Auth Tools
Get told when a new site picks a Auth tool.
Stackdar watches every launch we detect and sends you the ones that ship with anything in Auth, your competitors' tools included, by email, Slack or webhook. On every plan, from £15 a month.
See how alerts workThe most-adopted auth tool we track is Google Sign-In (98,750 sites). We've detected 170 auth tools across 158,841 public sites.
Auth tools we've detected
| Tool | 90‑day | Sites |
|---|---|---|
Google Sign-In
site ↗
Google Identity Services sign-in.
|
98750 | |
Clerk
site ↗
Drop-in authentication and user management service for React, Next.js, and other modern frontends.
|
26616 | |
Auth.js
site ↗
Auth.js (formerly NextAuth.js v4, rebranded as Auth.js v5): open source authentication library for Next.js / SvelteKit / SolidStart / Express.
|
25271 | |
Google Identity Platform
site ↗
Authentication service providing sign in, federation and user management, also used by Firebase Authentication.
|
3604 | |
Privy
site ↗
Web3 wallet infrastructure and authentication platform powering 120M+ accounts
|
1704 | |
Google OAuth
site ↗
Sign-in-with-Google identity flow, lets sites authenticate users via their Google account.
|
1647 | |
Stytch
site ↗
Developer-focused authentication and identity platform.
|
1612 | |
Apple Sign In
site ↗
Federated authentication that lets people sign in to apps and websites with their Apple ID.
|
1500 | |
Netlify Identity
site ↗
Open-source identity and user authentication service used with Netlify Identity.
|
1366 | |
|
OTPless
site ↗
Passwordless authentication service for OTP-free login via WhatsApp, Gmail and other channels
|
891 | |
|
Microsoft Authentication Library
site ↗
Microsoft Authentication Library (MSAL): Microsoft Entra ID sign-in browser library.
|
448 | |
AWS Cognito
site ↗
Amazon Web Services managed user authentication, authorisation, and identity service.
|
446 | |
|
Microsoft Entra ID
site ↗
Microsoft's cloud identity service providing single sign-on, multi-factor authentication and customer identity management.
|
358 | |
Auth0
site ↗
Identity-as-a-service platform from Okta offering social login, SSO, and user management for web and mobile apps.
|
287 | |
Better Auth
site ↗
TypeScript authentication framework for Node.js.
|
259 |
Showing top 15 of 170 auth tools by adoption. 155 more not shown.
The StackScope API serves every auth tool and the launches using each, filterable and exportable, from £15 a month.
Launches using Auth tools
| Launch | Launched | Score |
|---|---|---|
| EcomAgentTools | Oct 17, 2026 | 9.5 |
| Ozil AI: Ozil Goal AI Video Generator From One Photo | Oct 16, 2026 | 9.5 |
| Kapwing | Oct 16, 2026 | 8.6 |
| Sufuku | Oct 16, 2026 | 10.0 |
| Nevermined | Oct 16, 2026 | 10.0 |
| AEO for B2B by zRev AI | Oct 16, 2026 | 10.0 |
Often built with
Categories the auth sites we track also commonly use: