--- title: "Best open source identity tools in 2026 — IDSync" description: "Compare the best open source identity tools across CIAM, workforce IAM, and authorization. Compare features, pricing, fit, and alternatives — curated by the…" lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "Article", "headline": "Best open source identity tools in 2026", "description": "Compare the best open source identity tools across CIAM, workforce IAM, and authorization. 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[Home](/) 2. [Directory](/directory) 3. Compare 4. Best open source identity tools # Best open source identity tools in 2026 Last updated 2 weeks ago Quick answer ## Best open source identity tools in 2026 Short answer The leading open source identity tools are Keycloak for full-featured IAM, FusionAuth (Community) for CIAM, Cerbos for authorization, and Permit.io for policy as code on top of OPA. Related tools & categories [Customer Identity / CIAM](/directory/category/ciam)[Developer Authentication](/directory/category/developer-auth)[Workforce IAM](/directory/category/workforce-iam) ## Best options at a glance Category Tool Best for Best overall [Keycloak](/directory/keycloak) Organizations that require a fully open source, self-hosted IAM platform with enterprise-grade features and no licensing cost. Strong fit for large enterprises with technical resources to operate it, government agencies with data sovereignty requirements, and universities or research institutions managing complex identity federation. Best for enterprise [Keycloak](/directory/keycloak) Organizations that require a fully open source, self-hosted IAM platform with enterprise-grade features and no licensing cost. Strong fit for large enterprises with technical resources to operate it, government agencies with data sovereignty requirements, and universities or research institutions managing complex identity federation. Best for startups [FusionAuth](/directory/fusionauth) Organizations that want deployment flexibility (self-hosted option), comprehensive authentication features without MAU-based pricing at scale, and a developer-friendly API. Particularly relevant for companies in regulated industries with data residency requirements, gaming companies with large user bases, or teams that prefer open source-adjacent infrastructure. Best developer-first [Cerbos](/directory/cerbos) Engineering teams that need fine-grained authorization (RBAC, ABAC, PBAC, or ReBAC) in their applications and want to manage access-control policy separately from application code — particularly in microservices architectures, or where the same policies must consistently govern applications, API gateways, data platforms, and AI agents. Best open source [Keycloak](/directory/keycloak) Organizations that require a fully open source, self-hosted IAM platform with enterprise-grade features and no licensing cost. Strong fit for large enterprises with technical resources to operate it, government agencies with data sovereignty requirements, and universities or research institutions managing complex identity federation. Buyer help ### Request a vendor shortlist Tell us what you're evaluating and IDSync will identify the identity, access, and security tools that fit your use case. [Request shortlist →](/request-shortlist) ## Vendor comparison Vendor Best for Deployment Open source Pricing ![Keycloak company logo](https://www.google.com/s2/favicons?sz=128&domain=keycloak.org) [Keycloak](/directory/keycloak) Best overall Organizations that require a fully open source, self-hosted IAM platform with enterprise-grade features and no licensing cost. Strong fit for large enterprises with technical resources to operate it, government agencies with data sovereignty requirements, and universities or research institutions managing complex identity federation. Self-hosted Free (open source); Red Hat SSO commercial support available separately ![FusionAuth company logo](https://www.google.com/s2/favicons?sz=128&domain=fusionauth.io) [FusionAuth](/directory/fusionauth) Best for startups Organizations that want deployment flexibility (self-hosted option), comprehensive authentication features without MAU-based pricing at scale, and a developer-friendly API. Particularly relevant for companies in regulated industries with data residency requirements, gaming companies with large user bases, or teams that prefer open source-adjacent infrastructure. Self-hosted, Private Cloud, SaaS / Cloud-hosted (FusionAuth Cloud) [Free for self-hosted Community Edition; cloud and enterprise tiers by deployment/support](https://fusionauth.io/pricing) ![Cerbos company logo](https://www.google.com/s2/favicons?sz=128&domain=cerbos.dev) [Cerbos](/directory/cerbos) Best for authorization Engineering teams that need fine-grained authorization (RBAC, ABAC, PBAC, or ReBAC) in their applications and want to manage access-control policy separately from application code — particularly in microservices architectures, or where the same policies must consistently govern applications, API gateways, data platforms, and AI agents. Self-hosted, SaaS / Cloud-hosted (Cerbos Hub) [Free (open source PDP, self-hosted); Cerbos Hub (control plane) commercial pricing available](https://cerbos.dev/pricing) Buyer help ### Request a vendor shortlist Tell us what you're evaluating and IDSync will identify the identity, access, and security tools that fit your use case. [Request shortlist →](/request-shortlist) ## When to choose each tool ### [Keycloak](/directory/keycloak) Keycloak is the most widely deployed open source IAM platform, providing enterprise-grade SSO, MFA, SAML, OIDC, LDAP, and Kerberos support in a self-hosted, Apache 2.0 licensed package maintained by Red Hat. Choose when You need organizations that require a fully open source, self-hosted iam platform with enterprise-grade features and no licensing cost. strong fit for large enterprises with technical resources to operate it, government agencies with data sovereignty requirements, and universities or research institutions managing complex identity federation.. Skip when Your priorities sit outside Keycloak's core focus areas. ### [FusionAuth](/directory/fusionauth) FusionAuth is a comprehensive authentication and user management platform offering flexible deployment (self-hosted, private cloud, or FusionAuth Cloud), developer-friendly APIs, and broad feature coverage including SSO, MFA, SAML, OIDC, and multi-tenancy. Choose when You need organizations that want deployment flexibility (self-hosted option), comprehensive authentication features without mau-based pricing at scale, and a developer-friendly api. particularly relevant for companies in regulated industries with data residency requirements, gaming companies with large user bases, or teams that prefer open source-adjacent infrastructure.. Skip when Your priorities sit outside FusionAuth's core focus areas. ### [Cerbos](/directory/cerbos) Cerbos is an authorization management platform built around an open source policy decision point (PDP). It enforces fine-grained RBAC, ABAC, PBAC, and ReBAC policies for applications, APIs, workloads, and AI agents. Choose when Fine-grained, policy-as-code authorization (RBAC, ABAC, PBAC, ReBAC) decoupled from application code. Skip when You need authentication or user management — Cerbos is authorization only. ## Implementation considerations - Confirm SSO, SCIM, and MFA requirements with your security and IT teams before shortlisting. - Map directory sources (HRIS, AD, Google Workspace) and provisioning targets to validate coverage. - Review audit logging, session controls, and admin RBAC against your compliance scope (SOC 2, ISO 27001, HIPAA, FedRAMP). - For developer-first stacks, evaluate SDK quality, framework support, and webhook reliability. - For enterprise stacks, plan a 60–90 day pilot covering federation, lifecycle, and governance flows. ## Pricing considerations Most identity vendors price on monthly active users, employees, or features (SSO, MFA, lifecycle, governance). Always request a multi-year quote, validate add-on fees (SCIM, advanced MFA, audit logs), and account for implementation services. ## Overview > **Editorial note:** This article is maintained by the IDSync editorial team. Open source projects evolve rapidly — check each project's repository and documentation for current status. Licensing has also changed for some projects (notably HashiCorp). Always verify license terms before deploying in production. Last updated: August 2026. * * * ## Quick answer The best open source identity tools in 2026 are **Keycloak** (best overall open source IAM platform for enterprise use), **Zitadel** (best modern cloud-native open source CIAM), **SPIFFE/SPIRE** (best for workload identity in cloud-native environments), **HashiCorp Vault / OpenBao** (best for secrets management), **Authentik** (best self-hosted for smaller teams wanting a modern UI), and **Cerbos** (best for application authorization — deciding what authenticated identities are allowed to do). Open source identity tools range from full-featured IAM platforms that rival commercial vendors to focused engines for specific layers of the stack. The right choice depends on your use case, technical capacity, compliance requirements, and appetite for self-hosting operational overhead. * * * ## Best open source identity tools at a glance Tool Best for Key strength License Self-hostable? Keycloak Enterprise IAM, full-featured IdP SAML, OIDC, LDAP, Kerberos, mature Apache 2.0 Yes Zitadel Cloud-native CIAM, B2B SaaS Modern, multi-tenant, OIDC Apache 2.0 Yes + Cloud Authentik SMB/team self-hosted SSO Modern UI, easy setup MIT Yes SPIFFE/SPIRE Workload identity, K8s Standard-based, cryptographic Apache 2.0 Yes OpenBao Secrets management (Vault fork) Dynamic secrets, PKI, open source MPL 2.0 Yes Teleport Community Infrastructure access SSH/K8s/DB access, audit logs Apache 2.0 Yes Ory (Hydra + Kratos + Keto) Developer-first OIDC + identity Composable microservices Apache 2.0 Yes + Cloud Logto Developer CIAM, multi-tenant TypeScript-native, OIDC, modern Apache 2.0 Yes + Cloud OpenIAM Open source IGA Provisioning, RBAC, certifications Open core Yes BoxyHQ (SAML Jackson) B2B enterprise SSO for SaaS SAML/SCIM proxy, SaaS-focused Apache 2.0 Yes + Cloud Cerbos Application authorization (RBAC/ABAC/PBAC/ReBAC) Policy-as-code PDP, YAML + CEL Apache 2.0 Yes + Cloud * * * ## Who this page is for This guide is for engineers, platform teams, and IT leaders who are evaluating open source identity tools — either because open source principles, data ownership, or cost are driving requirements, or because they have specific technical needs that commercial vendors do not address. Open source identity tools are used across a wide spectrum: a startup self-hosting Keycloak to avoid MAU-based pricing at scale; a government agency deploying SPIFFE/SPIRE for workload identity in a classified environment; a fintech startup running Zitadel to maintain control over user data; a DevOps team deploying OpenBao for secrets management in their CI/CD pipeline. This guide is also useful for architects evaluating commercial vs. open source trade-offs, and for teams that want to understand what is available before they commit to a commercial platform. A note: "open source" exists on a spectrum. Some tools on this list have fully open licenses (Apache 2.0, MIT, MPL 2.0). Others are "open core" with proprietary enterprise features. Some have recently changed licenses (notably HashiCorp Vault in 2023). We note license status throughout; verify current terms before deploying. * * * ## How to choose ### Be honest about your operational capacity The primary cost of open source identity tools is not licensing — it is engineering time to deploy, configure, maintain, upgrade, and operate them. A poorly operated identity platform is a security liability. Be realistic: do you have the engineering resources to run this in production, handle security patches promptly, and troubleshoot incidents? If not, a vendor-hosted open source tier (Zitadel Cloud, Logto Cloud) or a commercial SaaS alternative may be more appropriate. ### Match the tool to the use case layer Different identity layers need different tools: - **Authentication / IdP / SSO:** Keycloak, Zitadel, Authentik, Ory - **CIAM / Customer identity:** Zitadel, Logto, Ory Kratos - **Workload / Machine identity:** SPIFFE/SPIRE, Vault/OpenBao - **Secrets management:** Vault/OpenBao, Teleport - **Infrastructure access:** Teleport, SPIFFE/SPIRE - **B2B SaaS enterprise SSO:** BoxyHQ SAML Jackson, Logto - **Identity governance:** OpenIAM Do not select a single tool expecting it to cover all layers. ### Evaluate community health, not just features Open source tools are only as good as their communities and maintainers. For each tool you are evaluating, look at: GitHub commit frequency, issue response time, release cadence, size of the Discord/Slack community, and whether the tool has a commercial backer (Red Hat for Keycloak, Teleport Inc for Teleport, etc.). A well-maintained project with active issues being resolved is a better bet than a feature-rich but stagnant codebase. ### Understand the license carefully The open source licensing landscape in identity has gotten complex. HashiCorp changed Vault's license to Business Source License (BSL) in 2023 — it is no longer OSI-approved open source. OpenBao forked Vault under MPL 2.0. Keycloak is Apache 2.0. Zitadel is Apache 2.0 for the core. Ory is Apache 2.0. Always check the current license of any project before committing, particularly if your legal or compliance team has opinions about acceptable licenses. ### Plan for upgrades from the start Open source identity platforms release updates regularly, and identity software has security patches that must be applied promptly. Design your deployment for easy upgrades: containerize, use infrastructure-as-code, automate testing. Projects like Keycloak have historically had complex upgrade paths between major versions — factor this into your operational planning. ### Consider hosted open source tiers as a middle path Several open source projects offer hosted cloud tiers (Zitadel Cloud, Logto Cloud, Teleport Cloud) that provide the open source software benefits (licensing, community, no vendor lock-in) with managed infrastructure (no self-hosting burden). For teams that want open source principles without full operational responsibility, these are worth evaluating. * * * ## Best for enterprise ### Keycloak Keycloak is the most mature, feature-complete open source IAM platform available and is the reference implementation for enterprise open source identity. Originally developed by Red Hat (and supported commercially as Red Hat SSO), it is deployed in some of the world's largest enterprises and government agencies. **Protocol support:** SAML 2.0, OpenID Connect/OAuth 2.0, LDAP, Kerberos, WS-Federation (via extensions), social login. **Features:** SSO, MFA (TOTP, WebAuthn/FIDO2, SMS via SPI), fine-grained authorization (ABAC/RBAC), user federation, identity brokering, extensible via Service Provider Interfaces (SPIs). **Community:** One of the largest open source IAM communities; extensive documentation; large ecosystem of third-party SPIs and extensions. **Trade-off:** Operational complexity. Keycloak requires meaningful infrastructure expertise, tuning, and upgrade management. Upgrades between major versions (particularly pre-21 to 21+) have historically required significant effort. **License:** Apache 2.0. ### SPIFFE/SPIRE For enterprise organizations building cloud-native infrastructure and needing workload identity, SPIFFE (Secure Production Identity Framework for Everyone) and SPIRE (its reference implementation) are the CNCF-backed open source standard. SPIFFE defines a standard for workload identity (SVIDs — SPIFFE Verifiable Identity Documents); SPIRE implements attestation, issuance, and rotation of SVIDs. Deployed by major technology companies for service mesh security, mTLS between microservices, and machine-to-machine authentication. Integrates with Istio, Envoy, Kubernetes, and all major cloud providers. **License:** Apache 2.0. * * * ## Best for startups and smaller teams ### Zitadel Zitadel is the strongest modern open source CIAM platform for teams that want an alternative to commercial SaaS CIAM (Auth0, Clerk) with full data ownership. Written in Go, designed for cloud-native deployment (Docker, Kubernetes), with a clean admin UI and modern OIDC implementation. **Standout features:** First-class multi-tenancy (strong B2B SaaS fit), OIDC/SAML/OAuth 2.0, passkeys/WebAuthn, comprehensive RBAC, audit logs, and machine-to-machine auth. **Cloud tier:** Zitadel Cloud provides a hosted option with a free tier (verify current limits). **License:** Apache 2.0 for the core. ### Authentik Authentik is a self-hosted SSO platform with a modern, polished UI that is particularly popular among homelab users, small IT teams, and organizations wanting a simpler self-hosted alternative to Keycloak. It supports SAML, OIDC, LDAP, RADIUS, and SCIM, and has a well-designed policy/flow engine for customizing authentication journeys. **Best for:** Teams in the 10–500 user range that want a self-hosted SSO solution with a low setup burden and good UX. Not as mature for large enterprise deployments as Keycloak. **License:** MIT for the community version; verify enterprise tier terms. * * * ## Best developer-first option ### Ory (Hydra + Kratos + Keto) Ory provides a suite of composable, microservice-based open source identity primitives: - **Ory Hydra:** OAuth 2.0 / OIDC provider - **Ory Kratos:** Identity and user management (registration, login, account recovery, settings) - **Ory Keto:** Permissions and access control (Zanzibar-inspired) Ory's philosophy is microservices and headless APIs rather than a monolithic platform. It is the most developer-centric open source identity option — you get full control over every aspect of the identity stack via APIs, and you build your own UI. The trade-off is significantly more implementation work than Keycloak or Zitadel. **License:** Apache 2.0. Ory Network provides a hosted tier. ### Logto Logto is a TypeScript-native open source CIAM platform designed for developers building modern web and mobile applications. Its API is clean, its admin console is well-designed, and it supports OIDC, social login, MFA, multi-tenancy, and enterprise SSO. Particularly well-suited for B2B SaaS products. Logto Cloud provides a hosted tier. **License:** Apache 2.0 for the core. * * * ## Best for secrets management ### OpenBao OpenBao is the community fork of HashiCorp Vault, created after Vault's license change to BSL in 2023. It maintains API and feature parity with Vault under an MPL 2.0 license, is Linux Foundation-hosted, and is actively maintained. For organizations that need Vault's capabilities (dynamic secrets, PKI, transit encryption, KV secrets) under a true open source license, OpenBao is the right choice. For organizations that are comfortable with the BSL license, **HashiCorp Vault Community Edition** remains widely deployed and has a larger ecosystem of tooling and documentation. Verify current license terms at hashicorp.com. * * * ## Best for infrastructure access ### Teleport Community Edition Teleport provides certificate-based, short-lived access to SSH, Kubernetes, databases, and internal web applications — with full session recording and audit logging. The community edition is Apache 2.0 licensed and is production-ready for smaller deployments. The enterprise edition adds HA, FedRAMP support, and advanced access request workflows. Teleport's architecture eliminates long-lived credentials entirely — all access uses short-lived certificates with automatic renewal. This makes it well-suited for both human infrastructure access and AI agent infrastructure access. * * * ## Best for B2B SaaS enterprise SSO ### BoxyHQ SAML Jackson BoxyHQ's SAML Jackson is purpose-built for SaaS vendors adding enterprise SSO (SAML) and directory sync (SCIM) to their products. It functions as a proxy between your application and your customers' identity providers, normalizing the SAML and SCIM implementations of Okta, Azure AD, OneLogin, and others into a consistent API. Apache 2.0 licensed, self-hostable, and available as a managed cloud service. * * * ## Best for application authorization ### Cerbos Cerbos covers a layer the rest of this list does not: authorization — deciding what an already-authenticated identity is allowed to do. The open source Cerbos PDP (Apache 2.0) evaluates policies written in YAML with CEL conditions, supporting RBAC, ABAC, PBAC, and ReBAC, so access rules live outside application code where they can be tested, versioned, and audited. PEP SDKs cover JavaScript, Go, Python, Java, .NET, Rust, PHP, and Ruby, with gRPC and REST for everything else. The commercial Cerbos Hub adds a managed control plane (policy authoring, testing, versioning, distribution, audit logs) and Synapse, which enriches decisions with identity and resource data from IdPs, databases, and APIs, and natively authorizes infrastructure like Envoy, Kafka, Trino, and Kubernetes. **Also in this space:** OpenFGA (CNCF, Zanzibar-style ReBAC), Ory Keto (covered above as part of the Ory suite), Casbin, and OPA (general-purpose policy engine using Rego). _License: Apache 2.0 (PDP). Self-hostable: yes, with an optional cloud control plane._ ## Implementation considerations - **High availability:** Identity infrastructure must be highly available. Plan your deployment for redundancy from the start — single-node Keycloak or Zitadel deployments are not production-appropriate. - **Security patching:** Subscribe to security mailing lists for every open source identity tool you deploy. Identity software is a high-value target and must be patched promptly. - **Data backup and recovery:** User data, configuration, and secrets stores must have tested backup and recovery procedures. Loss of identity data is catastrophic. - **Upgrade testing:** Test every upgrade in a staging environment before applying to production. Have a rollback plan. - **Secrets rotation:** Plan for regular rotation of signing keys, TLS certificates, and client secrets used by your identity platform. - **Monitoring and alerting:** Instrument your identity platform with monitoring for availability, latency, error rates, and security events. Failed login rate spikes and unexpected token issuance patterns are early indicators of security issues. - **Legal review of licenses:** Have your legal team review the licenses of any open source tool you deploy commercially, particularly if you are in a regulated industry or plan to redistribute. * * * ## Pricing considerations Open source identity tools eliminate licensing fees but introduce costs that are real and should be modeled: - **Infrastructure costs:** Hosting, load balancers, storage, database (most platforms need a relational database backend). Estimate based on your user scale. - **Engineering time:** Initial deployment, configuration, and ongoing operations. For a mature production deployment of Keycloak or Zitadel, expect 2–4 weeks of engineering time for initial setup, plus ongoing maintenance. - **Commercial support:** Red Hat offers commercial support for Keycloak (RHSSO). Zitadel, Logto, Teleport, and others offer enterprise support contracts. Factor support costs into your TCO if community support is insufficient. - **Hosted tiers:** Zitadel Cloud, Logto Cloud, Teleport Cloud, and Ory Network offer managed hosting for their respective open source projects. These are often cost-competitive with commercial SaaS alternatives at small-to-medium scale. For many organizations, the total cost of self-hosting an open source identity platform (infrastructure + engineering) exceeds the cost of a commercial SaaS alternative up to a certain scale. Model your specific costs before assuming open source is cheaper. * * * ## Related categories - [Best IAM tools for startups](/compare/best-iam-tools-for-startups) — when to use open source vs. commercial SaaS - [Best IAM tools for enterprises](/compare/best-iam-tools-for-enterprises) — enterprise IAM including open source options - [Okta alternatives](/alternatives/okta) — open source alternatives in context - [Auth0 alternatives](/alternatives/auth0) — open source CIAM alternatives - [Best SCIM provisioning tools](/compare/best-scim-provisioning-tools) — open source provisioning tools - [Best AI agent identity tools](/compare/best-ai-agent-identity-tools) — open source workload and agent identity * * * ## Related resources - **Open source identity platform comparison** — detailed Keycloak vs. Zitadel vs. Authentik vs. Ory comparison - **Keycloak production deployment guide** — HA architecture, performance tuning, and upgrade strategy - **Open source license guide for identity tools** — Apache 2.0 vs. MIT vs. BSL vs. AGPL explained - **Self-hosted vs. SaaS identity cost model** — when open source self-hosting is cheaper than SaaS - **SPIFFE/SPIRE deployment guide** — workload identity for Kubernetes and cloud-native environments * * * ## Ready to evaluate open source identity tools? IDSync provides independent guidance on open source and commercial identity platforms. Explore our comparison library, download our self-hosted identity evaluation templates, or subscribe to our newsletter for updates on open source identity developments. [Explore all open source identity resources →](/open-source) ## Related categories [Customer Identity / CIAM](/directory/category/ciam)[Developer Authentication](/directory/category/developer-auth)[Workforce IAM](/directory/category/workforce-iam) ### Further reading [ The State of AI Agent Identity 2026 Our flagship research report — market map, 28 vendor profiles, the M&A consolidation ledger, and 12-month predictions. ](/reports/state-of-ai-agent-identity-2026) ## Related vendors [ Keycloak Keycloak is the most widely deployed open source IAM platform, providing enterprise-grade SSO, MFA, SAML, OIDC, LDAP, and Kerberos support in a self-hosted, Apache 2.0 licensed package maintained by Red Hat. ](/directory/keycloak)[ FusionAuth FusionAuth is a comprehensive authentication and user management platform offering flexible deployment (self-hosted, private cloud, or FusionAuth Cloud), developer-friendly APIs, and broad feature coverage including SSO, MFA, SAML, OIDC, and multi-tenancy. ](/directory/fusionauth)[ Cerbos Cerbos is an authorization management platform built around an open source policy decision point (PDP). It enforces fine-grained RBAC, ABAC, PBAC, and ReBAC policies for applications, APIs, workloads, and AI agents. ](/directory/cerbos) IDSync provides educational buyer guidance based on publicly available information, editorial review, and user-submitted data. Vendor information should be verified before purchase. [Who we are, our methodology & disclosure policy](/about). Rankings are based on category fit, use case, publicly available information, and editorial review. Sponsored placements are clearly labeled. Buyer help ### Request a vendor shortlist Tell us what you're evaluating and IDSync will identify the identity, access, and security tools that fit your use case. [Request shortlist →](/request-shortlist) Sponsored slot available Reach buyers researching this comparison. [Sponsor this page →](/sponsor) ### Run the IAM Stack Finder Answer a few questions and get a tailored shortlist. [Start now →](/stack-finder) ### Need implementation help? 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