Help. Updated October 2, 2026
Underbook help center
Short answers about the Underbook browser extension and the web price checker. Each answer starts with the short version, then gives the detail and links to the page that goes deeper.
Each store updates Underbook on its own schedule, so for a while Chrome, Edge and Firefox can run different versions. Where an answer depends on the version, it says which; your browser's extensions page shows yours (Details in Chrome and Edge, about:addons in Firefox).
Getting started
What it does, where it works, pinning the icon, phones.
Prices and rooms
Where prices come from, same room name, all-in, and why prices differ.
Price alerts and watching a booking
Emails when a stay gets cheaper, watching a booked stay, and stopping them.
Privacy and data
What a check sends, what stays on your device, and deletion.
Money and trust
Commissions, what the extension can access, and lower prices that disappear.
Troubleshooting by browser
Settings to check in Chrome, Edge and Firefox, and removing it.
Not answered here?
Write to hi@underbook.co. Questions, requests to delete your data and reports of something wrong all go there.
The longer explanations: how Underbook works, and how to check us, the privacy policy and the corrections log. No extension? The web price checker runs the same comparison on any phone or computer.