Privacy Policy

Your answers and results

Generating digits, scoring and calculating your history all happen in JavaScript inside your browser. The digits you type and your results are never sent to a server.

Browser storage

Your theme, last settings and test history (date, settings, longest span, number of tries) are stored in this device's localStorage. You can delete them at any time with "Clear history" on the test page or in your browser settings.

Speech synthesis (listening mode)

Listening mode reads digits using your browser's Web Speech API. Most devices use voices installed locally, but some browsers' online voices may send the digits to be read to the voice provider's servers. This is governed by your browser provider's policy.

Ads and cookies

Kakao AdFit ads may be shown to support the site. Ad providers may use their own cookies or similar technologies to serve and measure ads, subject to their own privacy policies.

Offline cache

To load faster on return visits, a service worker caches only static files such as styles and scripts. Your answers and history are not cached.

Contact

For privacy questions, please use the email address on the Contact page.