Privacy Policy

Every calculation runs locally in your browser. Distances, times and weights you type in are never uploaded.

What we collect

• Usage statistics from Cloudflare Web Analytics and Google Analytics (pages viewed, referrer, device type, approximate region, clicks) to see which tools are useful. The values you type into a calculator are not sent.
• If you voluntarily submit a race result, only distance, time, age and gender are stored — no name, location or device ID.
• If you create an account: email address (via Supabase Auth magic link), subscription status from Creem, optional training-plan inputs/history, and anonymous browser keys used only for free monthly quotas.
• Payment card details are handled by Creem — we never see or store full card numbers.

Accounts, subscriptions and processors

Authentication is provided by Supabase. Paid subscriptions are billed by Creem (Merchant of Record). Webhooks update your entitlement on our database. You can request account deletion via the contact page.

Third-party services

• Cloudflare Web Analytics counts page views and countries without cookies and without building a cross-site profile.
• Google Analytics 4 measures how the site is used: pages, referrer, device, approximate region and interactions such as clicks. Page addresses are sent without their query string, so the numbers inside a shared link are not recorded. It sets first-party cookies (_ga, _ga_*). In the EEA, the UK and Switzerland these cookies are set only after you consent; until then Google Analytics sends cookieless signals only. Google signals and Analytics advertising features are switched off. You can opt out with Google’s opt-out browser add-on.
• Supabase stores accounts, optional training-plan history and anonymous race submissions.
• Creem bills Pro subscriptions as Merchant of Record.
• FormSubmit relays messages sent through the contact form to our inbox.
• Amazon: some pages link to products on Amazon. If you click, Amazon may set its own cookies, and we may earn a commission on qualifying purchases. We do not learn who you are or what you buy.

Stored in your browser

Endurometry does not sell your personal data, and its own scripts set no cookies. They use localStorage for three things: your language choice (pl_lang), a random anonymous key that rate-limits race submissions and counts the free monthly quota (pl_cid), and — only if you sign in — your session (pl_session). Clearing this site’s data removes all three. Google Analytics sets its own cookies, described under Third-party services.

Advertising

Current status: no ads are running yet, so no consent message appears and no advertising cookies are set. The rest of this section describes what will apply once ads are switched on.

Ads on this site are served by third-party vendors, including Google AdSense. Third-party vendors, including Google, use cookies — such as Google's DoubleClick cookie — to serve ads based on your prior visits to this and other websites. That is called interest-based or personalised advertising. Google explains its use of this data in How Google uses information from sites or apps that use its services.

• EEA, UK and Switzerland: before any advertising cookies are set, a Google-certified consent management platform (Google’s Privacy & messaging) asks for your choice. If you decline, Google may show non-personalised ads, which are not based on your past browsing but can still use cookies for frequency capping, fraud prevention and aggregate reporting, or limited ads, which use no cookies.
• Opting out: you can turn personalised advertising off at any time in Google's Ads Settings, or through the industry opt-outs at aboutads.info (US) and youronlinechoices.eu (EU).
• Refusing or withdrawing consent never affects the tools: every calculator keeps working without ads.

Advertising disclosure last updated: 2026-10-05.

Contact

Questions? Reach us via the contact page.