Even after you’ve bought and paid for your vacation, you may get a welcome surprise if you use these travel apps.

  • Tingo will rebook a confirmed, nonrefundable hotel reservation for you as prices drop. You can choose only from the hotels it’s selling on its site. It alerts you if a higher room category becomes available for the same rate or less than your original room.
  • DreamCheaper also rebooks your room when prices drop, and you don’t have to make your original reservation with it. Book your room on any website, then forward your booking confirmation to hotel@dreamcheaper.com. The company says it can save travelers up to 60 percent off the original price.
  • HotelTonight is what many savvy travelers swear by for last-minute hotel deals. Like crazy-good deals. The closer to the stay date, the better deals you’ll find. Like $100 off, and it’s user-friendly.