What are some alternatives?
When comparing Tripping and KAYAK, you can also consider the following products
Rendezvous by Kayak - Find cheapest place to meet at from different departures
Skyscanner - Skyscanner.com compares over 1000 airlines to find you the cheapest airfares, fast.
MEETplnr - Organize meetups in your chat groups with ease
Google Flights - Find cheap flights in seconds, explore destinations on a map, and sign up for fare alerts on Google Flights.
Tinder Stacks - Make decisions with your friends with a swipe in iMessage
Momondo - Find cheap flights with Momondo.