# Pacebase vs PEM Diary

The clearest difference is in-app purchases: PEM Diary at none against Pacebase's 3. PEM Diary also leads on ads (none vs shown). Pacebase's advantage is update cadence (every 9 days vs every 3 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Pacebase sells 3 in-app purchases, starting at $6.99 per month. PEM Diary asks for nothing beyond the download.

Pacebase ships an update every 9 days, PEM Diary every 3 months. The most recent releases landed on September 18, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Pacebase | PEM Diary |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pacebase/id6642664844/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 9 days** | Every 3 months |
| Monetization | Subscription | **Free** |
| Size | 42 MB | 92 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Pacebase Health, LLC](https://appshunter.io/developer/1763440954) | [Add Jam](https://appshunter.io/developer/1075812699) |

## What reviewers say

### Pacebase

[App page](https://appshunter.io/ios/app/pacebase/id6642664844)

This app helps manage energy-limiting chronic conditions by leveraging your Apple Watch data. It provides a Body Score to assess recovery and a Body Budget to guide safe activity levels, preventing crashes.

**Highlights:** Body Score for recovery assessment, Body Budget for safe activity guidance, Apple Watch integration, Continuous widget updates, Management of energy-limiting conditions

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pacebase | $6.99 | per month |
| Pacebase | $8.99 | per month |
| Pacebase | $86.00 | per year |


### PEM Diary

[App page](https://appshunter.io/ios/app/pem-diary-mecfs-crash-log/id6743624638)

This app helps individuals manage post-exertional malaise (PEM) by logging crashes, tracking severity, symptoms, and duration. It provides insights into patterns and creates a shareable record for personal reference or healthcare discussions.

**Highlights:** Log PEM crashes with dates, Track severity and symptoms, Add contextual notes, View trends on timeline/dashboard, 100% private local storage, Export data as CSV

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Pacebase free?

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

### Is PEM Diary free?

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

### Do Pacebase or PEM Diary have ads?

Pacebase shows ads; PEM Diary does not.

### Which is updated more often, Pacebase or PEM Diary?

Pacebase ships an update every 9 days, and PEM Diary every 3 months. Most recently, Pacebase was updated on September 18, 2026 and PEM Diary on September 10, 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.*