Rownd

Wiring up sign-in, billing and user records as three separate systems eats time you would rather spend on your product.

Rownd is an authentication and user management platform that puts auth, payments and user management behind one SDK, and it is built with AI app builders in mind.

The selling point is speed: the site talks about spinning up in minutes and integrating in 10 seconds, and it ships pre-built, customizable UI components so you are not designing login screens from scratch.

Sign-in methods are meant to be low friction, secure and adaptive, and Rownd also includes smart links and AI-ready features.

On security, it is SOC-2 certified and describes itself as enterprise-grade.

It also provides user insights and analytics, and it is backed by YCombinator.

The free tier is generous, covering up to 1 million monthly active users.

The catch is add-ons.

Things like advanced customizations and custom domains cost extra, particularly on the Builder plan, and international SMS rates apply if you use SMS sign-in.