To be honest I rarely used notion but in the last time there was the requirement to work with another person in a good wiki with some project management functionality. So I just checked and bought Buildin.

To be honest: For an AppSumo Deal is really impressive and with mature functionality. The iOS App, the Mac App and also the Webinterface is quite good. I have some minor issues while copy in the iPhone things to Buildin but thats not worth to mentioned. I really like the "offical" part and the "private" one, for copying things together. It's a very nice UI and everthing goes quite smooth.

Keep up the good work! Really corious of what comes next!

Sebastian