Some of your members are going to quit, there is no way around that. There are only few people who keep training BJJ for their whole life. Injuries happen, life gets in the way or they simply move on to something else.
But a lot of people who stop showing up never intended to quit. They tell themselves that they will come back to training soon, but they don't. They keep putting it off and they procrastinate. The longer someone stays away from training, the harder it is for them to come back to training.
BJJ Manager is built.... It is much cheaper and easier to retain a member compared to signing up a new one.
A piece of software can't make your classes and academy environment better. But it can make it easier to stay in touch with your members and to make sure that no one falls through the cracks.