--- title: "Underbook: Hotel Price Comparison & Tracker for Booking.com & Expedia – Chrome extension stats, history and permissions" description: "69 users, no ratings yet. Version 0.5.67, updated 2026-11-05. Requests 6 permissions." url: "https://extensiontracker.com/extension/bfkhcloifkimjimedcijpenafnkfibid" --- # Underbook: Hotel Price Comparison & Tracker for Booking.com & Expedia Live in the Chrome Web Store. - Users: 69 - Rating: no ratings yet - Last checked: 2026-11-06 05:33 UTC - Users gained in 7 days: +14 - Users gained in 30 days: +44 (+176.0%) - Rank by users: #76,640 of 289,025 live extensions - Rank in Travel: #157 of 962 ## The listing What the Chrome Web Store shows, as of the last check. Summary from the listing: > Compare hotel prices on Booking.com, Expedia & Hotels.com. See if room names match. Free price-drop alerts, even after you book. - Extension ID: `bfkhcloifkimjimedcijpenafnkfibid` - Developer: [DPWonder Software](https://extensiontracker.com/developer/u53c913206696e86cbf9b2e55296a5cfa) - Enhanced Safe Browsing: Trusted ([what this means](https://extensiontracker.com/enhanced-safe-browsing)) - Category: [Lifestyle › Travel](https://extensiontracker.com/category/lifestyle/travel) - First published: 2026-06-03 - Last updated: 2026-11-05 - Version: `0.5.67` - Size: 411 KiB - Minimum Chrome: 88 - Languages (19): Deutsch, English, Indonesia, Nederlands, Tiếng Việt, Türkçe, español, français, italiano, polski, português (Brasil), português (Portugal), svenska, русский, עברית, 中文（中国）, 中文（台灣）, 日本語, 한국어 - Website: `https://underbook.co/` - Support page: `https://underbook.co` - Chrome Web Store: - View its code or download CRX: - Search Google for the ID: ## Users over time One row per check, newest first, as shown on the Chrome Web Store. | Checked | Users | Rating | Ratings | | --- | ---: | ---: | ---: | | 2026-11-06 | 69 | – | – | | 2026-11-03 | 64 | – | – | | 2026-10-29 | 55 | – | – | | 2026-10-27 | 54 | – | – | | 2026-10-25 | 52 | – | – | | 2026-10-24 | 54 | – | – | | 2026-10-16 | 39 | – | – | | 2026-10-14 | 36 | – | – | | 2026-10-11 | 34 | – | – | | 2026-10-08 | 25 | – | – | | 2026-10-07 | 25 | – | – | | 2026-10-06 | 25 | – | – | | 2026-10-05 | 25 | – | – | | 2026-10-03 | 19 | – | – | | 2026-10-01 | 19 | – | – | | 2026-09-30 | 19 | – | – | | 2026-09-29 | 19 | – | – | | 2026-09-28 | 19 | – | – | | 2026-09-26 | 20 | – | – | ## What changed Every change found on a check, newest first. - 2026-11-06: New version `0.5.67`, replacing `0.5.66`. - 2026-11-03: New version `0.5.66`, replacing `0.5.65`. - 2026-10-29: New version `0.5.65`, replacing `0.5.63`. - 2026-10-29: Renamed from “Underbook: Hotel Price Comparison for Booking.com & Expedia” to “Underbook: Hotel Price Comparison & Tracker for Booking.com & Expedia”. - 2026-10-29: The developer's website link changed. - 2026-10-27: New version `0.5.63`, replacing `0.5.61`. - 2026-10-25: New version `0.5.61`, replacing `0.5.60`. - 2026-10-25: Now listed in 19 languages, from 17. - 2026-10-24: New version `0.5.60`, replacing `0.5.55`. - 2026-10-16: New version `0.5.55`, replacing `0.5.53`. - 2026-10-16: Now listed in 17 languages, from 16. - 2026-10-14: New version `0.5.53`, replacing `0.5.49`. - 2026-10-14: Renamed from “Underbook: Hotel Price Comparison & Tracker” to “Underbook: Hotel Price Comparison for Booking.com & Expedia”. - 2026-10-14: Now listed in 16 languages, from 6. - 2026-10-11: New version `0.5.49`, replacing `0.5.48`. - 2026-10-08: New version `0.5.48`, replacing `0.5.43`. - 2026-10-08: Now listed in 6 languages, from 1. - 2026-10-07: New version `0.5.43`, replacing `0.5.42`. - 2026-10-06: New version `0.5.42`, replacing `0.5.40`. - 2026-10-06: The developer's contact email changed. - 2026-10-05: New version `0.5.40`, replacing `0.5.31`. - 2026-10-05: Moved from Shopping to Travel. - 2026-10-05: Added the sites `http://*/*`, `https://*/*`. - 2026-10-03: New version `0.5.31`, replacing `0.5.28`. - 2026-10-03: The summary on the listing changed. - 2026-10-01: New version `0.5.28`, replacing `0.5.26`. - 2026-09-30: New version `0.5.26`, replacing `0.5.24`. - 2026-09-30: The summary on the listing changed. - 2026-09-29: New version `0.5.24`, replacing `0.5.19`. - 2026-09-28: New version `0.5.19`, replacing `0.5.18`. ## Developer history Moves to another publisher account and new contact emails, newest first. - 2026-10-06: The contact email changed. We know contact emails only by a keyed hash, so they're never shown. Recent changes: [Account and contact changes](https://extensiontracker.com/owners/). ## What it can access From the extension's manifest, in plain language. **Every website:** it can read and change your data on all the sites you visit. ### Sites - `http://*/*`: Every website - `https://*/*`: Every website - `https://underbook-backend.underbook.workers.dev/*`: underbook-backend.underbook.workers.dev ### Sites where it runs scripts - `http://*/*`: Every website - `https://*/*`: Every website ### Browser features - `activeTab`: The tab you're on, only after you click the extension - `scripting`: Run scripts on sites it can reach - `storage`: Save settings and data in your browser ## More from this developer Other extensions from the same publisher account. | Extension | Users | Rating | Ratings | Category | | --- | ---: | ---: | ---: | --- | | [PromoIQ: Promo Codes, Coupon Finder & Price Comparison](https://extensiontracker.com/extension/cpmlbedpghihbphokfpmpdbkbhbkgnkj) | – | – | – | Shopping | All 2 extensions by [DPWonder Software](https://extensiontracker.com/developer/u53c913206696e86cbf9b2e55296a5cfa). ## About this data Collected from the extension's public Chrome Web Store listing. It's checked every month, and again whenever a new version appears. Last checked 2026-11-06 05:33 UTC; next check around 2026-12-05. How the data is collected: . ## Cite this page Extension Tracker. “Underbook: Hotel Price Comparison & Tracker for Booking.com & Expedia” (bfkhcloifkimjimedcijpenafnkfibid). Chrome Web Store data, last checked 2026-11-06. https://extensiontracker.com/extension/bfkhcloifkimjimedcijpenafnkfibid. Accessed 2026-11-08. ```bibtex @misc{extensiontracker_bfkhcloifkimjimedcijpenafnkfibid, title = {Underbook: Hotel Price Comparison & Tracker for Booking.com & Expedia (bfkhcloifkimjimedcijpenafnkfibid)}, author = {{Extension Tracker}}, year = {2026}, note = {Chrome Web Store data, last checked 2026-11-06}, url = {https://extensiontracker.com/extension/bfkhcloifkimjimedcijpenafnkfibid}, urldate = {2026-11-08} } ``` --- From Extension Tracker, a public record of the Chrome Web Store: . It isn't affiliated with Google. The data is free to reuse under CC BY 4.0 (), crediting Extension Tracker. Every page except search comes as Markdown too: add `format=md` to the address, as in `https://extensiontracker.com/extension/{id}?format=md`.