PEM Diary vs VIRTUS.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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!
VIRTUS.
This app provides detailed data on your workouts, showing your progress with real-time updates on estimated 1RM, training intensity, and muscle engagement. It helps you train smarter by visualizing your strength and volume.
- Real-time estimated 1RM updates
- Track training intensity
- Strength Triangle visualization
- Volume Circle for muscle engagement
- Detailed workout data breakdown
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Virtus isn’t just another workout app. I built this because I was tired of guessing if I was actually getting stronger. This shows you. Every workout, every set, every rep broken down into real data you can actually understand. • See your estimated 1RM update in real time • Track how hard you’re training with intensity • Visualize your strength with the Strength Triangle • See exactly what muscles you’re hitting with the Volume Circle Just proof that you’re improving. Or proof that you’re not. Train smarter. Train Virtus
Screenshots
Verdict
The clearest difference is rating: VIRTUS. at 5.0 against PEM Diary's 4.0. On price, ratings volume, update cadence and ads 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
VIRTUS. holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 3 respectively.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 17, 2026 and October 8, 2026 respectively.
| Parameter | PEM Diary | VIRTUS. |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (2 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 66.7% of reviews | — |
| Number of ratings | 2 | 3 — better |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 92 MB | 73 MB |
| Age rating | 17+ | 4+ |
| Developer | Add Jam | THOMAS FRANCIS LUSSIER |
Customer experience
PEM Diary
VIRTUS.
In-app purchases
PEM Diary
No in-app purchases
VIRTUS.
No in-app purchases
