An alpha release, the first stage of testing for new software, is generally an early version that may contains bugs and unfinished features. It could still change a lot. Expect it to be less polished than later versions. There's also a chance that an alpha feature will not progress to general release if Triptease discovers that the feature is not viable or valuable to our hotelier customers.
A beta release is a preliminary version of software or a product that's made available to a select group of users for testing and feedback before a full public release. It will be more polished and feature complete than an alpha release, but you might come across some bugs or incomplete features, and some things could still change.
By taking the opportunity to get early access to new features in either an alpha or beta release you'll have a chance to take advantage of new functionality that can drive direct bookings before anyone else. You'll also have the chance to influence the final product by providing feedback direct to the Triptease product team.