TidyCal

I was with Vcita. Great planner but very expensive (even the basic version) especially as I don't use all the features.
So I was very happy to buy and use TidyCal. It looks so clear and is so much cheaper. But, using it, I realized that Vcita allowed me to do a lot of things that I can't do in TidyCal: modify time slots over a given period, give an appointment to a customer in a closed time slot (with tidycal, to do that you have to create a link in the connected calendar and send it to the customer so that they can make the appointment themseves ... too complicated), and therefore also display the week with all possible slots, including those closed to the public, etc.
So I went back to Vcita.
But if Tidycal improves or if I find something much more flexible and cheaper than Vcita, I won't hesitate!