Kinde

Authentication, billing, and access management platform for modern SaaS products. Combines sign-up, sign-in, MFA, multi-tenancy, feature flags, and recurring subscription billing in a single developer platform, letting teams secure and monetize their product from day one without wiring multiple vendors together.

Trusted by over 70,000 developers. Kinde differentiates by unifying auth, access control, and billing in one integration instead of piecing together Auth0, Stripe, and feature-flag services. Offers SDKs for Next.js, React, Python, PHP, and TypeScript, plus a single SDK philosophy for smaller bundle sizes and one-time integration.

Main capabilities:

• Password and passwordless auth with social logins, magic links, and enterprise SSO (SAML, Entra ID)
• Multi-tenancy with per-organization domains, auth configs, default roles, and domain-based access policies
• Feature flags and recurring subscription billing built in
• TypeScript and JavaScript workflows synced to your repo for custom auth flows and integrations
• Custom auth pages with full control over HTML, CSS, and branding while using Kinde-hosted security
• Machine-to-machine and connected-app auth for backend flows
• SOC 2 and ISO 27001 compliance

SaaS founders and product teams use Kinde to ship auth, billing, and feature flags with minimal setup. B2B apps leverage org-level configs to support customers on SAML, Google, or email-based auth. Developers benefit from one-liner integrations, Management API, webhooks, and first-party access to roles, permissions, and environment variables.