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A ME/CFS symptom tracker app that works on crash days

Heylixir is a ME/CFS symptom tracker app built for low-energy days. Say how you feel and it logs your fatigue, symptoms, meds, mood and journal, so you can look back at what came before a crash and bring clear notes to your care team.

Heylixir journal screen where you log ME/CFS symptoms

Log a crash day without spending a spoon

Post-exertional malaise can arrive a day or two after you overdo it, which makes the cause hard to see. Logging a short note every day, even on bad days, gives you the timeline that memory cannot.

In Heylixir you rate your fatigue, add your symptoms and say what you did, by voice or tap. It takes seconds.

Energy and fatigue ratings with a short note

PEM, pain and other symptoms with intensity

Log by voice from bed on crash days

Heylixir insights screen showing patterns in ME/CFS symptoms

Spot what comes before your crashes

Because Heylixir keeps your energy, activity notes, sleep, mood, meds and symptoms together, you can look for what tends to come before a crash. Halo AI points out patterns in your own logs in plain language.

Patterns are not a diagnosis, but they help with pacing and give you concrete things to discuss with your healthcare provider.

Sleep and fatigue side by side

Activity and delayed crashes on one timeline

Patterns in your own logs, in plain language

Heylixir doctor summary with ME/CFS symptoms and medication history

Pace with more confidence

Pacing is personal. Knowing your usual energy, what costs you most and what helps you recover makes it easier to rest before the crash instead of after it.

Read about [spoon theory energy tracking](/spoon-theory-energy-tracking/) if you plan your days in spoons, and bring a summary to appointments so your notes carry weight.

Log a crash day with your voice

On a crash day every interaction costs energy. Say how you feel in Heylixir and your voice note does the logging for you.

“Crashed after the shower, heavy legs, foggy, slept badly, took my meds, feeling low.”

Mood: low, drained

Symptoms: fatigue, heavy legs, brain fog

Medication: taken, noted with the time

Journal: your words, saved as today's entry

See how voice tracking works →

Ready to track your ME/CFS?

Try Heylixir and start logging ME/CFS symptoms, meds and mood in seconds, even by voice.

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FAQ: ME/CFS tracking

The best app is the one you will actually use on hard days. Heylixir is a symptom tracker app for chronic illness that lets you log by voice or tap, and keeps symptoms, meds, mood and a journal in one place so you can see patterns. See our honest comparison of symptom tracker apps.

Common things people with ME/CFS track are fatigue and energy, post-exertional malaise (PEM) and its timing after activity, unrefreshing sleep, brain fog, dizziness, pain, medications and supplements, and activity levels. A few consistent notes beat a perfect log you give up on.

No. Heylixir is not a medical device and does not give medical advice. It helps you keep a clear record and notice patterns in your own logs, so conversations with your healthcare provider are easier.

Heylixir can create a clear summary of how you have been doing that you can bring to appointments. See our doctor summary page.

Halo AI is built into Heylixir. It looks across your logs and points out patterns, triggers and early signs of flares in plain language. These are patterns in your own data, not a diagnosis.

Heylixir helps you notice how activity, energy and symptoms connect over time, which many people use to pace. It does not measure heart rate or give pacing instructions, so use it alongside advice from your healthcare provider. If you want a heart-rate pacing tool, see our Visible comparison.

Yes. In Heylixir you just say how you feel and Heylixir logs your mood, symptoms, meds and journal for you. Read more about voice symptom tracking.

Yes. Tracking with Heylixir is meant to be easy, fast and painless, even on hard days. You can lie back, say a few words, give your entry a quick look and save it, with no forms to fill in.

Voice tracking supports around 100 languages. Accuracy may vary by language, accent and how clear your audio is, so give your entry a quick look before you save it. See the full list on our voice tracking page.

Yes. Voice tracking works offline, so you can log when you have no signal and your entry is there when you are back online.