Comparison

Pacebase vs PEM Diary

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Pacebase

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
Read full description

Pacebase is an all-in-one toolkit for managing your energy-limiting chronic condition, like POTS and ME/CFS. We turn your Apple Watch into a powerful tool for measuring and understanding your body, and its limits. Our Body Score uses several of your bodies biomarkers to give you a simple, accurate measure of how your body recovered from the day before, through a straightforward 50-100-point scale. Our Body Budget suggests the amount of time you can expect to safely go above your anaerobic threshold for the day to minimize crashing. It also comes with an helpful Apple Watch widget, which updates continuously throughout the day. A subscription is required to use Pacebase, but we offer a 14-day risk-free trial period within the app. No commitment is required. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

PEM Diary

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
Read full description

Do you experience episodes of extreme fatigue? PEM Diary helps you log and track post-exertional malaise (PEM) with personal records, including severity, symptoms, and duration. Whether you’re managing ME/CFS (Myalgic Encephalomyelitis/Chronic Fatigue Syndrome) or dealing with unexplained fatigue, this app helps you identify patterns and keep a record for personal reference or discussions with your healthcare provider. FEATURES: - Log PEM crashes with start & end dates - Track severity (1–5 scale) & symptoms - Add notes for additional context - View trends with a timeline & dashboard - 100% private – all data is stored locally on your device and never leaves it unless you export it - Data export - export your collected data as a CSV which is easily shareable with health care professionals or studies Use PEM Diary to track PEM for personal insights or to support medical discussions and diagnosis efforts. Start managing your health more effectively today! PRIVACY & SECURITY Your health data never leaves your device unless you choose to export it. No cloud storage, no data sharing – complete privacy guaranteed. MADE FOR YOU Perfect for: • Tracking PEM patterns • Supporting healthcare discussions • Understanding your energy limits • Building a detailed health record MEDICAL NOTICE PEM Diary is a personal tracking tool. Always consult healthcare professionals for medical advice and treatment decisions. Download now to take control of your energy management journey! Start tracking your PEM episodes!

Screenshots

Pacebase4 screens
PEM Diary4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Pacebase versus PEM Diary: the parameters behind the verdict, then further details
ParameterPacebasePEM Diary
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews—50.0% of reviews
Number of ratings1 — better—
Update frequencyEvery 9 days — betterEvery 3 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationSubscriptionFree — better
DevicesiPhone, iPod, Apple Watch — betteriPhone, iPod
Requires iOS15.115.1
Further details — not scored
Size42 MB92 MB
Age rating4+17+
DeveloperPacebase Health, LLCAdd Jam

In-app purchases

3 purchases

Pacebase

Subscriptions3
  • Pacebase$6.991 Month
  • Pacebase7 Days trial$8.991 Month
  • Pacebase$86.001 Year
None

PEM Diary

No in-app purchases

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.

Other comparisons