Perimeter
Perimeter privacy policy
Last updated 6 September 2026.
Perimeter tracks perimenopause symptoms, including the ones nobody connects, and turns a stretch of them into something you can say at an appointment. This policy explains what is kept, where it sits, and who can reach it.
This is health information, and it is treated that way
What you record in Perimeter is information about your body, at a point in your life you may not have told anyone about. There is no useful way to soften that, so the rest of this page is specific rather than reassuring.
Your entries are sent to Anthropic to be analysed
Perimeter does not find patterns with code on our own machines. When you ask for an analysis or an appointment script, the symptom entries in that window are sent to a large language model run by Anthropic, and the result comes back to us. That includes the severities you recorded, your sleep and stress figures, and anything you wrote in a notes field.
Nothing is sent until you ask for one of those two things. Logging a day on its own stays on our database and goes nowhere else.
What is stored
- Your email address, and the cycle pattern you chose when you signed up.
- One record per day you fill in: the severity you gave each symptom on a nought to ten scale, hours slept, a stress rating, and anything you wrote in the notes field.
- The analyses Perimeter generates, with the stretch of dates each was drawn from.
- The appointment scripts: the opener, the points and the questions written for you to take in.
- Whether your subscription is active, and when the current period ends.
What is not stored
No password, because there is not one. Signing in is by a code sent to your email address. No name, no date of birth, no address, no phone number, and no insurance or payment details. The app has nowhere to put them.
Who can see it
You, and nobody else using the app. Every table checks the signed in account against the owner of the row before it returns anything, so another user cannot reach your days even if they go looking. There is no sharing feature, no clinician view and no household account. We do not sell any of it, we do not send it to advertisers, and no employer or insurer has any route to it.
Who else is involved
- Anthropic receives the entries in a window when you ask for an analysis or a script, as described above.
- Supabase hosts the database and sends the sign in codes.
- Apple handles subscriptions bought in the app, and tells us only whether yours is active.
Deleting it
Deleting your account removes your profile, every day you logged, every analysis and every script. It is immediate and it is not recoverable, so save anything you want to take to an appointment before you delete.
Cancelling a subscription is separate and is handled in your Apple subscription settings, because Apple owns that relationship rather than us.
Contact
Perimeter is published by Jeffrey L Carrier.