SuperTokens is used by 10,000s of developers worldwide. It eliminates vendor lock in and other tradeoffs associated with traditional SaaS providers. With launch of passwordless, apps can authenticate their users through email IDs or phone numbers!
Easy set-up and configuration, but the best thing is not those...
It's the confidence in what I deploy and what my users interact with since I control all the code/servers and don't have to redirect them off-site for authentication.