# Parallel Rest Timer vs WaveFast

The clearest difference is in-app purchases: Parallel Rest Timer at none against WaveFast's 1. Parallel Rest Timer also leads on update cadence (weekly vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. WaveFast sells 1 one-off in-app purchase. Parallel Rest Timer asks for nothing beyond the download.

Parallel Rest Timer ships an update weekly, WaveFast every 3 weeks. The most recent releases landed on September 18, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Parallel Rest Timer | WaveFast |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 weeks |
| Size | 7 MB | 20 MB |
| Requires iOS | 18.0 | **17.6** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 9+ |
| Developer | [Remigiusz Herba](https://appshunter.io/developer/1688794004) | [瑞华 张](https://appshunter.io/developer/1608130007) |

## What reviewers say

### Parallel Rest Timer

[App page](https://appshunter.io/ios/app/parallel-rest-timer/id6762067074)

**Features:** Apple Watch app

**In-app purchases:** none


### WaveFast

[App page](https://appshunter.io/ios/app/wavefast-fasting-tracker/id6764770817)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| WaveFast Pro | $4.99 | one-time |


## Frequently asked questions

### Is Parallel Rest Timer free?

Parallel Rest Timer is free to download, with no in-app purchases.

### Is WaveFast free?

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

### Do Parallel Rest Timer or WaveFast have ads?

Neither Parallel Rest Timer nor WaveFast shows ads.

### Which is updated more often, Parallel Rest Timer or WaveFast?

Parallel Rest Timer ships an update weekly, and WaveFast every 3 weeks. Most recently, Parallel Rest Timer was updated on September 18, 2026 and WaveFast on September 14, 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.*