Priceline has studied its mobile numbers and come up with a facility to book hotels on the same-night of the stay.
The Tonight-Only tool, which is available for iPhone and iTouch, has echoes of Hotel Tonight - an app-only business launched last year by DealBase chief Sam Shank.
Priceline says it developed the app on the back of research showing that 70% of its mobile customers are booking hotels on the same day.
The online travel agency is claiming a first with the tool, which has been bundled into its existing hotel and car rental negotiator app.
Tonight-Only provides exclusive room deals for hotels in 34 cities across the US.
The service works by searching for hotels' published prices while simultaneously looking for same night deals and then alerts the travellers of what is available.
Users are then provided with a list of three available hotels per city.
The launch of Tonight-Only comes after an iPad app unveiled by the OTA earlier this month and, which has been updated with the same functionality.