Also should mention that it's MIT licensed, not MIT software.
But a cool program nonetheless!
Thank you for pointing out the potential ambiguity in saying "MIT open source". I can't edit my comment at this point in time - I'll be more clear next time.
It looks like the binary is $5 but it’s an open source electron app, so pretty easy to just clone the repo and build it yourself
:) I tried to make it as easy as possible to build your own copy. At the moment it should be as simple as `npm install` and `npm run electron` (two commands with no other setup to create the installer -- all in under 5 minutes)