Support.

Email hi@rhythmbio.app and a real person (the one who built it) will reply, usually within a day. Tell us which device you're on and what you were trying to do, and a screenshot helps.

Subscribed in the iPhone app? Apple handles the billing. Manage or cancel it in your iPhone's Settings → your name → Subscriptions, or from Settings in RhythmBio. For a refund, ask Apple at reportaproblem.apple.com. If you reinstall or switch phones, tap Restore purchases in Settings.

Subscribed on the website? Manage or cancel it from Settings at rhythmbio.app in a browser.

My chart looks wrong. Everything is calculated from your date of birth, so check it in Settings first. Your day rolls over at your own local midnight.

I'm not getting the morning notification. Turn it on in Settings, then check RhythmBio is allowed to send notifications in your iPhone's Settings → Notifications.

How do I delete my account? Settings → Delete account. It removes your profile, journal and family members for good.

RhythmBio is a tool for reflection, not medical advice. Biorhythm theory hasn't been validated by controlled studies; treat it as a lens on your day and trust how you actually feel.