# Challenge 4 Change vs ZoneFlow

The clearest difference is update cadence: Challenge 4 Change at every 3 months against ZoneFlow's every 18 months. ZoneFlow's advantage is iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Challenge 4 Change ships an update every 3 months, ZoneFlow every 18 months. The most recent releases landed on September 8, 2026 and May 31, 2026 respectively.

## The numbers

| Metric | Challenge 4 Change | ZoneFlow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 18 months |
| Size | 213 MB | 2 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPod, Apple Watch** |
| Age rating | 12+ | 4+ |
| Developer | [Challenge 4 Change GmbH](https://appshunter.io/developer/1593236451) | [Adrian Rollett](https://appshunter.io/developer/1776487100) |

## What reviewers say

### Challenge 4 Change

[App page](https://appshunter.io/ios/app/challenge-4-change/id1593236449)

**Features:** macOS Compatibility

**In-app purchases:** none


### ZoneFlow

[App page](https://appshunter.io/ios/app/zoneflow/id6739025069)

**In-app purchases:** none


## Frequently asked questions

### Is Challenge 4 Change free?

Challenge 4 Change is free to download, with no in-app purchases.

### Is ZoneFlow free?

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

### Do Challenge 4 Change or ZoneFlow have ads?

Neither Challenge 4 Change nor ZoneFlow shows ads.

### Which is updated more often, Challenge 4 Change or ZoneFlow?

Challenge 4 Change ships an update every 3 months, and ZoneFlow every 18 months. Most recently, Challenge 4 Change was updated on September 8, 2026 and ZoneFlow on May 31, 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.*