Privacy Policy
How compost.tools handles cookies, consent, analytics, and local browser storage.
Last updated: June 2026
Overview
compost.tools ("we," "our," or "the site") is committed to protecting your privacy. This policy explains what data we collect, how we use it, and your choices. All calculations run entirely in your browser — no calculation inputs are transmitted to our servers.
Information We Collect
We do not collect personally identifiable information unless you contact us directly. The site uses two categories of tracking:
- Analytics (Google Analytics 4): GA4 collects anonymized usage data including pages visited, time on page, browser type, and general geographic region. IP addresses are anonymized. We use this to understand which calculators are most useful. Outside the EEA, UK, and Switzerland analytics runs by default and you can opt out at any time using the "Reject" button on the cookie banner. Within the EEA, UK, and Switzerland no analytics cookies are set until you explicitly accept; until then GA4 uses only anonymized, cookieless Consent Mode measurement (no cookies, no cross-site identifiers).
- Advertising (Google AdSense): Personalized advertising and advertising cookies are disabled everywhere until you explicitly accept. These cookies are managed by Google's advertising systems.
If you click "Reject," no analytics or advertising cookies are set and any prior consent is withdrawn. The site functions identically with or without consent.
Cookies
compost.tools sets the following first-party cookies:
- compost_consent — Stores your cookie consent choice ("accepted" or "rejected"). Duration: 365 days. No personal data.
- _ga, _ga_<id> — Google Analytics 4 cookies used to distinguish unique visitors. Outside the EEA, UK, and Switzerland they are set by default and removed if you click "Reject"; inside those regions they are set only after you accept. Duration: up to 2 years. No directly identifying data.
Inside the EEA, UK, and Switzerland, Google Analytics sets no cookies until you accept (using only cookieless measurement until then). Google AdSense may set advertising cookies only after you accept, in all regions. See Google's Privacy Policy for details.
Local Storage
The site stores your unit preference (US vs. metric) in your browser's localStorage under the key compost_us. This data never leaves your browser and is not accessible to us.
Google Consent Mode v2
We use Google Consent Mode v2 with region-scoped defaults. For visitors in the EEA, UK, and Switzerland, all ad_storage, ad_user_data, ad_personalization, and analytics_storage signals default to "denied" and are upgraded to "granted" only if you explicitly accept. While analytics is "denied," GA4 sends only cookieless, anonymized Consent Mode pings (no cookies are written) until you accept. For visitors elsewhere, analytics_storage defaults to "granted" (so anonymized analytics works without a click) while all advertising signals remain "denied" until you accept. Clicking "Reject" downgrades every signal back to "denied."
Third-Party Services
- Google Analytics 4 — Privacy Policy
- Google AdSense — Privacy Policy
- Cloudflare — The site is hosted on Cloudflare Workers. Cloudflare may log request metadata per their Privacy Policy.
Your Rights
You may withdraw consent at any time by clearing your browser cookies and local storage for compost.tools. If you are in the EU/EEA or UK, you have rights under GDPR including access, correction, deletion, and objection to processing. Contact us at contact@compost.tools to exercise these rights.
Children's Privacy
compost.tools does not knowingly collect data from children under 13. If you believe a child has provided personal information, contact us immediately.
Contact
For privacy questions: contact@compost.tools