Rezdy has been in the market since 2012, targeting tour operators and tourist activity providers. They have a really tight set of integrations with tourism sites with review functionality e.g. Trip Advisor integration. They in earnest do a good job of group bookings. However they are supremely expensive, ranging up to $250 per month and are severely complex. This is not software that can easily and quickly be setup.
Above we detail a comparison table of Rezdy with Cogsworth features based on a November 2018 review kindly facilitated by our users.
This is why sites like Capterra, Getapp, Finances Online are driving so many people to seek and find alternatives to Rezdy.