# Pacing vs Mast'O

The clearest difference is update cadence: Pacing at every 4 days against Mast'O's every 15 months. Mast'O's advantage is iOS requirement (14.0 vs 16.6). 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.

Pacing ships an update every 4 days, Mast'O every 15 months. The most recent releases landed on October 14, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Pacing | Mast'O |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 15 months |
| Monetization | Free | — |
| Size | 1 MB | 26 MB |
| Requires iOS | 16.6 | **14.0** |
| Devices | iPhone, Apple Watch | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Q_PERIOR AG](https://appshunter.io/developer/532082988) | [Filière MaRIH](https://appshunter.io/developer/1727106794) |

## What reviewers say

### Pacing

[App page](https://appshunter.io/ios/app/pacing/id6448513970)

This app helps individuals with ME/CFS manage their activity levels by monitoring heart rate against personalized thresholds. It provides visual cues and alerts to prevent overexertion and potential relapses, integrating with Apple Health for comprehensive tracking.

**Highlights:** Activity management for ME/CFS, Personalized heart rate thresholds, Relapse prevention alerts, Visual heart rate zone indicators, Apple Health integration, Apple Watch exclusive

**Features:** Apple Watch app

**In-app purchases:** none


### Mast'O

[App page](https://appshunter.io/ios/app/masto/id6476554444)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Pacing free?

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

### Is Mast'O free?

Mast'O is free to download, with no in-app purchases.

### Do Pacing or Mast'O have ads?

Neither Pacing nor Mast'O shows ads.

### Which is updated more often, Pacing or Mast'O?

Pacing ships an update every 4 days, and Mast'O every 15 months. Most recently, Pacing was updated on October 14, 2026 and Mast'O on October 5, 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.*