Tesseral

Complete B2B authentication solution that handles everything from basic login to enterprise-grade security features. Build secure applications faster with pre-built login UI that matches your brand, enterprise connections supporting SAML SSO and SCIM provisioning, and fine-grained authorization with custom roles.

Key features include:

• Pre-built login components - Ship login pages in minutes with customizable styling
• Enterprise integrations - Connect with any identity provider including Microsoft Entra and Okta
• Role-based access control - Design granular permission policies with one-line code checks
• Managed API keys - Issue revocable, scoped keys for customer and partner integrations
• Advanced security - Support for passkeys, TOTP authenticator apps, and phishing-resistant MFA
• Developer-friendly SDKs - Works with Next.js, React, Flask, Express.js, Go and other major frameworks

Perfect for B2B SaaS applications requiring user impersonation for customer support, real-time webhooks for system synchronization, and SCIM provisioning for automated user management. Trusted by YC companies to scale from startup to enterprise.