Scalekit IDP Simulator is a development tool designed to test Single Sign-On (SSO) implementations without requiring real Identity Provider (IdP) accounts. The simulator provides an OIDC-compliant testing environment that allows developers to validate SSO flows during development and testing phases. The tool enables testing of both Service Provider (SP) and Identity Provider (IdP) initiated authentication flows. Developers can simulate various edge cases including incorrect credentials, expired sessions, and timeout scenarios to identify potential issues before production deployment. The simulator supports configuration of custom user attributes, allowing teams to test how their applications process and map user data received through SSO flows. This includes testing unlimited custom attributes and validating attribute mapping configurations. The product is part of Scalekit's broader authentication platform and integrates with their SSO module. It provides instant flow validation capabilities without the need for setting up real IdP accounts, performing attribute mappings, or managing user assignments in production identity providers. The simulator is designed for development teams implementing enterprise SSO capabilities, offering a sandbox environment to accelerate testing cycles and catch configuration errors early in the development process.