Their own pages, read Oct 27, 2026

Is there a hotel price tracker that emails you when the price drops?

Yes, several: Google Hotels emails signed-in users when a tracked hotel's rates change significantly, KAYAK sends Price Alerts, trivago's app has price drop alerts, and Underbook's free checker emails when your stay's going rate drops 5%. Run on our 2026 daily prices for 12 US hotels, that rule fired at 7 of them.

To check your own stay today, Underbook's free hotel price checker shows the price each booking site lists on Google Hotels for that hotel and dates, and whether a lower listing names the same room, and it can email you if the going rate for that stay drops: https://underbook.co/hotel-price-checker.

+ Add to Chrome, free or check a hotel's price without installing →

Free. No booking site paid for this page. If you book through Underbook we may earn a commission, which never changes which rate we show.

What each tracker says it does

Quoted from each one's own pages, read October 27, 2026.

Google Hotels

Since its post of April 17, 2026: "you can now track prices for individual hotels, too"; "look up a specific hotel by name, then tap the new price tracking toggle"; "you’ll get an email alert if rates change significantly during your chosen dates". "Price tracking for individual hotels is now available globally for signed-in users in English and Spanish."

Google, 7 ways to travel smarter this summer (April 17, 2026), read October 27, 2026.

KAYAK

For a hotel search: "Click “Set Price Alert” at the top right of the hotel results list". "Most Price Alerts are sent once a day." "We bundle all your active alerts into one email or push notification, usually sent in the early morning." For real-time alerts: "These trigger when there’s a significant price change, typically a 10% increase or drop, since your last update."

KAYAK help, Pricing and Price Alerts, read October 27, 2026.

trivago

"Now you can sign up for price drop alerts on the trivago app to stay on top of price changes for your favorite hotels."

trivago on the App Store (seller trivago N.V.), read October 27, 2026. trivago.com, its help center and its company site answered our requests on October 27, 2026 with an error (HTTP 403), so the only trivago source here is its App Store listing.

Underbook (us)

"We check the going rate for this hotel and these dates once a day and email you if it is at least 5% lower on two daily checks in a row." No account is needed, and one click in an email stops them. It watches the going rate across the booking sites Google Hotels lists, not one site's price.

The price checker and Help: price alerts.

Measured, June 3 to July 25, 2026

How often a 5% drop alert would have written

Our earlier price watcher read the going rate for one stay, July 25 to 28, 2026, at 12 US hotels once a day from June 3. Run with the checker's rule (5% below the first read on two daily reads in a row):

The alert fired at 7 of the 12 hotels; with a 10% line, at 6.
At 8 of the 12 the last read was more than 2% above June 3, and 3 of them had fired an alert on the way: an alert is a moment to act, not a trend.
Across 608 hotels priced twice a week apart for the same stay, the going rate fell 5% or more at 160 of 608 (26%) and rose 5% or more at 236 of 608 (39%).

So any of these alerts will catch real drops. What turns a drop into a lower price is a refundable booking you can cancel after you rebook.

Twelve hotels and one summer stay: a direction, not a rate. The week-later pairs are from the hotel price study. Full method: do hotel price alerts work?

What Underbook does differently

Underbook is built on the same list: for your hotel and dates it reads the booking sites Google Hotels lists (a median of 12 per hotel in our 16 price snapshots of September 25 to October 10, 2026). It does not search anywhere else. What it adds are three checks, with what they found in those snapshots (6,620 hotel prices):

Whether the lower price names the same room. At 4,783 of 6,620 (72%) hotel prices a listing was 5% or more below the going rate, typically 17% below. That listing named a room at 775 of 4,783 (16%), and named the same room as a listing at the going rate at 571 of 4,783 (12%). Underbook says which: "same room name", or that the lower listing needs a check before you book.

Taxes and fees as each site reports them. It shows each price all-in where the sites report taxes and fees (a resort or destination fee may be extra). That matters because sellers report differently: where taxes added 10% or more, KAYAK's listed price sat near the before-tax rate at 37% of hotels, Booking.com's at 8%.

The hotel's own site beside Booking.com. Google Hotels listed the hotel's own site at 4,425 of 6,620 (67%) hotel prices. Like with like against Booking.com, the hotel's site was more than 2% lower at 26% of 3,345 hotels and Booking.com at 13%; within 2% at 61%.

One email for the stay, across sites. Its price-drop email follows the going rate, the price most booking sites list for your stay, so one site's promotion does not trigger it alone; when it writes, the checker shows each site's price and whether a lower listing names the same room.

How to make a price alert pay off

Book a refundable rate and note its free-cancellation deadline.
Set one alert for that hotel and those dates (Google Hotels, KAYAK, trivago or Underbook).
When it writes, open the lower price and match the room, the cancellation terms and the total.
Book the lower rate first, then cancel the first booking before its deadline.

Checking your own stay

Underbook is a free browser extension for Chrome, Edge and Firefox, and a free web price checker. For a hotel and dates it shows the price each booking site lists on Google Hotels, all-in where the sites report taxes and fees (a resort or destination fee may be extra), and says whether a lower listing names the same room or needs a check before you book. You always book on the site you choose. Its price-drop email checks the going rate once a day and writes when it drops at least 5% on two daily checks in a row. No account.