Good idea in principle, appears to be well executed, but this must not be a service. Just because it can be made into one, it doesn't mean it should be. No rea

Good idea in principle, appears to be well executed, but this must not be a service. Just because it can be made into one, it doesn't mean it should be. No reason whatsoever why this can't be a locally hosted offline web app that uses local storage for its state. I can see some people wanting to do their exercises using several devices and for that an optional syncing service would make sense, but adding a permanent online dependency for what is inherently an offline app operating with local data makes zero sense. Even if it were free.