Don't Double Book Me isn't some crazy startup idea that needs funding, I am not shooting for the moon with this. Feature development was basically done in a few weekends and I like that it solves a single problem well. There is definitely a market for people who need a tool like this. Look at Reclaim, Calendly, Clockwise, CalendarBridge, OneCal, etc, which have successfully tapped into this market but are focused on selling to teams.

I designed it for individuals balancing personal and professional commitments. I work somewhere with a heavy meeting culture, nothing I can really do about that. I found myself double booked often with personal commitments I had. Consider a scenario where you need to attend your child’s school play, but you forgot to also block off time on your work calendar, now your colleagues think you’re free and invite you to something. You've been double booked.

Events outside your working hours aren’t synced, protecting your personal time and privacy. The default setting is to create events on a destination calendar with the summary explicitly being "Busy" without any other information, but you can change it so it mirrors the event details should you choose.

I think if you have young kids and in the 40s where the need for healthcare appointments go up there might be a demand for this product.

Not only ^ this, but also working with geo-distributed teams

They try to work with me but I cancel their meeting requests and deal with them through email. We should all be doing this

But not everyone uses their work calendar for personal reasons, some prefer to keep their personal commitments private.

I put a generic “out of office” block on my calendar if I have personal business and it’s rare enough that I don’t get why it needs a solution. Maybe other people are scheduling things during work hours a lot more often than me?

That totally works if it is rare for you! The last 2 months I've had a few things I've added to my personal calendar that synced with work calendar: lunch with a family member, dropping off or picking up car from service, haircuts, contractor stopping by, dentist, vet appointment, etc. It's nice to not worry about it since it marks me as Busy right when I create the event.

I’m sorry for being negative. I just wanted to rant about people who try to schedule friendship on a calendar.

This sounds reasonable and I wish you good luck