This hasn't garnered many responses, but I thought I'd share my research so far. I've narrowed it down to Stormpath and Auth0. I also considered: * AuthRocke

This hasn't garnered many responses, but I thought I'd share my research so far. I've narrowed it down to Stormpath and Auth0. I also considered: * AuthRocket - no uptime page, were still in beta as of July 2014 (two years ago) - not mature enough yet * UserApp - got their seed funding in 2014, too immature * Okta - enterprise-focused, no public pricing for their "for Developers" product * IdentityNow - enterprised-focused, no public pricing * OneLogin - IT-focused * Callsign - apparently mobile-only, trying to be passwordless, no public pricing, overall trying to solve a different problem than what I want * Dailycred - feels abandoned, launched 4 years ago but still lacks team (according to Crunchbase), concerned about longevity * Amazon Cognito - AWS-focused