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Underbook: Hotel Price Comparison & Tracker for Booking.com & Expedia

Chrome extension by DPWonder Software · Lifestyle · Travel

  • Established publisher

A Chrome extension in Lifestyle · Travel with 64 users, barely installed. Audience over the last 30 days: +45.

Every site you visit. This extension can read and change the content of any page you open.

What the developer says, and 5 screenshots

Loading from the Chrome Web Store. Open the listing if it does not appear.

Users
64
Rating
not rated yet
Users, last 30 days
+45
Version
0.5.65
Updated in the store
2026-10-28
Published
2026-06-03
Manifest
V3
Browser access
3 permissions, 3 site patterns

How it has moved

Users
+45 since 03.10
19-64 · 19 readings
2026-10-03: released 0.5.312026-10-04: released 0.5.392026-10-05: released 0.5.402026-10-05: released 0.5.422026-10-06: released 0.5.432026-10-07: released 0.5.482026-10-13: released 0.5.502026-10-14: released 0.5.532026-10-16: released 0.5.552026-10-23: released 0.5.572026-10-24: released 0.5.602026-10-25: released 0.5.612026-10-27: released 0.5.632026-10-27: gained the good publisher record badge2026-10-28: released 0.5.65
  1. 2026-10-0425released 0.5.39
  2. 2026-10-0831
  3. 2026-10-0933
  4. 2026-10-1034
  5. 2026-10-1336released 0.5.50
  6. 2026-10-1639released 0.5.55
  7. 2026-10-1740
  8. 2026-10-1844
  9. 2026-10-1945
  10. 2026-10-2048
  11. 2026-10-2352released 0.5.57
  12. 2026-10-2454released 0.5.60
  13. 2026-10-2552released 0.5.61
  14. 2026-10-2654
  15. 2026-10-2853released 0.5.65
  16. 2026-10-2955
  17. 2026-10-3057
  18. 2026-11-0162
  19. 2026-11-0264
Users
+51 since 01.09
12-64 · 31 readings
2026-09-06: released 0.5.52026-09-13: released 0.5.62026-09-19: released 0.5.72026-09-22: released 0.5.82026-09-23: released 0.5.92026-09-24: released 0.5.122026-09-24: released 0.5.132026-09-25: released 0.5.142026-09-26: released 0.5.172026-09-27: released 0.5.182026-09-28: released 0.5.202026-09-29: released 0.5.242026-09-30: released 0.5.272026-10-01: released 0.5.282026-10-03: released 0.5.312026-10-04: released 0.5.392026-10-05: released 0.5.402026-10-05: released 0.5.422026-10-06: released 0.5.432026-10-07: released 0.5.482026-10-13: released 0.5.502026-10-14: released 0.5.532026-10-16: released 0.5.552026-10-23: released 0.5.572026-10-24: released 0.5.602026-10-25: released 0.5.612026-10-27: released 0.5.632026-10-27: gained the good publisher record badge2026-10-28: released 0.5.65
  1. 2026-09-0113
  2. 2026-09-0314
  3. 2026-09-0512
  4. 2026-09-0613released 0.5.5
  5. 2026-09-0815
  6. 2026-09-1014
  7. 2026-09-1316released 0.5.6
  8. 2026-09-1717
  9. 2026-09-2019
  10. 2026-09-2218released 0.5.8
  11. 2026-09-2520released 0.5.14
  12. 2026-09-2819released 0.5.20
  13. 2026-10-0425released 0.5.39
  14. 2026-10-0831
  15. 2026-10-0933
  16. 2026-10-1034
  17. 2026-10-1336released 0.5.50
  18. 2026-10-1639released 0.5.55
  19. 2026-10-1740
  20. 2026-10-1844
  21. 2026-10-1945
  22. 2026-10-2048
  23. 2026-10-2352released 0.5.57
  24. 2026-10-2454released 0.5.60
  25. 2026-10-2552released 0.5.61
  26. 2026-10-2654
  27. 2026-10-2853released 0.5.65
  28. 2026-10-2955
  29. 2026-10-3057
  30. 2026-11-0162
  31. 2026-11-0264

A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing up to 2 times a day and record a point only when something moves. History beyond ninety days is in the app.

What it can reach

Every site you visit. This extension can read and change the content of any page you open.

  • Run its own code on the pages it can access scripting
  • Act on the current tab, but only after you click it activeTab
  • Store data in your browser storage

The full permission history for this extension

Version history

  1. Version 0.5.65
  2. Version 0.5.63
  3. Version 0.5.61
Show the remaining 4
  1. Version 0.5.60
  2. Version 0.5.57
  3. Version 0.5.55
  4. Version 0.5.53

What changed recently

  1. Package size changed
  2. Store description rewritten
  3. Renamed from "Underbook: Hotel Price Comparison for Booking.com & Expedia" to "Underbook: Hotel Price Comparison & Tracker for Booking.com & Expedia"
Show the remaining 9
  1. Released version 0.5.65 (was 0.5.63)
  2. Store description rewritten
  3. Gained the Established publisher badge
  4. Package size changed
  5. Released version 0.5.63 (was 0.5.61)
  6. Package size changed
  7. Supported languages changed (17 → 19)
  8. Released version 0.5.61 (was 0.5.60)
  9. Package size changed

Older entries and the full day by day series are in the app.

The publisher

DPWonder Software publishes 2 listings we track, 74 users between them. Listed website: underbook.co.

  1. PromoIQ: Promo Codes, Coupon Finder & Price Comparison DPWonder Software · Lifestyle · Shopping · published 2025-12-24 10 users (last published figure)

Like this one

Listings the catalog judges closest in what they say they do.

  1. Hotel Deal Scanner for Booking, Expedia & Hotels.com Describes nearly the same job, smaller audience 18 users ★ 5.0
  2. Hotel Drop Describes nearly the same job, smaller audience 9 users
  3. day2daytrips — hotel price alerts Describes nearly the same job, smaller audience 7 users
  4. trip1: Compare Hotel Prices Describes nearly the same job, smaller audience 4k users ★ 5.0
  5. RatePunk Hotel Booking Deals Describes nearly the same job, with an established audience 50k users ★ 3.7

The top 5 only. The full comparison, with why each one is close, is on the alternatives page; ranking a whole neighbourhood by your own criteria is in the app.

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Users and rating on Ext Ops Panel

Markdown

[![Users and rating on Ext Ops Panel](https://extops.dev/extensions/bfkhcloifkimjimedcijpenafnkfibid/badge.svg)](https://extops.dev/extensions/bfkhcloifkimjimedcijpenafnkfibid)

HTML

<a href="https://extops.dev/extensions/bfkhcloifkimjimedcijpenafnkfibid"><img src="https://extops.dev/extensions/bfkhcloifkimjimedcijpenafnkfibid/badge.svg" alt="Users and rating on Ext Ops Panel" height="20"></a>

Figures come from our own regular passes over the public Chrome Web Store listing, last read on . The store last changed these figures on 2026-11-02. We publish no contact details for extension developers.

Where the data comes from: how the catalog is built