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11. Roomer
If you ever had to hastily change your plans during a vacation, then you know the pain that comes with eating your hotel cancellation fees. But Roomer changes that. You can list your room on the app and see if someone wants to take over your reservation, meaning you'll get a full refund and won't have to deal with fees.

The same goes the other way, too. You can often times find discounted rooms if you take someone's cancellation off of their hands.