Privacy Policy

reaction-time-test.io is designed with a privacy-first approach. We do not require user accounts and we do not collect or store personal information on our servers. Our tests run entirely in your browser. We use Matomo for anonymized analytics only (see below); we do not use advertising or marketing trackers.

In detail:

• No personal information: We do not ask for or collect your name, email address, location, or any other personally identifiable information.
• No user accounts: There is no registration, login, or profile system.
• Analytics (Matomo): We use Matomo to collect anonymized usage data (e.g. pages visited, referrer, device type) to improve the site. We do not use this data for advertising or to identify individuals. See the Analytics section below.
• No advertising: We do not serve ads and do not share data with advertising networks.

Some of our tests use your browser's localStorage to save your best scores and session history. This data:

• Is stored entirely on your device, in your browser
• Is never transmitted to our servers or any third party
• Is used solely to display your personal best and past sessions within the test interface
• Can be cleared at any time through your browser settings (clearing site data for reaction-time-test.io)

The following tests use localStorage:

We use Matomo to understand how visitors use our site. Matomo is a privacy-focused analytics platform. We use it to collect anonymized data such as:

• Pages visited and approximate time on page
• Referrer (the site or search that brought you here)
• Browser and device type (e.g. desktop vs mobile)
• Rough geographic region (country-level), derived from IP, not stored in identifiable form

We do not use this data to identify you, to build advertising profiles, or to share with third parties for marketing. It is used only in aggregated form to improve the site. Matomo can use a first-party cookie to distinguish unique visits; you can opt out via your browser settings or common privacy extensions if you prefer.

We use a small number of external services to deliver the site and to measure usage. These services may process limited technical data (such as your IP address) as part of normal web requests:

• Matomo; privacy-focused analytics; see the Analytics section above.
• Google Fonts (fonts.google.com) — delivers the Inter and JetBrains Mono typefaces. Google's Fonts privacy policy explains how they handle font requests.
• Tailwind CSS CDN (cdn.tailwindcss.com) — delivers our CSS framework. Standard CDN access logs may apply.

We do not use any social media embeds, advertising pixels, or third-party JavaScript beyond the services listed above.

Like most web servers, our hosting infrastructure may automatically log basic request data such as IP addresses, browser user-agent strings, and timestamps. These logs are used solely for security monitoring and debugging, are not linked to any personal identity, and are rotated and deleted on a regular basis.

Our site is a general-audience educational tool and does not knowingly collect any personal information from anyone, including children under 13. Since we collect no personal data, there is no COPPA-applicable data to manage.

Because we do not collect personal data, there is no personal data for us to provide, correct, or delete. The only user data that exists is in your browser's localStorage, which you fully control and can clear at any time through your browser settings.

If you are in the EU/EEA (under GDPR) or California (under CCPA/CPRA) and have questions about your data rights, please contact us and we will respond promptly.

If we make material changes to this privacy policy, we will update the "Last updated" date at the top of this page. We encourage you to review this page periodically. Our commitment to collecting no personal data is fundamental to how we built this platform, and any change to that stance would be clearly communicated.

If you have any questions about this privacy policy, please contact us at contact@reaction-time-test.io.