Reaction Lab is a browser-based game site. You do not need to create an account or provide your name to play the games.
Some game preferences and scores are stored locally in your browser so features such as themes, personal bests and Aim settings can work between visits.
Reaction Lab may use browser storage such as localStorage for things including:
This browser-local information can normally be removed by clearing site data in your browser.
Reaction Lab uses Google Analytics 4 to understand general site usage, such as which pages are visited and how the site is used. Where required, privacy and consent choices are handled through Google's certified consent-management platform (CMP).
Google Analytics may process information such as page visits, device/browser information, interactions and approximate location information, subject to Google's own terms and privacy practices.
You can continue to use the games even if you do not consent to optional Analytics or advertising storage.
Reaction Lab includes Google AdSense code and may display ads when Google approves and enables ad serving for the site. Whether personalised or non-personalised advertising can be used depends on applicable law, Google settings and the choices you make through the consent-management platform.
Ads are intended to be kept away from rapid-click game targets and immediate replay controls to reduce accidental clicks.
When you complete a Reaction Lab test, the site keeps the result in your browser for your personal Stats history and also sends the test result to Reaction Lab's private results archive so site deployments do not erase the historical dataset.
The archive stores a random result ID, game mode, score, best and worst values where applicable, accuracy, difficulty, device-profile label, mode-specific result details, and result timestamps. It does not store a leaderboard nickname or country field. Public visitors cannot browse or read the private results archive through the site.
If a result cannot be uploaded immediately, the site may keep it in a browser-local retry queue and try again when the device is online.
Analytics, advertising and browser functionality can use cookies or similar local-storage technologies. Where consent is required, Reaction Lab uses a certified consent-management platform to request and communicate the relevant privacy choices.
Reaction Lab is a general-audience game site and does not require players to submit personal information to play. If you are below the age at which you can make privacy choices yourself in your country, use the site with the involvement of a parent or guardian.
You can use the Google consent message to make available Analytics and advertising choices where it is shown. You can also clear Reaction Lab's saved browser-local data through your browser settings.
This policy may be updated when Reaction Lab changes its analytics, advertising, result storage or site features. The current version was last updated on 26 August 2026.
For privacy questions, use the Contact page or email thelocalprojectlab@gmail.com.