Clockwise is an intelligent calendar assistant that will automatically move meetings to open up the most Focus Time for everyone. It also has a scheduler which will find the best time for a meeting automatically while respecting users' preferences.
The only difference I can see from the description is the meeting priority inference, which you get with a paid plan. Clockwise is currently free.
Sorry for the confusion - our paid product does more than just meeting priority inference, it allows you optimize meeting room utilization and is targeted to companies to help them better utilize office space.
We launched this free version with a subset of features since some things (like room utilization) don't make sense for an individual. We're looking to port over more features as we get adoption & based on demand. Our priority inference also works a little differently than clockwise -- there's no step of marking meetings as flexible, that happens automatically at scheduling time based on your urgency
The only difference I can see from the description is the meeting priority inference, which you get with a paid plan. Clockwise is currently free.