Privacy Policy

The short version: Period Tools doesn’t store, sell, or share your cycle data. Every calculator runs in your browser, so your inputs never reach our servers. This page lays out the longer version.

1. What we collect

Calculator inputs (dates, ages, blood types): not collected. These are processed in your browser only and are discarded when you refresh or leave the page.

Email: only when you choose to email us. We reply, then keep your email in our inbox like any other email conversation.

Analytics: we use Google Analytics and Vercel Analytics to understand which pages people visit, on what devices, and from where (country/region level). We do not identify individual visitors.

2. Cookies

Period Tools uses two kinds of cookies:

• Strictly necessary: basic operational cookies that the site needs to function.
• Analytics & ads: set by Google Analytics and Google AdSense for measurement and ad personalisation. These fire only after consent where required (EU/UK/EEA visitors).

3. Advertising

We display ads via Google AdSense (or, as the site grows, another ad network such as Ezoic or Mediavine). Ad networks use cookies and similar technology to serve ads relevant to you and measure their performance. You can opt out of personalised advertising at Google Ad Settings and aboutads.info/choices.

4. Affiliate links

Period Tools does not currently use affiliate links. If we add them in the future, we will clearly disclose it — and any such link would only ever earn us a small commission at no extra cost to you.

5. Your rights (GDPR / UK GDPR / CCPA)

If you’re a resident of the EU, UK, or California, you have the right to:

• Access any personal data we hold about you (typically: your email)
• Request correction or deletion of that data
• Withdraw consent for analytics or advertising cookies
• Lodge a complaint with your local data-protection authority

To exercise any of these rights, email us at [email protected].

6. Data retention

Calculator inputs: kept only in your browser. Email correspondence: kept while it’s useful or until you ask us to delete it. Analytics data: aggregated; individual visitor data is rotated out on Google’s standard retention windows.

7. Children

Period Tools is not directed at children under 13 (or 16 in the EU/UK if local law requires). We do not knowingly collect personal data from children. If you believe we have, please email us and we’ll delete it.

8. Changes

When we update this policy, we’ll bump the “Last updated” date at the top. Continued use of the site after a change means you accept the new policy.

9. Contact

Email [email protected] for any privacy question.