All Tools

appwrite

Unlimited projects with no project pausing (supports websockets) and authentication service. 1 Database, 3 Buckets, 5 Functions per project in free tier.

Aserto

Fine-grained authorization as a service for applications and APIs. Free up to 1000 MAUs and 100 authorizer instances.

asgardeo.io

Seamless Integration of SSO, MFA, passwordless auth and more. Includes SDKs for frontend and backend apps. Free up to 1000 MAUs and five identity providers.

auth0.com

Hosted free for development SSO

Authgear

Bring Passwordless, OTPs, 2FA, SSO to your apps in minutes. All Front-end included. Free up to 5000 MAUs.

Authress

Authentication login and access control, unlimited identity providers for any project. Facebook, Google, Twitter and more. The first 1000 API calls are free.

Authy

Two-factor authentication (2FA) on multiple devices, with backups. Drop-in replacement for Google Authenticator. Free for up to 100 successful authentications.

btunnel

Expose localhost and local tcp server to the internet. Free plan includes file server, custom http request and response headers, basic auth protection and 1 hour tunnel timeout.

Cerbos Hub

A complete authorization management system for authoring, testing, and deploying access policies. Fine-grained authorization and access control, free up to 100 monthly active principals.

Clerk

User management, authentication, 2FA/MFA, prebuilt UI components for sign-in, sign-up, user profiles, and more. Free up to 10,000 monthly active users.

Corbado

Add passkey-first authentication to new or existing apps. Free for unlimited MAUs.

dafont

The fonts presented on this website are their authors' property and are either freeware, shareware, demo versions, or public domain.

DAS

Styra DAS Free, Full lifecycle policy management to create, deploy and manage Open Policy Agent(OPA) authorization

Descope

Highly customizable AuthN flows, has both a no-code and API/SDK approach, Free 7,500 active users/month, 50 tenants (up to 5 SAML/SSO tenants).

duo.com

Two-factor authentication (2FA) for website or app. Free 10 users, all authentication methods, unlimited, integrations, hardware tokens

getclef.com

New take on auth unlimited free tier for anyone not using premium features

isitdownstatus.com

Free public JSON API returning real-time status for 500+ popular services (GitHub, Stripe, AWS, etc.). No auth required, CORS enabled.

Kinde

Simple, robust authentication you can integrate with your product in minutes. Everything you need to get started with 7,500 free MAU.

letsencrypt.org

Free SSL Certificate Authority with certs trusted by all major browsers

logintc.com

Two-factor authentication (2FA) by push notifications, free for 10 users, VPN, Websites and SSH

Logto

Develop, secure, and manage user identities of your product - for both authentication and authorization. Free for up to 5,000 MAUs with open-source self-hosted option available.

MojoAuth

MojoAuth makes it easy to implement Passwordless authentication on your web, mobile, or any application in minutes.

nhost.io

Serverless backend for web and mobile apps. The free plan includes PostgreSQL, GraphQL (Hasura), Authentication, Storage, and Serverless Functions.

Okta

User management, authentication and authorization. Free for up to 100 monthly active users.

Ory

AuthN/AuthZ/OAuth2.0/Zero Trust managed security platform. Forever free developer accounts with all security features, unlimited team members, 200 daily active users, and 25k/mo permission checks.

paraio.com

Backend service API with flexible authentication, full-text search and caching. Free for one app, 1GB of app data.

Prismix

Free REST API (GET /api/v1/statuses) returning real-time operational status for 75+ AI services including OpenAI, Anthropic, Gemini, Mistral, and more. No authentication required. [Free tier available with Pro at $10/month]

PropelAuth

A Sell to companies of any size immediately with a few lines of code, free up to 200 users and 10k Transactional Emails (with a watermark branding: "Powered by PropelAuth").

Proton Pass

Password manager with built-in email aliases, 2FA authenticator, sharing and passkeys. Available on web, browser extension, and mobile app and desktop.

ReqBin

Post HTTP Requests Online. Popular Request Methods include GET, POST, PUT, DELETE, and HEAD. Supports Headers and Token Authentication. Includes a basic login system for saving your requests.

restspace.io

Configure a server with services for auth, data, files, email API, templates, and more, then compose into pipelines and transform data.

SikkerKey

Machine authenticated secrets manager, includes 2 projects, 2 bootstrapped machines, 20 secrets and 7 days audit log retention for free.

SSOJet

Add Enterprise SSO Without Rebuilding Your Auth. The free plan includes unlimited monthly active users, unlimited organizations, 2 SSO & 2 SCIM connections.

Stack Auth

Open-source authentication that doesn't suck. The most developer-friendly solution, getting you started in just five minutes. Self-hostable for free, or offers a managed SaaS version with 10k free Monthly Active Users.

Static Web Apps

Build, deploy, and host static apps and serverless functions with free SSL, Authentication/Authorization, and custom domains

stormpath.com

Free user management, authentication, social login and SSO

Stytch

An all-in-one platform that provides APIs and SDKs for authentication and fraud prevention. The free plan includes 10,000 monthly active users, unlimited organizations, 5 SSO or SCIM connections, and 1,000 M2M tokens.

Supabase

The Open Source Firebase Alternative to build backends. Free Plan offers Authentication, Realtime Database & Object Storage.

Superblocks

Open enterprise application platform designed for developers and semi-technical teams. Use AI to generate, edit visually and extend with code. Govern centrally with integrations, authentication, permissions & audit logs.

SuperTokens

Open source user authentication that natively integrates into your app - enabling you to get started quickly while controlling the user and developer experience. Free for up to 5000 MAUs.

tyk.io

API management with authentication, quotas, monitoring and analytics. Free cloud offering

Warrant

Hosted enterprise-grade authorization and access control service for your apps. The free tier includes 1 million monthly API requests and 1,000 authz rules.

WorkOS

Free user management and authentication for up to 1 Million MAUs. Support email + password, social auth, Magic Auth, MFA, and more.

ZITADEL Cloud

A turnkey user and access management that works for you and supports multi-tenant (B2B) use cases. Free for up to 25,000 authenticated requests, with all security features (no paywall for OTP, Passwordless, Policies, and so on).

Zuplo

Free API Management platform to design, build, and deploy APIs to the Edge. Add API Key authentication, rate limiting, developer documentation and Monetization to any API in minutes. OpenAPI-native and fully-programmable with web standard apis & Typescript. The free plan offers up to 10 projects, unlimited production edge environments, 1M monthly requests, and 10GB egress.