Zero-Cost Entry21 tools audited

Free Authentication & Identity Management (IAM) & Open Source Software

Technical selection of platforms without financial barrier to entry: permanent free tiers, self-hosted projects, and open-source alternatives.

View full catalog for Authentication & Identity Management (IAM)

Free Limits & Commercial Threshold Matrix

Exact breakdown of quotas, credit card requirements, and commercial allowances before requiring an upgrade.

ToolModelConditionsFree Tier DetailsSSO TaxAction
InfisicalFreemium
No credit card requiredCommercial use allowedUnlimited usage with no expiration
Gratuito para individuos y proyectos personales con un límite de 5 identidades y proyectos ilimitados.Single Sign-On Tax (Enterprise SAML)Try
CloudflareFreemium
No credit card requiredRestricted to personal / non-commercial useUnlimited usage with no expiration
Gratis para proyectos personales o de pasatiempo que no sean críticos para el negocio, incluyendo CDN y protección DDoS.Single Sign-On Tax (Enterprise SAML)Try
TwingateFreemium
No credit card requiredCommercial use allowedUnlimited usage with no expiration
Plan gratuito permanente para pequeños equipos con acceso básico a recursos de red.Single Sign-On Tax (Enterprise SAML)Try
KeycloakFree
No credit card requiredCommercial use allowedUnlimited usage with no expiration
100% Free and open source without commercial limits.StandardTry
WorkOSFreemium
No credit card requiredCommercial use allowedMonthly recurring quota reset
AuthKit es gratuito hasta 1 millón de usuarios activos mensuales.Single Sign-On Tax (Enterprise SAML)Try
SupabaseFreemium
No credit card requiredCommercial use allowedMonthly recurring quota reset
Incluye 2 proyectos gratuitos con límites de 500MB de base de datos y 50,000 usuarios activos mensuales.StandardTry
FusionAuthFreemium
No credit card requiredCommercial use allowedMonthly recurring quota reset
Permanent free tier with monthly usage allowances.StandardTry
ClerkFreemium
No credit card requiredCommercial use allowedMonthly recurring quota reset
Incluye un límite mensual de usuarios activos (MAU) en el plan gratuito para desarrollo y producción inicial sin tarjeta de crédito.Single Sign-On Tax (Enterprise SAML)Try
ScalekitFreemium
No credit card requiredCommercial use allowedMonthly recurring quota reset
Permanent free tier with monthly usage allowances.Single Sign-On Tax (Enterprise SAML)Try
KindeFreemium
No credit card requiredCommercial use allowedMonthly recurring quota reset
Permanent free tier with monthly usage allowances.Single Sign-On Tax (Enterprise SAML)Try
DescopeFreemium
No credit card requiredCommercial use allowedMonthly recurring quota reset
Permite utilizar la plataforma de forma gratuita hasta alcanzar el límite mensual configurado de usuarios activos (MAU).StandardTry
Rocket.ChatFreemium
No credit card requiredCommercial use allowedUnlimited usage with no expiration
Edición comunitaria autohospedada disponible de forma gratuita e indefinida con funciones base de mensajería.Single Sign-On Tax (Enterprise SAML)Try
StytchFreemium
No credit card requiredCommercial use allowedMonthly recurring quota reset
Incluye un nivel gratuito permanente basado en un volumen determinado de usuarios activos mensuales (MAU).Single Sign-On Tax (Enterprise SAML)Try
ProtonFreemium
No credit card requiredCommercial use allowedUnlimited usage with no expiration
Acceso gratuito permanente a Proton Mail y Calendar con cuota de almacenamiento limitada y funciones estándar.Single Sign-On Tax (Enterprise SAML)Try
Auth0Freemium
No credit card requiredCommercial use allowedMonthly recurring quota reset
El plan gratuito incluye un límite estricto de usuarios activos mensuales (MAU) y acceso a conectores sociales estándar.Single Sign-On Tax (Enterprise SAML)Try
MemberstackFreemium
No credit card requiredCommercial use allowedUnlimited usage with no expiration
Gratuito para construir y probar el sitio web de manera ilimitada hasta el momento del lanzamiento oficial en producción.Single Sign-On Tax (Enterprise SAML)Try
Cisco DuoFreemium
No credit card requiredCommercial use allowedUnlimited usage with no expiration
Duo Free permite hasta 10 usuarios de manera gratuita con funcionalidades básicas de autenticación multifactor.Single Sign-On Tax (Enterprise SAML)Try
TutaFreemium
No credit card requiredRestricted to personal / non-commercial useUnlimited usage with no expiration
Incluye 1 GB de almacenamiento, 1 calendario y acceso a aplicaciones móviles y de escritorio.StandardTry
OutsetaFreemium
No credit card requiredCommercial use allowedMonthly recurring quota reset
Incluye hasta 1,000 contactos con una comisión del 2% por transacción en el nivel inicial.StandardTry
OryFreemium
No credit card requiredCommercial use allowedMonthly recurring quota reset
Permanent free tier with monthly usage allowances.Single Sign-On Tax (Enterprise SAML)Try
AuthyFree
No credit card requiredCommercial use allowedUnlimited usage with no expiration
Aplicación completamente gratuita sin límites en la cantidad de tokens almacenados para uso personal o comercial.StandardTry

Audited Free & Freemium Platforms (21)

Infisical

4.7/5.01 verified review
Freemium

Modern identity security platform for developers, machines, and AI agents.

  • Open-source and transparent alternative to HashiCorp Vault.
  • Full self-hosting capabilities for private infrastructure.
  • Comprehensive ecosystem including CLI, SDKs, and Kubernetes operator.

30.2kstars on GitHub

View AnalysisVisit Website (opens in a new tab)

Cloudflare

4.7/5.01 verified review
Freemium

Global cloud connectivity platform providing security, CDN, and serverless compute.

  • Massive global edge network spanning 335+ cities to reduce end-user latency.
  • Advanced built-in DDoS mitigation and WAF protection right out of the box.
  • Serverless compute via Workers distributed globally at the network edge.
View AnalysisVisit Website (opens in a new tab)

Twingate

4.6/5.01 verified review
Freemium

Identity-based Zero Trust network access platform to replace legacy VPNs.

  • Rapid deployment without requiring modifications to existing network architecture.
  • Granular identity-based access control at the individual resource level.
  • Superior performance compared to traditional VPNs by avoiding traffic backhauling.
View AnalysisVisit Website (opens in a new tab)

Keycloak

4.6/5.01 verified review
FreeOpen SourceApache-2.0

Open source identity and access management solution with single sign-on capabilities.

  • Completely open source with no commercial licensing fees.
  • Native support for OpenID Connect, OAuth 2.0, and SAML 2.0 standards.
  • Built-in identity brokering and social login integration.

37.6kstars on GitHub

View AnalysisVisit Website (opens in a new tab)

WorkOS

4.6/5.01 verified review
Freemium

Developer APIs and SDKs to make SaaS applications enterprise ready.

  • Rapid integration of SAML and OIDC protocols via modern SDKs.
  • Native support for SCIM directory synchronization.
  • Generous free tier for basic authentication.
View AnalysisVisit Website (opens in a new tab)

Supabase

4.6/5.01 verified review
FreemiumOpen SourceApache-2.0

Open source Firebase alternative providing a full Postgres database, authentication, and instant APIs.

  • Full Postgres database access with complete SQL capabilities and extensions.
  • Auto-generated instant REST and realtime APIs based directly on the schema.
  • Open source architecture allowing complete self-hosting without lock-in.

114.1kstars on GitHub

View AnalysisVisit Website (opens in a new tab)

FusionAuth

4.6/5.01 verified review
Freemium

API-driven CIAM platform with flexible deployment and total control

  • Fully API-driven architecture for custom automation and workflows
  • Self-hosted Docker container deployment for air-gapped environments
  • Native support for modern authentication standards including passkeys
View AnalysisVisit Website (opens in a new tab)

Clerk

4.5/5.01 verified review
Freemium

Comprehensive user authentication and management platform for modern web and mobile applications.

  • Prebuilt UI components that reduce weeks of front-end development time.
  • Advanced native support for multi-tenancy and enterprise organizations.
  • Optimized SDKs for modern frameworks such as Next.js, Remix, and React.
View AnalysisVisit Website (opens in a new tab)

Scalekit

4.5/5.01 verified review
Freemium

MCP gateway and delegated auth for AI agents with 600+ connectors.

  • Per-user delegated OAuth access instead of shared service accounts.
  • Unified MCP gateway providing access to over 600 pre-built connectors.
  • Granular permission controls and audit logs for every tool call.
View AnalysisVisit Website (opens in a new tab)

Kinde

4.5/5.01 verified review
FreemiumOpen SourceMIT

Integrated authentication, user management, and billing platform for SaaS.

  • Native integration between authentication and billing.
  • Extensive ecosystem of SDKs for common frameworks.
  • Built-in customer portal and user management dashboard.

19stars on GitHub

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Descope

4.5/5.01 verified review
FreemiumOpen SourceMIT

Visual CIAM platform for users, B2B business customers, and AI agents.

  • Visual workflow orchestration via drag-and-drop builders and extensible SDKs.
  • Native support for complex identities including users, B2B tenants, and AI agents.
  • Rapid implementation of passwordless authentication and SAML/OIDC connectors.

72stars on GitHub

View AnalysisVisit Website (opens in a new tab)

Rocket.Chat

4.5/5.01 verified review
Freemium

Sovereign and collaborative communication platform with flexible deployment and Matrix federation.

  • Full support for on-premises and air-gapped deployments.
  • Native federation based on open protocols like Matrix and XMPP.
  • High level of control over data sovereignty and regulatory compliance.

46.3kstars on GitHub

View AnalysisVisit Website (opens in a new tab)

Stytch

4.5/5.01 verified review
FreemiumOpen SourceMIT

API-first authentication and security platform for modern applications.

  • Comprehensive APIs and SDKs for passwordless auth and passkeys
  • Embeddable admin portal for enterprise customer self-service
  • Native support for SAML SSO and SCIM provisioning

40stars on GitHub

View AnalysisVisit Website (opens in a new tab)

Proton

4.5/5.01 verified review
Freemium

Cloud security and privacy suite with end-to-end encryption

  • End-to-end encryption and zero-knowledge architecture
  • Swiss legal jurisdiction with strict privacy laws
  • Integrated ecosystem including mail, VPN, calendar, and storage
View AnalysisVisit Website (opens in a new tab)

Auth0

4.5/5.01 verified review
FreemiumOpen SourceMIT

Adaptable authentication and authorization platform for modern applications and AI agents.

  • Wide variety of SDKs and connectors for multiple programming languages.
  • Rapid implementation of complex authentication flows like MFA and SSO.
  • Centralized administration dashboard for user management and access rules.

343stars on GitHub

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Memberstack

4.4/5.01 verified review
Freemium

Membership, user authentication, and Stripe payment platform for websites

  • Direct integration with Webflow and any framework via JavaScript SDK
  • Native management of recurring charges and webhooks through Stripe
  • Flexible client-side content and route protection
View AnalysisVisit Website (opens in a new tab)

Cisco Duo

4.4/5.01 verified review
Freemium

Cloud-delivered identity security and phishing-resistant MFA by Cisco.

  • Phishing-resistant multi-factor authentication
  • Direct integration with enterprise directories and apps
  • Strict device trust policies enforced prior to access
View AnalysisVisit Website (opens in a new tab)

Tuta

4.4/5.01 verified review
FreemiumOpen SourceGPL-3.0

End-to-end encrypted secure email, calendar, and contacts with quantum-safe protection.

  • End-to-end encryption with quantum-resistant cryptographic algorithms.
  • Zero-knowledge architecture applied to calendars and contact lists.
  • Proprietary infrastructure hosted in secure data centers in Germany.

8.1kstars on GitHub

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Outseta

4.4/5.01 verified review
Freemium

All-in-one membership platform for managing payments, CRM, and user authentication.

  • Combines billing, CRM, support, and authentication in one ecosystem.
  • Rapid implementation on static sites and website builders.
  • Native handling of global taxes and international billing.

12stars on GitHub

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Ory

4.0/5.01 verified review
Freemium

API-first, cloud-native identity and access management (IAM) platform.

  • Modular architecture allowing selective service deployment.
  • Native support for open standards like OIDC and OAuth2.
  • Versatile deployment options between managed cloud and self-hosting.
View AnalysisVisit Website (opens in a new tab)

Authy

3.8/5.01 verified review
Free

Two-factor authentication (2FA) application with cloud backup and multi-device support.

  • Multi-device synchronization via encrypted cloud backups.
  • Simple setup process for multiple online services.
  • Free mobile application for iOS and Android without hidden costs.
View AnalysisVisit Website (opens in a new tab)