Whether you want to extend your vacation or need a place to crash for the night, Hotel Tonight can help you out. The app offers quick and easy same-day hotel room bookings (until 2 a.m.) in 12 countries and more than 100 destinations. You can stay for one night or more, and with a best-rate guarantee you'll know that you are paying the lowest price. Take note, though, that these deals aren't available until noon on the day that you want to book. If you like your accommodations, you can take pictures and add them to the app using the "Snap Your Stay" feature. Hotel Tonight is available for Android, iPhone and iPad.