Aster
Your pain is real. Now it's on the record.
Aster is a private endometriosis symptom tracker that turns your day-to-day pain into a clear, one-page report your doctor can act on.
Free to use. No account. Your data never leaves your phone.
Walk in with evidence
One page, designed around what an OB/GYN needs: average and peak pain, flare days per month, your most frequent symptoms, cycle patterns, and the treatments you've tried.
Timestamped. Structured. Hard to dismiss.
Getting believed shouldn't take years
People with endometriosis wait years for a diagnosis — and those who feel dismissed by their doctors wait longest. "It's just bad periods" isn't a diagnosis. Evidence changes conversations. Aster helps you build it, one ten-second log at a time.
Log a flare in seconds
Built for your worst days: a big tappable pain scale and one-tap symptom chips. No typing, no friction — log from the app, your Lock Screen, or a Home Screen widget.
See your patterns
Pain over time, symptom frequency, and how it all lines up with your cycle. Spot the patterns before your specialist asks about them.
Track what helps
Medications, supplements, hormone therapy — record what you take and rate what actually works, so treatment conversations start from facts.
Completely private. On purpose.
No account. No cloud. No analytics. Everything you record stays on your phone, protected by your device's encryption and an optional Face ID lock.
We can't see your data — we built Aster so we never could. That's why our App Store privacy label reads "Data Not Collected."
Free where it matters
Logging, cycle tracking, trends, and a basic doctor report are free forever.
Aster Premium — $3.99/month or $29.99/year, 7-day free trial
Advanced cycle analysis, custom report ranges, medication effectiveness insights, reminders, and unlimited history export.
Frequently Asked Questions
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No — it's a symptom tracker. Your cycle is context for your pain, not the main event. Log as much or as little cycle detail as you like.
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Yes. Aster has no servers and makes no network requests with your data. Deleting the app deletes everything, permanently. Read our privacy policy for more information.
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No. Only a clinician can do that. Aster gives you a clear record so those conversations are grounded in evidence, not memory.
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iPhone (iOS 17 or later).