Privacy

Who is responsible

ReactionCheck is maintained by Anil Gautam. Contact anilgautamwork@gmail.com with privacy questions or requests.

Local test data and preferences

Reaction times, controller inputs, mouse events and screen tests are processed in the page. We do not upload raw input events, device identifiers or test scores. The spacebar counter saves one best count per duration in your browser’s local storage; your theme choice is also saved there. Clear site data to remove them. Sharing a result copies text to your clipboard; you decide where to share it.

Optional Google Analytics

We load Google Analytics only after you select Allow analytics. It measures page visits, basic device/browser information and tool starts and completions so we can understand which tools people use. Google receives the associated network requests. We send the tool name and mode, not raw inputs, controller names, individual results or your email address. Page URLs are limited to known paths and exclude query strings and fragments; referrers are limited to their origin.

Analytics uses first-party cookies such as _ga and _ga_*. We set their lifetime to 60 days without extending it on each visit. Our consent choice is stored locally for up to 180 days. Google may process analytics data outside your country; see Google’s privacy policy. We do not enable Google signals, advertising personalization or advertising integrations. The site currently displays no ads.

Reject analytics to use all tools without loading Google Analytics. Use Analytics preferences in the footer to change your choice. Rejecting after accepting removes this site’s Analytics cookies and reloads the page to stop the tag. Your choice applies to this browser, not other devices. Previously collected data is not automatically erased by withdrawing consent; contact us with questions.

Google Analytics user-level and event-level retention is set to two months, with reset on new activity disabled. This setting does not limit all aggregated reports.

Hosting and security

Cloudflare delivers the site and self-hosted fonts. It receives request information such as your IP address and browser headers for delivery and security, regardless of your analytics choice. Its processing and retention are governed by its services and privacy policy. We do not claim a fixed retention period for Cloudflare’s service data.

Contact emails

If you email us, we receive your address and anything you include through Gmail. We use it to respond and investigate your request. Avoid sending sensitive information. Contact us to request deletion of correspondence; necessary records may need to be retained for applicable obligations. No fixed email-deletion schedule is currently promised.

Updates

Last updated 27 September 2026. We will update this page when our data practices change. External links open other services under their own policies.