FusionAuth is the customer authentication and authorization platform that make developers' lives awesome. You'll get all the features your app needs like user registration, SSO, MFA, and more, plus a customizable, scalable solution you can run on any computer, anywhere in the world.

A customer data platform that helps companies harness first-party customer data and democratizes access to reliable data for all teams. Standardize data collection, unify user records, and route customer data into any system where it’s needed.

Newsletter Spy is a database of 20,000+ Substack newsletters and includes information like the number of subscribers, the launch date, and engagement metrics.