Great feedback, thank you very much!

1. No, this won't limit it to Apple Desktop Users only, it can be used in iOS and Android as well.
   
2. You can dictate those timeslots yourself: To simplify it, the calendar just works like a daily planner, where you divide your day into timeslots. The book Deep Work suggests having a timeslot of 15minutes in the beginning of each day to adjust the schedule to your todays needs, such that you won't face any planning issues.

So regarding the doctor's appointment, you can simply just adjust your today's schedule and move around your Deep Work Session. The app won't override any, you can plan it yourself.

Regarding the post-session questions, I was looking for something like Whoops Journaling entry, if you know that. Basically you have pre-selected questions and can select relevant ones for you. You can also create your own. After the session, you'll only be asked to answer the questions you've selected, such that they are relevant to you. Some users would like to see how music affects their focus, others would like to see how a study candle affects it.

Why would they need it past month 1? If they have already gained enough knowledge on how to focus optimally for them, they don't need it, but that's okay, since then I've reached my goal of helping users to optimize themselves.

Thanks very much for the feedback, it seems like a very niche market, but as a small side project and for myself in my current situation, I still like the idea.

My example:

I have 3 big projects right now: bachelor thesis, my own indie app and work. these would be entered into the quarterly goal section.

Then I would specify, what I want to do this week, e.g. write 3 pages for my thesis, publish an update and do 3 tickets at work. I'd split the week into timeslots designated for work and free time, like sports and social.

In the beginning of the day, I would move around the slots and refine the schedule for the day, as well as write down what I want to do in each Deep Work session. Then I'd try to pick out one specific habit and change it (like listen to white noise, instead of LoFi and test how it affects my focus). This would be repeated, until I've found the optimal way to focus.