Ad-free and private — for the price of a coffee
Every calculator stays free, forever. Pro is for when you want the site ad-free and a private cycle tracker that syncs across your devices — without your data ever being sold.
or $4.99 / month · cancel anytime · no lifetime lock-in
No ads, anywhere
Every calculator and guide, completely ad-free — faster pages and nothing between you and the answer.
Private tracker, synced across your devices
Your cycle log stays encrypted and yours. Pro syncs it between your phone and laptop — we never sell or share it.
Export your cycle history
Download a clean PDF of your cycle calendar to keep, print, or take to an appointment.
Support an independent, private tool
No data-selling, no investors to please — Pro is what keeps Period Tools free and private for everyone else.
What stays free — always
Pro never puts the basics behind a paywall. Every calculator, chart, and guide — period and ovulation, due date, pregnancy week-by-week, the pregnancy-safety A–Z, all of it — is free with no account and nothing logged. We think that’s how it should be. Pro simply removes the ads and adds a private, synced tracker for the people who want those extras, and it’s what funds keeping everything else free and ad-light.
Privacy isn’t an add-on here
Most period apps make money from your data. We don’t. The free tools run entirely in your browser, so your inputs never leave your device. Pro adds an account only so your tracker can follow you between phone and laptop — and that data is encrypted and never sold or shared with advertisers. It’s the same promise either way: your cycle is your business, not ours to sell.
Frequently asked questions
- Do I need Pro to use the calculators?
- No. Every calculator, chart, and guide on Period Tools is free and always will be — no account, no login, nothing stored about you. Pro is an optional upgrade that removes ads and adds a private, synced tracker for people who want it.
- How is my data handled?
- The free tools run entirely in your browser — nothing about your inputs leaves your device. Pro adds an account only so your tracker can sync across your devices; that data is encrypted and never sold or shared. Unlike many period apps, selling your data isn't our business model.
- Can I cancel anytime?
- Yes. Pro is a simple subscription you can manage or cancel whenever you like from your dashboard, which links straight to the secure billing portal. No lock-in, no cancellation hoops.
- What does it cost?
- $19.99 a year, or $4.99 a month — well under what the big period apps charge. There's no lifetime plan; it's a straightforward subscription that keeps the free tools running.
— The Period Tools Team