# Smart Trainer app vs Reaction Lab

The clearest difference is update cadence: Smart Trainer app at every 3 weeks against Reaction Lab's every 7 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Smart Trainer app sells 1 one-off in-app purchase and Reaction Lab sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Smart Trainer app ships an update every 3 weeks, Reaction Lab every 7 months. The most recent releases landed on October 7, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Smart Trainer app | Reaction Lab |
| --- | --- | --- |
| 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 | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 7 months |
| Monetization | — | Free with in-app purchases |
| Size | 10 MB | 22 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sandris Radzins](https://appshunter.io/developer/1821254962) | [Anthony Harvey](https://appshunter.io/developer/1478197285) |

## What reviewers say

### Smart Trainer app

[App page](https://appshunter.io/ios/app/smart-trainer-app/id6747401793)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version Access | $3.99 | one-time |


### 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 |


## Frequently asked questions

### Is Smart Trainer app free?

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

### Is Reaction Lab free?

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

### Do Smart Trainer app or Reaction Lab have ads?

Neither Smart Trainer app nor Reaction Lab shows ads.

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

Smart Trainer app ships an update every 3 weeks, and Reaction Lab every 7 months. Most recently, Smart Trainer app was updated on October 7, 2026 and Reaction Lab 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.*