# FAST vs REAC/TS

The clearest difference is rating: REAC/TS at 5.0 against FAST's 4.3. REAC/TS also leads on update cadence (every 3 months vs every 7 months). FAST's advantage is iOS requirement (12.1 vs 16.0). On price, ratings volume, 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.

REAC/TS holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 3 and 4 respectively.

FAST ships an update every 7 months, REAC/TS every 3 months. Both last shipped on October 4, 2026.

## The numbers

| Metric | FAST | REAC/TS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (3 ratings)](https://appshunter.io/ios/app/fast-act/id1446010360/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/reacts/id1472260982/reviews)** |
| Number of ratings | 3 | **4** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 22 MB | 62 MB |
| Requires iOS | **12.1** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Timilon Technology Acquisitions LLC](https://appshunter.io/developer/1446010359) | [ORAU](https://appshunter.io/developer/630626943) |

## What reviewers say

### FAST

[App page](https://appshunter.io/ios/app/fast-act/id1446010360)

This app serves as a guide for HAZMAT professionals on how a specific decontamination agent interacts with and neutralizes various chemicals. It features a comprehensive chemical threat index, detailing efficacy on vapor releases and contaminated surfaces, with search and sort functionalities.

**Highlights:** Extensive chemical threat index, FAST-ACT efficacy details, Vapor release decontamination, Contaminated surface decontamination, Search by Chemical Name, Sort by CAS Number

**Features:** macOS Compatibility

**In-app purchases:** none


### REAC/TS

[App page](https://appshunter.io/ios/app/reacts/id1472260982)

This app provides essential information for the medical management of individuals exposed to radiation or radioactive materials. It serves as a valuable resource for healthcare professionals and emergency responders dealing with radiation-related emergencies.

**Highlights:** Medical management of radiation exposure, Emergency response resources, Information for healthcare professionals, Guidance for public health agencies, 24/7 contact information

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is FAST free?

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

### Is REAC/TS free?

REAC/TS is free to download, with no in-app purchases.

### Which has better reviews, FAST or REAC/TS?

REAC/TS is rated higher. FAST averages 4.3 out of 5 from 3 ratings, while REAC/TS averages 5.0 from 4 ratings.

### Do FAST or REAC/TS have ads?

Neither FAST nor REAC/TS shows ads.

### Which is updated more often, FAST or REAC/TS?

FAST ships an update every 7 months, and REAC/TS every 3 months. Most recently, FAST was updated on October 4, 2026 and REAC/TS on October 4, 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.*