25 tools in this category

Auth & Identity

Authentication and identity management tools for securing user access in web and mobile applications.

For developers who need reliable, scalable auth without building it from scratch.

Auth Platforms20Auth Libraries4

Our top recommendations in Auth & Identity.

Auth & IdentityAuth for React

Authentication and user management platform for sign-in, sessions, and modern app identity.

Why it stands out

Especially polished for modern web apps that want fast auth setup without building identity UI.

ClerkAuthentication

Auth & IdentityDeveloper identity

Identity platform for adding authentication, user management, SSO, and access control to apps.

Why it stands out

Free: 25k MAU; Essentials/Professional self-serve: 500 MAU on public 2026 cards—confirm before budgeting.

Auth0Okta

Auth & IdentityControl-first auth platform

Authentication and user-management platform with self-hosted roots, public tiered pricing, and a strong fit for teams that want more control than auth-as-a-service defaults.

Why it stands out

Choose FusionAuth when control, self-hosting, and customization matter more than the lightest possible auth onboarding.

FusionAuthAuthentication

Top comparison

How the leading tools compare.

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Clerk vs Auth0

B2C and B2B SaaS shipping auth in days on Next.js or React vs B2B SaaS selling into buyers expecting SAML, SCIM, and audit evidence

Compare side by side

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FusionAuth vs Logto

Customer identity vs Customer identity and access management

Compare side by side

All auth & identity tools

Browse the full list.

Auth & IdentityAuth for React

Authentication and user management platform for sign-in, sessions, and modern app identity.

Why it stands out

Especially polished for modern web apps that want fast auth setup without building identity UI.

ClerkAuthentication

Auth & IdentityDeveloper identity

Related stacks

Workflows using auth & identity tools.

Browse all stacks

StackBased Editorial

Enterprise SaaS Auth Stack

Add enterprise SSO, SCIM provisioning, and audit logs to your SaaS product without building it in-house. The identity features enterprise procurement teams require before signing a purchase order.

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Open stack

StackBased Editorial

Expo Consumer App Growth Stack

This is the mobile stack I'd use for a consumer app that needs sign-in, subscriptions, analytics, and crash reporting before a real launch push.

Fresh stack

Open stack

Identity platform for adding authentication, user management, SSO, and access control to apps.

Why it stands out

Free: 25k MAU; Essentials/Professional self-serve: 500 MAU on public 2026 cards—confirm before budgeting.

Auth0Okta

Auth & IdentityControl-first auth platform

Authentication and user-management platform with self-hosted roots, public tiered pricing, and a strong fit for teams that want more control than auth-as-a-service defaults.

Why it stands out

Choose FusionAuth when control, self-hosting, and customization matter more than the lightest possible auth onboarding.

FusionAuthAuthentication

Auth & IdentityOpen-source CIAM

Open-source identity platform for authentication, organizations, SSO, MFA, machine-to-machine auth, and developer-controlled CIAM deployments.

Why it stands out

The natural comparison set includes Auth0, Clerk, WorkOS, and other developer-facing identity platforms.

LogtoAuthentication

Auth & IdentityOpen-source auth platform

Authentication platform with open-source self-hosting, usage-based cloud pricing, and add-on economics that remain visible on the official pricing page.

Why it stands out

Choose SuperTokens when the team wants open-source flexibility with a managed cloud path still available.

SuperTokensAuthentication

Auth & IdentityAuth abuse protection

Realtime bot, fraud, and abuse protection from WorkOS for signups, auth flows, device intelligence, and identity-adjacent risk detection.

Why it stands out

A more natural fit for app-auth and account-protection use cases than for payment-fraud specialization.

WorkOS RadarFraud prevention

Auth & IdentitySaaS auth + billing

Authentication, user management, feature flags, and billing infrastructure for modern SaaS products.

Why it stands out

Clerk is especially polished for React and Next.js UI; Kinde competes harder when billing and access management belong in the same vendor decision.

AuthenticationBilling

Auth & IdentityAuthorization database

Open-source Zanzibar-inspired authorization database from AuthZed, with managed cloud and dedicated commercial options around the core engine.

Why it stands out

Choose SpiceDB when authorization complexity is big enough to justify a dedicated permissions system.

SpiceDBAuthorization

Auth & IdentityB2B CIAM

Customer identity and access platform for B2B SaaS with a free tier, enterprise connections, and productized CIAM workflows.

Why it stands out

Choose Frontegg when enterprise-ready B2B CIAM and organization workflows are central to the product.

FronteggCIAM

Auth & IdentityProduct authorization

Authorization platform for RBAC, ABAC, ReBAC, and policy workflows with a free tier and quota-based pricing for production apps.

Why it stands out

Choose Permit when the main problem is authorization complexity rather than basic sign-in flows.

Permit.ioAuthorization

Auth & IdentityIdentity infrastructure

Identity infrastructure platform with free developer usage, production SaaS plans, and self-hosted enterprise licensing.

Why it stands out

Choose Ory when deployment flexibility and identity primitives matter more than highly packaged product UX.

OryIdentity

Auth & IdentityAuthorization library

Open-source authorization library for ACL, RBAC, ABAC, ReBAC, and other access-control models across many programming languages.

Why it stands out

Choose Casbin when embedded authorization logic and policy flexibility matter more than hosted admin UX.

CasbinAuthorization

Auth & IdentityOpen-source auth

Open-source authentication platform for Next.js and React apps with hosted or self-hosted deployment paths.

Why it stands out

Compared with Clerk, Stack Auth is more compelling when self-hosting and open-source control matter.

AuthenticationOpen source

Auth & IdentityFlexible identity platform

Identity platform with free cloud usage, a $100/month pro tier, and self-hosted or enterprise deployment options.

Why it stands out

Choose ZITADEL when you want a modern identity platform with a relatively straightforward pricing ladder.

ZITADELIdentity

Auth & IdentityPolicy language

Open-source policy language for authorization decisions, maintained in the open and used by services such as Amazon Verified Permissions.

Why it stands out

Choose Cedar when authorization semantics themselves need to become a deliberate design layer.

CedarAuthorization

Auth & IdentityOpen-source auth

Open-source auth library for JavaScript apps with OAuth, email, and credentials support.

Why it stands out

Maximum flexibility at the cost of engineering and security ownership

AuthOpen source

Auth & IdentityNo-code CIAM

Authentication platform for passkeys, MFA, SSO, and user journeys with flexible developer controls.

Why it stands out

Stands out for flexible auth flows that mix passkeys, MFA, SSO, and visual journey building.

DescopeNo-code

Auth & IdentityGoogle identity

Authentication service for Firebase apps with email, phone, social login, and client SDKs.

Why it stands out

Hard to beat for fast app auth when the rest of the stack already leans on Firebase.

FirebaseAuth

Auth & IdentitySelf-hosted IdP

Open-source identity and access management platform for SSO, user federation, roles, and self-hosted auth flows.

Why it stands out

Operational load rivals a small data team—budget on-call

KeycloakOIDC

Auth & IdentitySession library

Lightweight authentication library for session-based auth in JavaScript and TypeScript apps.

Why it stands out

Auth.js ships more turnkey providers out of the box

LuciaAuth

Auth & IdentityWallet auth

Passwordless authentication platform for secure sign-in flows across web and mobile apps.

Why it stands out

Developer tier MAW ceiling is low for viral consumer apps.

MagicWeb3

Auth & IdentityIAM standard

Enterprise identity platform for SSO, MFA, lifecycle management, and secure app access.

Why it stands out

Enterprise teams choose it when security reviews, SSO sprawl, and lifecycle controls all matter.

OktaIAM

Auth & IdentityB2B auth

Authentication platform for passwordless login, OAuth, MFA, and B2B identity workflows.

Why it stands out

Especially compelling for passwordless and B2B identity flows that outgrow basic login tooling.

StytchPasswordless

Auth & IdentityPostgres auth

Authentication service for apps with sign-in, user management, and database-connected auth flows.

Why it stands out

Tighter coupling to Postgres can simplify mental models versus external user directories

SupabasePostgres

Auth & IdentityEnterprise SSO

Enterprise identity toolkit for B2B SaaS with SSO, SCIM, directory sync, and auth flows.

Why it stands out

Connection = one enterprise customer’s SSO or Directory Sync integration, not per end user.

WorkOSSSO