# Phast vs ReactionX

The clearest difference is review sentiment: ReactionX at 100% against Phast's 64%. ReactionX also leads on in-app purchases (none vs 13). Phast's advantage is iOS requirement (12.4 vs 15.1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Phast sells 13 in-app purchases, starting at $0.99 per month. ReactionX asks for nothing beyond the download.

Phast ships an update every 2 months, ReactionX every 6 weeks. The most recent releases landed on October 10, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Phast | ReactionX |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/reactionx/id1515855584/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | 64.3% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 30 MB | 34 MB |
| Requires iOS | **12.4** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Connectiva Tecnologia](https://appshunter.io/developer/1229923709) | [学斌 赵](https://appshunter.io/developer/1514555505) |

## What reviewers say

### Phast

[App page](https://appshunter.io/ios/app/phast/id1229923710)

This platform guides physiotherapists through assessments to identify injury risks in athletes and active individuals. It aids in injury prevention, post-rehabilitation tracking, and helps athletes return to play safely and improve performance.

**Highlights:** Injury risk identification, Athlete performance improvement, Guided assessments, Clinical reasoning organization, Post-rehabilitation tracking, Return to play guidance

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

**In-app purchases (13)**

| Purchase | Price | Billing |
| --- | --- | --- |
| fisioemortopediafree | $0.99 | per month |
| fisioemortopedia50off | $1.99 | per month |
| fisioemortopedia50off | $2.99 | per month |
| Basic | $3.99 | per month |
| marcelaphastvip | $3.99 | per month |
| viniciusphastvip | $3.99 | per month |
| marinaphastvip | $3.99 | per month |
| Vip | $4.99 | per month |
| Plano VIP | $4.99 | per month |
| unitedvip | $4.99 | per 3 months |
| Phast | $4.99 | per year |
| timepeople | $9.99 | per month |
| Phast exos | Free | one-time |


### ReactionX

[App page](https://appshunter.io/ios/app/reactionx/id1515855584)

Enhance your athletic performance with this app, designed to be used with specialized training lamps. Improve your speed and reaction times through professional sports training exercises.

**Highlights:** Professional sports training, Speed improvement, Reaction time enhancement, Compatible with training lamps hardware

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

**In-app purchases:** none


## Frequently asked questions

### Is Phast free?

Phast is free to download, with in-app purchases available.

### Is ReactionX free?

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

### Do Phast or ReactionX have ads?

Neither Phast nor ReactionX shows ads.

### Which is updated more often, Phast or ReactionX?

Phast ships an update every 2 months, and ReactionX every 6 weeks. Most recently, Phast was updated on October 10, 2026 and ReactionX on October 19, 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.*