# PHS vs Prestart Checks

The clearest difference is update cadence: Prestart Checks at every 6 weeks against PHS's every 11 months. PHS's advantage is iOS requirement (8.0 vs 11.4). On price, ads, in-app purchases and monetization model 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, Prestart Checks every 6 weeks. The most recent releases landed on October 23, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | PHS | Prestart Checks |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/phs/id1148768952/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 6 weeks** |
| Monetization | Free | Free |
| Size | 4 MB | 34 MB |
| Requires iOS | **8.0** | 11.4 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kelly Johnstone](https://appshunter.io/developer/1148768951) | [INTELLIFLEET PTY LTD](https://appshunter.io/developer/1694461777) |

## 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


### Prestart Checks

[App page](https://appshunter.io/ios/app/prestart-checks/id6450761335)

Streamline pre-start vehicle inspections with customizable checklists. Ensure compliance, manage critical failures, and track repairs efficiently. Integrates with telematics for comprehensive fleet management.

**Highlights:** Customizable checklists, Chain of Responsibility compliance, Vehicle failure management, Repairer allocation, Repair reporting, Audit export, Telematics integration

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PHS free?

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

### Is Prestart Checks free?

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

### Do PHS or Prestart Checks have ads?

Neither PHS nor Prestart Checks shows ads.

### Which is updated more often, PHS or Prestart Checks?

PHS ships an update every 11 months, and Prestart Checks every 6 weeks. Most recently, PHS was updated on October 23, 2026 and Prestart Checks on October 16, 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.*