Privacy Policy
Last updated: July 28, 2026
1. Data We Collect
CheckReaction is a static website. We do not run a backend server or database. We collect minimal data through:
- Google Analytics 4 (GA4): Anonymous usage statistics — page views, session duration, device type, and geographic region (country-level only). GA4 does not collect IP addresses or personally identifiable information by default.
- Local Storage: Your reaction time test history (last 100 results) is saved in your browser's localStorage. This data never leaves your device.
2. Cookies
GA4 uses first-party cookies (_ga, _ga_*) for session measurement. These contain anonymous client IDs, not personal information. You can block cookies in your browser settings without affecting the games or tests.
3. Advertising
We use Google AdSense to display advertisements on this site. Google and its partners use cookies to serve ads based on your prior visits to this or other websites. You can opt out of personalized advertising by visiting Google Ads Settings or www.aboutads.info. For more information, see Google's Privacy & Terms.
Third-party vendors, including Google, use cookies to serve ads based on prior visits. Google's use of advertising cookies enables it and its partners to serve ads based on your visit to this site and other sites on the Internet.
4. How We Use Data
GA4 data helps us understand which tools and content are popular, which countries our visitors come from, and how people discover our site. We use this to improve content and prioritize new features.
5. Your Rights
Since we collect no personal data, there is nothing to request access to or delete. You can clear your localStorage at any time through your browser settings. To opt out of GA4 tracking, use a browser extension like uBlock Origin or enable "Do Not Track" in your browser. To opt out of personalized advertising, visit Google Ad Settings or youronlinechoices.com.
6. Children's Privacy
CheckReaction provides cognitive training tools suitable for general audiences. We do not knowingly collect personal information from children under 13. Our tools are not specifically directed at children. We have disabled personalized advertising to avoid interest-based ad targeting.
7. Contact
Questions about this policy? Contact us.