# Reaction Timer Training vs Interval Randomizer

The clearest difference is in-app purchases: Interval Randomizer at none against Reaction Timer Training's 1. Interval Randomizer also leads on ads (none vs shown) and update cadence (monthly vs every 3 months). Reaction Timer Training's advantage is device support (4 vs 2) and iOS requirement (15.0 vs 18.2). On price there is nothing between them.

Both are free to download. Reaction Timer Training sells 1 in-app purchase, starting at $1.99 per month. Interval Randomizer asks for nothing beyond the download.

Reaction Timer Training ships an update every 3 months, Interval Randomizer monthly. The most recent releases landed on October 5, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Reaction Timer Training | Interval Randomizer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.3 (4 ratings)](https://appshunter.io/ios/app/reaction-timer-training/id1512744673/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 35 MB | 6 MB |
| Requires iOS | **15.0** | 18.2 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [MillionTask, Unipessoal, Lda](https://appshunter.io/developer/1512744672) | [Hitfire Production AB](https://appshunter.io/developer/1517601288) |

## What reviewers say

### Reaction Timer Training

[App page](https://appshunter.io/ios/app/reaction-timer-training/id1512744673)

Enhance your cognitive and physical performance with this reaction training app. Improve reaction time, decision-making, and coordination using customizable drills and Apple Watch integration. Track progress and sync data with the Health app.

**Highlights:** Improve reaction time, Enhance decision time, Develop peripheral vision, Boost coordination and speed, Customizable training drills, Apple Watch integration, Health app sync

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Auto Renewable Subs | $1.99 | per month |


### Interval Randomizer

[App page](https://appshunter.io/ios/app/interval-randomizer-hiit/id6742220783)

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

**In-app purchases:** none


## Frequently asked questions

### Is Reaction Timer Training free?

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

### Is Interval Randomizer free?

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

### Do Reaction Timer Training or Interval Randomizer have ads?

Reaction Timer Training shows ads; Interval Randomizer does not.

### Which is updated more often, Reaction Timer Training or Interval Randomizer?

Reaction Timer Training ships an update every 3 months, and Interval Randomizer monthly. Most recently, Reaction Timer Training was updated on October 5, 2026 and Interval Randomizer on October 6, 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.*