# Spread Rate Calculator vs HSI Platform

The clearest difference is update cadence: HSI Platform at every 3 months against Spread Rate Calculator's every 59 months. Spread Rate Calculator's advantage is iOS requirement (8.0 vs 17.0). 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.

Spread Rate Calculator ships an update every 59 months, HSI Platform every 3 months. The most recent releases landed on November 2, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Spread Rate Calculator | HSI Platform |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.4 (8 ratings)](https://appshunter.io/ios/app/hsi-platform/id6602404394/reviews)** |
| Number of ratings | — | **8** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 59 months | **Every 3 months** |
| Monetization | — | Free |
| Size | 211 MB | 9 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [BearCat Mfg](https://appshunter.io/developer/1437293606) | [Health & Safety Institute](https://appshunter.io/developer/440276796) |

## What reviewers say

### Spread Rate Calculator

[App page](https://appshunter.io/ios/app/spread-rate-calculator/id1437293607)

**Features:** macOS Compatibility

**In-app purchases:** none


### HSI Platform

[App page](https://appshunter.io/ios/app/hsi-platform/id6602404394)

This platform offers a comprehensive suite of tools for managing EHS, ESG, chemical safety, and workplace training. It provides seamless mobile access to cloud-based solutions, enhancing efficiency for users and employees.

**Highlights:** Incident reporting and investigation, Configurable inspection checklists, Corrective action management, Workplace safety and professional development training, Chemical and SDS management, Real-time EHS reporting and analytics

**In-app purchases:** none


## Frequently asked questions

### Is Spread Rate Calculator free?

Spread Rate Calculator is free to download, with no in-app purchases.

### Is HSI Platform free?

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

### Do Spread Rate Calculator or HSI Platform have ads?

Neither Spread Rate Calculator nor HSI Platform shows ads.

### Which is updated more often, Spread Rate Calculator or HSI Platform?

Spread Rate Calculator ships an update every 59 months, and HSI Platform every 3 months. Most recently, Spread Rate Calculator was updated on November 2, 2026 and HSI Platform on November 8, 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.*