FatigueSense

FatigueSense

Manage your Fatigue levels

33 ratings
41 reviews
Free

Details

  • Released
  • Updated
  • April 9, 2026
  • October 10, 2026

Features

FatigueSense screenshot #1 for iPhone
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FatigueSense screenshot #6 for iPhone
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About

This app helps you understand and manage your energy levels by linking wearable data with daily check-ins. It provides insights into activity, recovery, and fatigue to help you pace your days and avoid crashing. Designed for individuals managing persistent fatigue conditions.

✓Daily energy budget tracking
✓Early PEM signal alerts
✓Strain, recovery, HRV, RHR, and sleep tracking
✓Activity planning within energy envelope
✓Crash logging and individual pattern learning
✓Wearable device integration (Apple Watch, Oura, Garmin, etc.)
✓Manual daily entry option
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+6

What's New in FatigueSense

1.5.1

October 10, 2026

Minor bug fixes

User reviews

Interesting, Maybe

I was referred to this by someone with similar symptoms. It's a bit clunky to use -- not the most intuitive interface. It also records PEM, long crashes (days to weeks), and daily energy plummets strangely. I haven't quite figured out to record these properly, especially when there are multiple episodes simultaneously of multiple types. And the first week's predictions are simply awful. I've been in a 3 week crash layered with PEM episodes and daily energy crashes, so that's my baseline with the app -- which says that my metrics show no indication of risk of PEM while I'm up to my eyeballs with it. I'll trial it a bit longer, but I'm skeptical atm.
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This may be helpful

Finally may have found an app that will help me.
A steep learning curve and must get into the habit of daily journaling but that’s for my benefit.
Lots of support & assistance

Great app

This app is great for tracking and predicting crashes/PEM/fatigue. It takes data from your wearable and predicts how your days will be and whether to take things easy. After the initial input for the first 5 or 6 days after joining, it judges how you will be after you’ve passed your baselines. It’s been majorly accurate - even the past couple of weeks I haven’t entered my personal daily data, it’s still been accurate just connecting to my Apple Watch and tells me when I need to take it easy. Great app.
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Very helpful

I ran this in parallel with another pacing app requiring me to wear a separate device from my watch. What I needed from an app was a day-to-day information on my HRV with some guidance on how to run my day. Since using FatigueSense, it has allowed me to pace myself without constant conversations about whether I would ‘pay’ later. I have found this very helpful and if you are on the fence, give it a go and see how it fits into your day.
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Promising

I don’t ever write reviews. This is not promoted or anything… just wanted to say that I am liking that this seems to track pretty accurately how I am feeling and a place I can bring it all together while it paces me. It’s meaningful data, now to get someone to listen.

FAQ

What is FatigueSense?

FatigueSense is a free lifestyle app designed to help users understand and manage their energy levels. It links data from wearables and daily check-ins to provide insights into activity, recovery, and fatigue, aiming to prevent energy crashes.

Who is FatigueSense designed for?

FatigueSense is specifically designed for individuals living with persistent fatigue conditions, including ME/CFS, long COVID, fibromyalgia, and cancer-related fatigue.

Does FatigueSense diagnose or treat medical conditions?

No, FatigueSense is assistive and statistical. Its outputs complement user judgment and do not diagnose or treat any medical condition. It does not assume all fatigue conditions behave the same way.

What devices does FatigueSense work with?

FatigueSense supports a wide range of wearables including Apple Watch, Oura, Garmin, WHOOP, Polar, Withings, and Fitbit. Manual daily entry is also an option if a device is not used.

How often is FatigueSense updated?

The latest version of FatigueSense is 1.4.65, which was last updated on 2026-06-27. Updates are released regularly to improve functionality and reliability.

What is the age rating for FatigueSense?

FatigueSense has an age rating of 17+. This is based on its content and intended audience.

Is FatigueSense available on Android?

FatigueSense is currently supported on iPhone, iPad, and iPod devices. Information regarding Android availability may be updated by the developer.

Does FatigueSense have ads?

No, FatigueSense does not contain advertisements. It is a free application with no in-app purchases or ads.