Developer's Guide to Cognito with Stackery
Cognito is AWS’s cloud solution for authentication – if you’re building an app that handles users with passwords, you can use AWS to handle the tricky high-risk security issues related to storing login credentials. No need to go it alone! Pricing is based on your number of monthly active users, and the first 50k users are free. For apps I’ve worked on, we would have been very pleased to grow out of that free tier.