# Reaction Lab vs Reflex Trainer

The clearest difference is in-app purchases: Reflex Trainer at none against Reaction Lab's 2. Reflex Trainer also leads on update cadence (every 5 days vs every 7 months) and device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Reaction Lab sells 2 in-app purchases, starting at $1.99 per month. Reflex Trainer asks for nothing beyond the download.

Reaction Lab ships an update every 7 months, Reflex Trainer every 5 days. Both last shipped on October 12, 2026.

## The numbers

| Metric | Reaction Lab | Reflex Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/reaction-lab-reflex-tests/id6757831974/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 22 MB | 7 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Anthony Harvey](https://appshunter.io/developer/1478197285) | [Max Szolcek](https://appshunter.io/developer/1877740843) |

## What reviewers say

### Reaction Lab

[App page](https://appshunter.io/ios/app/reaction-lab-reflex-tests/id6757831974)

Measure and improve your response speed with a suite of scientifically-inspired tests. Track progress over time with detailed analytics and gain insights into your performance in various situations. Designed for focus and privacy, all data stays on your device.

**Highlights:** Multiple reaction time test types, Visual, audio, and haptic cues, Grip-release and motion-based tests, Dual-task and fatigue tracking, Detailed session summaries and trend charts, On-device data privacy, Offline functionality

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| React Fast Monthly | $1.99 | per month |
| React Fast Yearly | $4.99 | per year |


### Reflex Trainer

[App page](https://appshunter.io/ios/app/reflex-trainer/id6759266350)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Reaction Lab free?

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

### Is Reflex Trainer free?

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

### Do Reaction Lab or Reflex Trainer have ads?

Neither Reaction Lab nor Reflex Trainer shows ads.

### Which is updated more often, Reaction Lab or Reflex Trainer?

Reaction Lab ships an update every 7 months, and Reflex Trainer every 5 days. Most recently, Reaction Lab was updated on October 12, 2026 and Reflex Trainer on October 12, 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.*