Free-tier auth & identity

Proton Pass

Proton Pass is a password manager that stores logins, notes, and credit cards with end-to-end encryption and syncs them across desktop, mobile, browser extensions, and a web app. It includes autofill,...

Hexclave

Hexclave is an open-source platform for user authentication, payments, and product signals. It provides hosted and self-hosted options, with documentation, SDKs, and dashboard access for integrating identity, messaging, analytics, and related product infrastructure.

Okta Integrator Free Plan

Okta Integrator Free Plan is a web-based identity and access management environment for developers to build, test, and manage integrations with Okta products. The agreement states that it is intended ...

PropelAuth

PropelAuth is an authentication platform for B2B products. It provides hosted and self-hosted options for multi-tenant authentication, organization management, role-based access control, enterprise SSO, SCIM, API key authentication, user impersonation, audit logs, and MCP server authentication.

LoginLlama

LoginLlama is an API for login fraud detection that scores authentication attempts in real time before a user is authenticated. It accepts a login request, auto-detects IP address and user agent from ...

Ory

Ory is an identity and access management platform for applications, enterprises, and AI agents. It provides customer identity, B2B identity, and agent identity capabilities through API-first components for authentication, authorization, permissions, and session management.

Tenzu

Tenzu is a web-based task and project management tool that uses Kanban boards, workspaces, and collaborative editing to organize work. It includes real-time co-authoring on task content, attachments, comments, a REST API, and support for multiple languages.

Permit.io

Permit.io is an authorization platform for apps, APIs, data, and AI agent workflows. It provides policy enforcement through a policy engine and PDPs, with support for RBAC, ABAC, ReBAC, and PBAC, plus GitOps, SDK, API, and Terraform-based policy management.

ZITADEL is an identity infrastructure platform for authentication and authorization. It provides hosted login, API-first identity management, social login templates, passwordless authentication, multifactor authentication, passkeys, role-based access control, and multi-tenant organization support.

Appwrite

Appwrite is an open-source backend development platform that combines authentication, databases, storage, serverless functions, messaging, realtime subscriptions, hosting, and network services in one ...

WorkOS

WorkOS is an enterprise identity and access platform that provides APIs for adding single sign-on, directory sync, user management, audit logs, role-based access control, bot blocking, and related authentication features to applications.

Frontegg

Frontegg is a customer identity and access management platform for SaaS applications. It provides authentication, authorization, multi-tenant user management, SSO, SCIM, MFA, admin portals, and analytics through a low-code platform and developer APIs.

SuperTokens

SuperTokens is an open source user authentication platform that provides session management, login flows, and account security features for web and mobile applications. It supports email/password auth...

Kinde

Kinde is a developer platform for authentication, billing, access management, feature flags, and user management in SaaS applications. It provides hosted auth flows, SDKs for multiple languages and fr...

Logto

Logto is an authentication and authorization platform for developers. It implements OIDC and OAuth 2.1 and adds sign-in flows, multi-tenancy, enterprise SSO, RBAC, MFA, organizations, machine-to-machine authentication, and account APIs for SaaS and AI applications.

Auth0

Auth0 is an authentication and authorization platform for web, mobile, and AI agent applications. It provides hosted login flows, social and enterprise connections, passwordless authentication, multif...

Docker Hub

Docker Hardened Images is a catalog of secure, minimal, production-ready container images published through Docker Hub. The catalog includes hardened base images and packaged components for common runtimes, infrastructure tools, and Kubernetes add-ons.

AWS Certificate Manager

AWS Certificate Manager is a managed service for provisioning, deploying, and renewing SSL/TLS certificates across AWS, hybrid, and multicloud environments. It helps organizations secure traffic for w...

Tailscale

Tailscale is a zero trust identity-based connectivity platform built on WireGuard that connects devices, servers, workloads, and services across remote teams, multi-cloud environments, CI/CD pipelines...

Amazon Cognito

Amazon Cognito is an AWS identity and access management service that helps organizations implement secure authentication and authorization for customer applications, AI agents, microservices, and APIs...

Clerk

Clerk is an authentication and user management platform that helps teams add secure sign-up, sign-in, and account management flows to web and mobile applications. It provides prebuilt UI components, A...

ipdata

ipdata provides an IP geolocation and threat intelligence API for enriching IP addresses with location, organization, usage, and risk data.

Firebase Authentication

Firebase Authentication is a backend identity service for apps that need user sign-in across mobile, web, and other platforms. It provides SDKs and ready-made UI libraries for email and password accou...

Supabase

Supabase is a Postgres development platform that helps teams build backend infrastructure for modern applications. It combines a managed Postgres database with authentication, instant APIs, Edge Functions, realtime subscriptions, storage, and vector embeddings in a single platform.

Vault is HashiCorp's identity-based secrets management platform for securing credentials, certificates, keys, and other sensitive data across users, machines, services, and AI agents.

IP Geolocation API

Abstract API’s IP Geolocation API provides location intelligence for IP addresses, helping developers identify where a user is connecting from and enrich requests with useful contextual data.

Microsoft Entra ID

Microsoft Entra ID is Microsoft’s cloud identity and access management solution for securing users, applications, devices, and data across cloud and on-premises environments.