We use PropelAuth, which doesn't get enough mentions in these types of comparisons. I recently did a quick re-check of the landscape, and for our purposes, Pro

We use PropelAuth, which doesn't get enough mentions in these types of comparisons. I recently did a quick re-check of the landscape, and for our purposes, Propel still is the only provider that works. I was surprised to find that support for Machine-to-Machine API auth (ie., standard OAuth) isn't well supported. Likewise, OIDC support is patchy amongst the other providers. I reached out to Clerk support, and for both these use cases, they weren't supported. Propel is great.