Privacy Policy
Left Hand Trainer ("we", "us") is a free, browser-based reaction trainer for PC gamers. This policy explains what we collect, why, and the choices you have. You can use the trainer anonymously — we do not require an account.
Your gameplay stays on your device
Your scores, streaks, reaction times, settings and personal bests are stored only in your browser's local storage on your own device. They are not uploaded to us. Clearing your browser data erases them.
Global leaderboard (optional)
After a round you may choose to submit a score to the public global leaderboard. Only if you click Submit do we store: the display name you type, your score and game stats (mode, accuracy, time), and your country. The country is derived from your network location at the country level only — we do not store your IP address or any more precise location. This information is shown publicly on the leaderboard, so please do not enter your real name or any personal information as your display name. Leaderboard data is stored using Supabase, our database provider. To have a leaderboard entry removed, contact us (see below).
Cookies and consent
We use cookies and similar technologies for two purposes: analytics (to understand aggregate traffic) and advertising (to keep the site free). Where consent is legally required — for example for visitors in the European Economic Area, the UK and Switzerland — we use a Google-certified consent management platform, which asks for your consent before any analytics or advertising cookies are set and records your choice. You can review or change your choice through the consent options presented to you, and you can manage ad personalization at any time in Google Ads Settings. Strictly necessary storage needed for the site and your local scores is always active.
Analytics
Subject to your consent, we use Google Analytics 4 to measure aggregate, anonymous traffic such as page views and country-level location. We do not use it to identify you. You can learn more in Google's Privacy Policy.
Advertising
Subject to your consent, we use Google AdSense to display ads. Google and its partners may use cookies to serve ads based on your visits to this and other sites. You can opt out of personalized advertising in Google Ads Settings, or learn more at Google's partner-sites policy. This information does not include your name, address, email or phone number.
Hosting
The site is hosted and delivered through Cloudflare, which processes standard technical request data (such as IP address and browser type) to deliver and secure the site, and provides the country signal used for the leaderboard flag.
Your choices and rights
Depending on where you live (for example under the EU/UK GDPR or the CCPA), you may have the right to access, correct or delete personal data, and to withdraw consent. You can: manage cookie consent via the "Cookie settings" link; opt out of personalized ads via Google Ads Settings; clear your local data by clearing your browser storage; and request removal of a leaderboard entry by contacting us. We honor valid requests as required by law.
Children
This site is not directed to children under 13 (or the minimum age in your country), and we do not knowingly collect personal information from them. Please do not submit personal information in the leaderboard name field.
Data retention
Leaderboard entries remain until you or we remove them. Analytics data is retained according to Google's default retention settings. Local data persists on your device until you clear it.
Changes to this policy
We may update this policy from time to time. Changes are posted here with a new "Last updated" date.
Contact
For privacy questions or to request removal of leaderboard data, reach us through the support options on our About page.