page](https://appshunter.io/ios/app/phs/id1148768952)

This app analyzes and interprets thermal risk by calculating predicted heat strain based on user-entered data and ISO 7933:2004 formulas. It offers graphical illustrations and summaries to help manage thermal risks associated with tasks or environments.

**Highlights:** Thermal risk analysis, Predicted heat strain calculations, ISO 7933:2004 formula application, Graphical illustration of heat strain, Thermal risk management guidance

**Features:** macOS Compatibility

**In-app purchases:** none


### AxisStream Mobile

[App page](https://appshunter.io/ios/app/axisstream-mobile/id6443871399)

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

**In-app purchases:** none


## Frequently asked questions

### Is PHS free?

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

### Is AxisStream Mobile free?

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

### Do PHS or AxisStream Mobile have ads?

Neither PHS nor AxisStream Mobile shows ads.

### Which is updated more often, PHS or AxisStream Mobile?

PHS ships an update every 11 months, and AxisStream Mobile fortnightly. Most recently, PHS was updated on September 18, 2026 and AxisStream Mobile on September 18, 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.*