Free extension for Chrome, Edge and Firefox
Is there a browser extension that compares hotel prices?
Yes, several free ones.
Yes. Several free browser extensions, among them Hotel Ninja, Directo, RatePunk and Underbook, read the hotel and dates on the booking page you are viewing and show what other booking sites charge for that stay, with no new search. Underbook runs on Chrome, Edge and Firefox, checks every booking site Google Hotels lists for your dates, all-in where the sites report taxes and fees, and says whether a lower price names the same room.
In numbers
- Some site listed the stay 5% or more below the going rate at 4,822 of 6,663 hotel prices (72%); at 4,044 of those (84%) the lowest listing named no room.
- A lower listing whose room name matched the room at the going rate turned up at 538 of 6,239 hotels (8.6%), in the 15 snapshots that compared room names.
- Google Hotels listed a median of 17 booking sites per hotel (our 14 price snapshots of September 25 to October 1, 2026); Underbook checks every site it lists for your stay.
Source: our hotel price study, 16 snapshots of September 22 to October 3, 2026 in 358 cities, Google Hotels' prices for a US searcher in US dollars. What the other extensions check comes from each one's own site and store listing, read October 5 and 6, 2026, in the table below.
Free, no account needed to compare. You always book wherever you choose.
The extensions travelers name, side by side
The room check matters: in our study of 6,663 hotel prices, some site listed the stay 5% or more below the going rate at 72% of hotels, but at 84% of those the lowest listing named no room. Each of these extensions is free and works on the hotel page you already have open. They differ in which browsers they install on, which sites they check, what they say about the room, and how they are paid. What each says about itself comes from its own site and store listings, read on October 5, 2026 (vsHotel and the Booking.com price tracker on October 6, 2026); they can change, and a correction is welcome.
| Extension | Where it installs | What it compares | The room | On a phone | How it is paid |
|---|---|---|---|---|---|
| Underbook | Chrome Web Store, Microsoft Edge Add-ons, Firefox Add-ons | Every booking site Google Hotels lists for your stay (a median of 17 per hotel in our data), the hotel's own site included when listed; all-in where the sites report taxes and fees, otherwise marked as the listed rate | Says whether a lower price names a room matching the room at the going rate; otherwise says to check the room | The web price checker, no install | May earn a commission if you book through its link, which never changes the order of prices |
| Hotel Ninja | Chrome Web Store, the store its site links (no Firefox Add-ons listing found) | Booking.com, Expedia, Hotels.com, Agoda, Travelocity and Orbitz; final prices with taxes and fees, its site says | Says it shows the same room type | None named on its site | Not stated on its home page or store listing |
| Directo | Chrome Web Store and Firefox Add-ons; its site also names Edge, Brave and Opera | Booking platforms and hotels' official websites, over 2.4 million properties, beside its own Directo Deals rates | Not stated on its site or listing | Safari on iPhone, in beta | Offers its own negotiated rates, Directo Deals; its site does not say more |
| RatePunk | Chrome Web Store (as RatePunk Hotel Booking Deals) and Firefox Add-ons | Booking.com, Hotels.com, Expedia, Priceline, Agoda, Trip.com, Orbitz and Travelocity | Says it compares the same room | The apps on its site are for flight deals | Affiliate commissions, its Chrome Web Store listing says |
| vsHotel | Chrome Web Store (no Firefox Add-ons listing found); the listing names Directo Tech, Inc., the developer Directo's listing names too | Booking.com only: a small popup with the hotel's own website price beside Booking.com's, its listing says | Not stated on its listing or site | None named on its listing or site | May earn affiliate commissions through its links to booking sites, its listing says; no price on the listing |
| Booking.com price tracker | Chrome Web Store, from AiPrice (no Firefox Add-ons listing of that name found); its listing says it is not created, sponsored or endorsed by Booking.com | No other site: a chart of Booking.com's own past prices for a room on Booking.com hotel pages; how much history there is varies by hotel, date, room type and currency, its listing says | A price history for the room you click; no other site's room | None named on its listing | Not stated on its listing; no price on the listing |
Sources, read October 5, 2026: hotel-ninja.com and its Chrome Web Store listing (version 2.2.0, updated March 26, 2026); getdirecto.com and its Chrome Web Store listing (updated October 2, 2026); RatePunk's Chrome Web Store listing (updated April 21, 2026) and Firefox Add-ons listing (updated January 7, 2025); a Firefox Add-ons search for each name. Two more you may see named: PriceMice, from NordVPN, checks whether the same stay is priced lower for visitors in another country, and you then book with a VPN or a changed location; @Hotel, from Tripscout, compares rates while you browse and earns affiliate commissions (their Chrome Web Store listings).
Sources, read October 6, 2026: vsHotel's Chrome Web Store listing (version 3.2.1, updated October 2, 2026, 100,000 users) and vshotel.org; the Booking.com price tracker's Chrome Web Store listing (version 4.0.2, updated July 11, 2026, 10,000 users); Directo's Chrome Web Store listing, for its developer's name; a Firefox Add-ons search for each name. What the two listings declare about data: the Booking.com price tracker handles website content, vsHotel says it does not collect or use your data, and both say data is not sold to third parties. Others named in travelers' lists, from their own listings or sites read the same day: CheaperThere, from Binary s.r.l., checks hotels on Booking.com only for now and uses affiliate links; Pop in Hotel, from EASY POP UP, says it negotiates a lower price than the one Booking.com shows (its listing is in French); HiChee, from SHAKACODE, compares vacation rentals on Airbnb, Booking.com and Vrbo; Room Steals offers a free extension for Chrome and a membership at $17 a month or $95 a year; Deal Miner's listing was last updated June 11, 2025.
Using Hotel Ninja and wondering what else is out there? Hotel Ninja alternatives, compared. One link for any browser: underbook.co/get opens the right store for Chrome, Edge or Firefox, and the web price checker on a phone.
What it does on a hotel page
Open a hotel on a booking site as you normally would. The extension reads the property and the dates already on screen, then asks what the other sites are charging for that same stay. A single banner appears with the answer. There is no separate tab, no second search to retype, and no form to fill in.
Every site Google Hotels lists
Mainstream booking sites alongside the discount resellers that usually hold the lowest listed number.
All-in, not headline
Compared with taxes and fees included where the source reports them, because the nightly rate on the page is often not what you pay at checkout.
Flagged, not hidden
If the cheaper listing does not name the room it is selling, the banner says so instead of presenting it as a like-for-like win.
How often a lower price turns up
Here is the full distribution from our hotel price study, 6,663 hotel prices in 358 cities across 16 snapshots from September 22 to October 3, 2026, priced with the same rules the extension runs. Method and per-hotel data are on the hotel price study.
| What the comparison found | Share | What it means for you |
|---|---|---|
| A cheaper listing, no room named | 60.7% | Something is cheaper, but the listing does not say which room. Worth opening, worth checking before you pay. |
| No site 5% or more below the going rate | 27.6% | You likely already have a fair price. Stop shopping and book. |
| A cheaper listing that names a room | 11.7% | Naming a room is not proof it is the same one. The extension compares the names; in the 15 snapshots that compared room names, a cheaper listing matched the room name at 8.6% of hotels. |
Read that second row again. At about one hotel in four, no site was 5% or more below the price most sites agreed on, so the useful answer is that the price you see is already the going rate. Ask any extension whether it tells you that, and whether it says when a lower price names a different room.
Checked, October 1 to 3, 2026
Does the price it shows hold when you click through?
On October 1, 2026 we asked Underbook's price service about 19 stays, the way the extension does, and opened the listing it would show through its own link, 11 to 37 seconds later. Two stays came back with no prices, so 17 pages were opened. 11 could be read: at 9 the page showed our price within 1.5%, on the same tax basis; at 2, both Agoda, it showed a higher price before tax (+5.6% and +11.7%), on offers Google had priced for visitors in another country. None of the listings was gone. 6 pages could not be read (bot checks on Super.com and Expedia, and two hotels' own booking pages).
In two larger audits on October 2 and 3, 2026, 40 of the 44 readable booking-site pages showed the price within 2%: is Google Hotels accurate?
So the price shown was usually the price on the page. The misses we saw were prices set for another country's visitors, members-only prices, one lower price on the page and one price shown before tax. A look at the total on the booking page before you pay settles it.
17 listings is a small count: read it as a direction, not a rate. The stays came from the hotel price study.
Why the cheapest number is so often not a deal
On a typical comparison, the mainstream booking sites cluster tightly at one price and publish exactly which room they are selling. The sites well below them are usually reselling wholesale inventory, and they frequently publish no room name and no cancellation terms at all.
So a large apparent discount is often not the same product. It can be a smaller room, a non-refundable rate, or a booking the hotel has no record of until you arrive. That is not a reason to never use those sites. It is a reason to know which kind of number you are looking at before you click.
This is the entire reason the banner distinguishes between a cheaper listing whose room name matches and one it cannot match. Collapsing those two into one cheerful "you saved" message would be the easy thing to build, and it would be dishonest.
How this differs from the comparison sites
Metasearch sites like trivago, Kayak and Google Hotels do compare prices, and they do it well. The difference is where the comparison happens. They require you to leave what you are doing and search again in their interface, which is also an interface with commercial ranking in it.
An extension inverts that. The comparison comes to the page you already chose, for the dates you already picked, and then gets out of the way. There is no ranked list to scroll and no sponsored row at the top.
The tradeoff is honest to state: a metasearch site can show you hotels you have not thought of, and an extension cannot. It only answers one question, which is whether the hotel in front of you is priced well.
If you already booked
Comparison only helps before you pay. After that, the useful move is watching. If you booked a refundable rate, a later price drop is money you can still recover by rebooking at the lower rate and cancelling the old reservation.
Underbook can watch a stay and email you once if the going rate for your dates is at least 5% lower on two daily checks in a row. That part needs an email address and nothing else, and it works without installing the extension at all.
Watch a hotel price, freeCommon questions
Is there a browser extension that compares hotel prices?
Yes. Free extensions such as Hotel Ninja, Directo, RatePunk and Underbook show what other booking sites charge for the hotel and dates on the page you are viewing. Underbook installs on Chrome, Edge and Firefox, checks every booking site Google Hotels lists, all-in where the sites report taxes and fees, and says whether a lower price names the same room; on a phone, its web price checker does the same check with no install.
Is there a Honey for hotels?
Honey itself does not compare hotel prices, going by its own pages read October 6, 2026. PayPal Honey looks for coupon codes as you shop: its home page names booking travel among the places it looks, and its help center says hotel and other travel reservations can earn PayPal Rewards points, which clear only once the stay is completed. Its price-drop list, Droplist, works on select stores such as Amazon, Macy's, Target and Walmart. None of those pages, nor its Chrome Web Store listing, says it compares a hotel's price across booking sites. The extensions in the table above do that, Underbook among them: on the hotel page you are viewing, it shows the price each booking site lists on Google Hotels for your dates, all-in where the sites report taxes and fees, and says whether a lower listing names the same room. It does not look for coupon codes.
How often does it find a lower hotel price?
In our hotel price study (16 snapshots from September 22 to October 3, 2026, 6,663 hotel prices in 358 cities), priced with the same rules the extension runs, some site listed the stay 5% or more below the going rate at 4,822 hotels (72%), typically 16.7% below. At 4,044 of those 4,822 the lowest listing named no room, and at 1,841 hotels (28%) no site was 5% or more below the going rate. In the 15 snapshots that compared room names, a lower listing whose room name matched turned up at 538 of 6,239 hotels (8.6%). A lower number usually exists; whether it buys your room is usually unknown.
Does the extension work on every booking site?
It works on mainstream hotel booking pages where the property and dates can be read from the page. It deliberately does nothing on search result pages, on sites where it cannot identify a single property with confidence, and on short-term rental listings, which are not hotel inventory and cannot be priced against hotel sources.
What data does it collect?
The hotel name and dates on the page are sent to our own service to run the comparison. There is no account, and comparing requires no email address. If you choose to watch a price, that email is used only for emails about that stay (at most one of them a drop alert) and nothing else.
Do you get paid when I book?
Some booking links can carry an affiliate parameter, which is the normal arrangement in this category. It does not change which price is shown lowest, because the listings are sorted by the price each site reports. The result you see would be identical either way.
Will it slow down the page?
The comparison runs after the page loads and renders as a single banner. It does not modify the booking site's own content or interfere with the checkout you are using.
Is there a browser extension that tracks hotel prices over time?
Comparing and tracking are two different jobs and it is worth being clear about which you need. Comparing answers "is this price good right now" and happens in one shot on the page. Tracking answers "did it get cheaper since I booked" and has to keep watching for days or weeks. Underbook does both, but the tracking runs on our side and emails you, rather than requiring the browser to stay open. That means a price drop still reaches you on a day you never opened your browser.
Is it really free?
Yes. There is no paid tier, no trial and no account. If that changes, it will be said plainly here rather than discovered at a paywall.
Real prices, hotel by hotel
Every site's price at 5,814 hotels in 358 cities
From our price snapshots of September 25, 2026, September 28, 2026, September 29, 2026, September 30, 2026, October 1, 2026 and October 3, 2026: each hotel's page lists every booking site Google Hotels showed, the going rate, and whether the cheapest listing named a room, with a button to check today's price for your own dates.
By region: United States · Europe · Canada, Latin America, Caribbean · Asia-Pacific, Middle East, Africa
Start with a city: New York · Las Vegas · Orlando · Chicago · London · Cancun · Los Angeles · Miami · Fort Lauderdale · Nashville · New Orleans · Paris · Punta Cana · San Francisco · Honolulu · Charleston · Key West · Washington DC · Boston · Atlanta · Scottsdale · Myrtle Beach · Austin
Check the price without leaving the page.
Underbook compares every booking site Google Hotels lists for the hotel you are already viewing, all-in where the sites report taxes and fees, and tells you plainly when there is nothing cheaper to find. Free, no account, and you always book where you choose.
Add to Chrome, free