A few weeks back, Ross Chaldecott, CEO of Kinde spoke to a product forum I'm part of. I had not previously heard of Kinde, but Ross was terrific and when I realised I needed auth for my funny little CMS I decided to give it a shot. They've got a sufficiently generous free tier and the process of getting set up could not have been more seamless. My needs are incredibly basic and I have no idea whether or if Kinde is suitable yet for big complex use-cases, but it's nicely documented and neatly designed. Ross also says many of the correct words about how to run a software product organisation.