Work fine in Yosemite

I am on 10.10.2 and Blotter works fine.
The interaction with it is minimal on purpose, the settings can be done from the menubar icon (maybe this helps other reviewers)

It is best used with configuring the shortcuts to add Events and Reminders.
For me this is much quicker than doing so via Calendar app and even quicker than Fantastical which I also use becuase the entry window opens in the middle of the screen.

I would like to see a setting to change the level of opacity, font size adjustment of the TODO list, and to have more freeform claendar layout control. That would make it a 5-star app.

erdrd about Blotter