OneLogin and FusionAuth offer powerful identity management solutions, but they differ significantly in their approach. OneLogin focuses on emerging technology like blockchain integration, while FusionAuth prioritizes features and functionality tailored to meet customers' specific needs without unnecessary overhead. Both platforms provide secure access, multi-factor authentication, single sign-on, customizable communication templates, and user reports. However, FusionAuth stands out for its free tier for unlimited users, true single-tenant solutions, configurable password encryption, enterprise identity unification capabilities, and ability to deliver custom feature development tailored to smaller companies' unique needs.