Probably the worst(?) experience I've ever had with a travel app. The "price freeze" is a joke. I had to hound them for 7 days to get them to honor their own offer. When you go to check out the price jumps EVERY TIME. Every step is laden with add on, nickel and diming everywhere. On the last step they have the absolute gaul to assume a tip. It's automatically set to tip, you have to uncheck it yourself. Dreadful, absolute trash. Fun Update! March 21st, 2020. After a tidy back and forth with Hopper customer support it turns out that 1. Hopper described how they were unable to honor the Kayak lowest cost fares because according to Hopper "Kayak is displaying what is called a Hacker fare which can only be obtained through unethical ticketing practices" (direct quote) and 2. No matter how we went back and forth the simple fact is, it is my fault in assuming that a "price freeze" would, in fact, create a scenario wherein I could purchase tickets inline with the pricing I placed a holding fee to "freeze". So obvious, 'freeze" doesn't mean freeze. Don't I feel stupid?