Calculators
Three calculators that never phone home
Due date, ovulation and next period. Each one is the arithmetic PinkyBloom runs on your phone, running here in your browser instead — no account, no upload, no cookie to accept.
Runs in your browser. Nothing you enter is sent anywhere — open your browser's network tab and check.
Why build calculators that anyone could build? Because the ones you find first ask for your email, set a dozen trackers, and keep the dates. These do none of that — open your browser's network tab while you use one and watch nothing leave. It is the same standard the app holds itself to, applied to a web page.
Every number comes from one shared engine, ported from the app's own code: the 280-day due date rule, the 14-day luteal anchor for ovulation, the six-day fertile window, the 24–38 day range for a typical adult cycle. When the web and the phone give you the same answer, that is why.
None of it is medical advice. A due date is an estimate; an ovulation estimate is not contraception; a period prediction is an average. Each page says so where it matters.
The same math, on your phone
The full version is free, on your phone
PinkyBloom runs these calculations from the dates you actually log, across cycle, pregnancy, postpartum, perimenopause and menopause — and if you pair with your partner, his app knows the week without ever seeing your log.
Free on iPhone and Android. No account, no email, no phone number. Your health data stays on your phone unless you turn on iCloud backup or partner sharing — and we can't read it either way.
