Expain vs Mu.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Expain
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Tracking your pain is the first step to gain control over your pain. The Expain app lets you track and view your pain in an intuitive and simple way. To get started, select a body segment and enter how much it hurts. If you have pain in more than one segment, simply add more pain logs. If tracking your pain is not enough, use the Expain app to connect to the Expain Bluetooth Smart connected products. The app connects to Expain Change Neck & Shoulders, Expain Change Arm, Expain Activate Knee and Expain Relax Legs. The Expain Change products is biosensors that alert you with a gentle vibration when it detects a potential harmful muscle activity pattern.
Mu.
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Mu. Mu. is a daily log for the things that affect how you feel: track mood, symptoms, habits, medications — and let patterns emerge naturally over time. Simple. Modern. Free. Private. —WHAT YOU CAN DO— *Track Events Choose what to track: insomnia, anxiety, stress, medication, or create custom events that matter to you. Log as many or as few as you like. *Log Your Mood Record how you feel on a scale of 0 to 10. *Write Notes Attach a note to any logged event or mood. *Explore Patterns View your data with intuitive charts and statistics. Filter by event type and adjust the time period to see what influences your wellbeing. *Export Your Data Download your history as a CSV or a detailed PDF report — complete with mood charts, color-coded grids, and event heatmaps. Pick the period and the events you want to include. *Apple Watch Companion Log events and your mood directly from your wrist. Data syncs automatically with your iPhone. —SOME WAYS TO USE MU.— • Mood Tracker • Medication Tracker • Pain Tracker • Symptom Journal —PRIVACY FIRST— Your data never leaves your device or iCloud. Without an account or internet connection, Mu. works entirely offline. All your entries—mood scores, events, notes—stay with you. —DESIGNED FOR YOU— Built to be intuitive and calming, by someone who uses it daily. —MEDICAL DISCLAIMER— This app is not a substitute for professional medical advice, diagnosis, or treatment. If you have concerns about your health, please consult a qualified healthcare provider. —LANGUAGES— English, French, Spanish, Arabic —CONTACT & SUPPORT— Questions or feedback? Reach out to us directly from the app's Contact section or via our website, Reddit, Discord or Instagram.
Screenshots
Verdict
The clearest difference is update cadence: Mu. at every 10 days against Expain's every 5 months. Expain's advantage is iOS requirement (8.1 vs 18.6). On price, ads, in-app purchases and device support 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.
Expain ships an update every 5 months, Mu. every 10 days. The most recent releases landed on November 11, 2026 and November 9, 2026 respectively.
| Parameter | Expain | Mu. |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 8.1 — better | 18.6 |
| Further details — not scored | ||
| Size | 64 MB | 34 MB |
| Age rating | 17+ | 12+ |
| Developer | Expain AS | Liminal Pictures |
In-app purchases
Expain
No in-app purchases
Mu.
No in-app purchases









