# Chain Reaction vs Stopwatch Challenge

The clearest difference is ads: Stopwatch Challenge at none against Chain Reaction's shown. Stopwatch Challenge also leads on update cadence (daily vs every 3 months). Chain Reaction's advantage is device support (3 vs 1) and iOS requirement (11.0 vs 17.0). On price and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Chain Reaction ships an update every 3 months, Stopwatch Challenge daily. The most recent releases landed on October 11, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Chain Reaction | Stopwatch Challenge |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Daily** |
| Size | 66 MB | 11 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ANJU SIIMA TECHNOLOGIES PRIVATE LIMITED](https://appshunter.io/developer/1446564147) | [Thibault Ducret](https://appshunter.io/developer/1842797901) |

## What reviewers say

### Chain Reaction

[App page](https://appshunter.io/ios/app/chain-reaction-multiplayer/id1592677727)

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

**In-app purchases:** none


### Stopwatch Challenge

[App page](https://appshunter.io/ios/app/stopwatch-challenge/id6811134669)

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

**In-app purchases:** none


## Frequently asked questions

### Is Chain Reaction free?

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

### Is Stopwatch Challenge free?

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

### Do Chain Reaction or Stopwatch Challenge have ads?

Chain Reaction shows ads; Stopwatch Challenge does not.

### Which is updated more often, Chain Reaction or Stopwatch Challenge?

Chain Reaction ships an update every 3 months, and Stopwatch Challenge daily. Most recently, Chain Reaction was updated on October 11, 2026 and Stopwatch Challenge on October 26, 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.*