Add Underbook to your browser

Underbook is a free browser extension. On a hotel page with your dates, it shows whether another booking site lists the same stay for less, and whether that price names the same room. Pick the store for your browser.

The three stores

• Chrome Web Store For Chrome, and for Brave, Opera, Vivaldi and other browsers that add extensions from the Chrome Web Store.
• Microsoft Edge Add-ons For Microsoft Edge.
• Firefox Add-ons For Firefox on a computer or an Android phone.

On a phone, a tablet or Safari

The extension runs in Chrome, Edge and Firefox on a computer, and in Firefox on Android. Anywhere else, the web price checker runs the same check with no install.