"Beta mode" refers to a stage or version of a product or software that is still being tested before it is released to the public. It is a way for developers to gather feedback and fix any issues or bugs before the final release. Full definition
They were launched in beta mode as we were testing the mechanism and were also looking for your comments on the interface and functional characteristics of the feeds. (datingfactory.cz)
We have left feeds in beta mode for the next couple of weeks — so any further ideas or suggestions are welcome! (datingfactory.cz)
It will be an invite only gameplay time at the beginning but later on, in order to test the stability of their servers, Battlefield 1 will go into open beta mode. (nashvillechatterclass.com)