Install the Chrome Extension
Crosscheck runs as a Chrome extension (it also works in Chromium browsers like Edge, Brave, and Arc — Firefox and Safari aren't supported yet). Installing takes about 30 seconds.
Add it to Chrome
Open the Chrome Web Store listing and click Add to Chrome, then Add extension to confirm.
Pin it (optional)
Click the puzzle-piece icon in the Chrome toolbar and pin Crosscheck so it stays one click away.
Sign in
Click the Crosscheck icon and choose Sign Up or Login — both open the web app where you can continue with Google or your email.
Troubleshooting
Don't see the icon? Pin it from the puzzle-piece menu, or check that Crosscheck is enabled at chrome://extensions.
Can't create a check? Some pages block extensions — Chrome internal chrome:// pages, the Chrome Web Store, and other extension popups. Try a regular web page, or see the Extension Issues guide.