Privacy Policy

Last updated: 2026-06-01

Core principle

Circflow is a purely static, backend-free site. We ourselves do not collect, store or upload any of your personal information, and your inputs and calculation results never leave your browser.

Local storage (localStorage)

• Features such as bookmarks and recent calculation history use the browser's localStorage; the data stays only on your local device and is never sent to us or any third party.
• Clearing your browser data deletes them. In preview/sandbox environments this feature may be unavailable, which is normal.

Calculations are not tracked

All tool computation logic runs in the front end and sends no requests to any external API. We do not know what you calculated or what values you entered.

Third-party ads and analytics

To understand traffic and keep the site running, pages may load Google Analytics 4 (GA4) and Cloudflare Web Analytics (a privacy-first, cookieless measurement that sets no cookies and collects no personal data) for aggregate, page-level analytics, and may display ads served by third-party ad networks (such as Ezoic). When these services are enabled, they may:

• set cookies or similar technologies to measure visits and serve/measure ads;
• collect aggregate device/browsing information (e.g. pages viewed, approximate location, device type) per their own privacy policies (this part is outside Circflow's control).

GA4 measures page-level activity only — it does not receive the values you type into the calculators, and your bookmarks/calculation history stay in your local browser. For details, see the Google Privacy Policy and the privacy/cookie policies of any ad provider. You can manage cookie preferences in your browser or in your region's privacy options.

Note: analytics (GA4) loads only when a measurement ID is configured for the production site; ad scripts apply as soon as the relevant services are integrated. Embedded/iframe uses of a tool (?embed=1) do not load analytics.

External links

This site may link to third-party websites whose privacy practices are their own responsibility; please consult their respective policies. For related commercial disclosures, see the Affiliate Disclosure.

Children's privacy

This site provides general-purpose engineering tools, is not directed at children, and does not knowingly collect any personal information.

Policy updates

This policy may be updated as features change; please refer to the "Last updated" date at the top of the page. Continued use indicates that you understand this policy.