Ivory by Tapbots 
Psst…hey you…yea the one in front of the Mac. Go here: https://tapbots.com/ivory/mac/
Sorry about the short Mac alpha window yesterday. We ran into a TestFlight issue and are trying to get it resolved. We definitely want to allow more of you access to the Ivory for Mac alpha. Will hopefully have more info in a couple days. Thanks for your patience! 🙏
Okay lets try this one more time. We are limiting the list to 2500 spots for tonight just to make sure things are working okay. If there are no major TestFlight issues, we will open up the rest of the spots tomorrow morning, Texas time.
Important: If you are already in the current Mac TestFlight, you'll have to join this one again, unfortunately. The one you already joined won't get updates and will stop working after some time. Sorry for the annoyance!
This is the last chance to get into the Mac alpha (limited to around 10k spots by TestFlight). If it's full, you'll just have to wait for the App Store release which shouldn't be too long anyways. Thanks everyone!
tonofpudding@ivory I'm never quite sure how much to report bugs you probably already know about, don't want to (ahem) bug you too much.
Anyway, first one you may or may not already be aware of:
On first run of Ivory Desktop, after going through the initial signup/login flow, the "accounts" section in settings is missing, and there's no way to add other accounts. I had to quit & relaunch for it to appear.