Castle βeta Stop bad people from logging in to your website
addons Drop-in UI
Userbin widgets are a set of easy-to-use, drop-in authentication forms for any platform. Widgets and forms are easily customized to integrate with your design.
iphone Seamless Mobile Integration
Make it super-easy to connect your app to your backend. Once a user is logged in to your iOS or Android app, any requests made to your backend are automatically authenticated.
trifork One API For All Providers
Authenticate users with Email, Facebook, LinkedIn and 10+ other providers without having to worry about updating or merging user information from multiple sources.
message Automated Emails
Send pixel-perfect, mobile-friendly welcome emails to new users. Markdown lets you change the copy to your needs.
upgraph Actionable Metrics
How many signups did you get today? When was the last time a user logged in into your application? Where did a specific user originally come from?
people User Management
Be in total control of your user base and keep track of what is going on. Let your users in gradually, block misbehaving ones, etc.
Castle is currently only available in the US region.