PeriodTools puts cycle tracking in the browser

PeriodTools launched free cycle and ovulation calculators, plus a period tracker that stores entries locally on a user’s device instead of on a company server. The setup limits data exposure, but it also means clearing browser data can erase logs unless users pay for backup and cross-device sync.

Why it matters: - Period tracking can reveal sensitive health information, including dates, flow, symptoms, moods and notes. - PeriodTools’ free tracker keeps that data in the browser’s local storage on the user’s device, not on a server. - That reduces the risk of a stored profile being requested, breached or sold. - The trade-off is durability and convenience: local entries disappear if browser data is cleared and do not automatically move to another device. - Optional backup and cross-device sync are available as a paid upgrade for users who want account-based storage.

What happened: - PeriodTools published a free suite of cycle and fertility calculators, including a period tracker. - The tracker does not require an account, sign-up or paywall. - The company said the tracker is available at PeriodTools. - PeriodTools also offers optional backup and cross-device sync as a paid feature.

The details: - The free tracker stores entries in the browser’s own local storage. - Without an account, cycle entries are not transmitted to a server. - Users on the free version have no stored profile on PeriodTools’ side. - The company says the local-only design means the tracker cannot access or store data on its servers. - Clearing browser data removes the log. - A second device will not automatically show the same entries unless the user upgrades and enables sync. - PeriodTools’ calculators and reference pages cover cycle length, ovulation timing, conception and related questions. - The site says the tools are informational and are not a medical device, medical advice or a contraceptive method. - People with concerns about cycle, fertility or reproductive health should consult a qualified healthcare professional.

Between the lines: - PeriodTools is positioning privacy as a product design choice, not just a policy promise. - The company is also making the limitation visible up front, which may appeal to users who prefer control over convenience. - The paid sync tier creates a clear split between local-only tracking and account-based continuity.

What's next: - Users who want a no-account tracker can use the free version immediately. - Users who need backup or multi-device access can opt into the paid upgrade. - PeriodTools’ informational pages and calculators remain available alongside the tracker.