FusionAuth is being used by ClearSpend, a free spend-control and expense-management solution for small businesses, as their identity provider. Stephen Saucier, Head of UX Development at ClearSpend, has found FusionAuth to be easy to use, well-documented, cost-effective, and scalable. He praises its APIs, ease of self-hosting instances, and portability. FusionAuth has saved ClearSpend thousands of dollars per year in costs. The company uses FusionAuth's user management features, OAuth, MFA via Twilio SMS, and custom-built UI on top of the APIs. They run FusionAuth in a Kubernetes cluster with their main applications. Stephen notes that while FusionAuth is well-suited for their needs, there are areas for improvement, including outdated documentation and limited customization options for user interfaces.