# RunWindow vs Reaction Light Trainer

The clearest difference is in-app purchases: RunWindow at none against Reaction Light Trainer's 2. RunWindow also leads on ads (none vs shown). Reaction Light Trainer's advantage is device support (4 vs 2) and iOS requirement (13.0 vs 17.0). On price and update cadence there is nothing between them.

Both are free to download. Reaction Light Trainer sells 2 in-app purchases, starting at $2.99 per year. RunWindow asks for nothing beyond the download.

RunWindow ships an update every 3 days, Reaction Light Trainer every 5 days. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | RunWindow | Reaction Light Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/runwindow/id6757280584/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 days** | Every 5 days |
| Monetization | Free | — |
| Size | 4 MB | 46 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [David Fields](https://appshunter.io/developer/1865754353) | [zhenyu song](https://appshunter.io/developer/1721282851) |

## What reviewers say

### RunWindow

[App page](https://appshunter.io/ios/app/runwindow/id6757280584)

This app guides your runs using haptic feedback and on-screen cues to keep you within your target heart rate or pace zones. It focuses on training by feel, minimizing the need to constantly check your watch. View run trends and summaries post-workout.

**Highlights:** Haptic feedback for pace and heart rate zones, On-screen color cues for effort level, Adjustable pace or heart rate windows, Run trend and summary data, Apple Health integration, No account or phone app required

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

**In-app purchases:** none


### Reaction Light Trainer

[App page](https://appshunter.io/ios/app/reaction-light-trainer-reflex/id6778074866)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads (Yearly) | $2.99 | per year |
| Remove Ads | $6.99 | one-time |


## Frequently asked questions

### Is RunWindow free?

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

### Is Reaction Light Trainer free?

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

### Do RunWindow or Reaction Light Trainer have ads?

Reaction Light Trainer shows ads; RunWindow does not.

### Which is updated more often, RunWindow or Reaction Light Trainer?

RunWindow ships an update every 3 days, and Reaction Light Trainer every 5 days. Most recently, RunWindow was updated on October 24, 2026 and Reaction Light Trainer on October 7, 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.*