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 (18,255 sites). We've detected 119 auth tools across 51,407 public sites.
Auth tools we've detected
| Tool | 90‑day | Sites |
|---|---|---|
Google Sign-In
site ↗
Google Identity Services sign-in.
|
18255 | |
Auth.js
site ↗
Auth.js (formerly NextAuth.js v4, rebranded as Auth.js v5): open source authentication library for Next.js / SvelteKit / SolidStart / Express.
|
14773 | |
Clerk
site ↗
Drop-in authentication and user management service for React, Next.js, and other modern frontends.
|
14469 | |
Google Identity Platform
site ↗
Authentication service providing sign in, federation and user management, also used by Firebase Authentication.
|
1921 | |
Google OAuth
site ↗
Sign-in-with-Google identity flow, lets sites authenticate users via their Google account.
|
1002 | |
Apple Sign In
site ↗
Federated authentication that lets people sign in to apps and websites with their Apple ID.
|
763 | |
Privy
site ↗
Web3 wallet infrastructure and authentication platform powering 120M+ accounts
|
731 | |
Stytch
site ↗
Developer-focused authentication and identity platform.
|
697 | |
Netlify Identity
site ↗
Open-source identity and user authentication service used with Netlify Identity.
|
584 | |
|
OTPless
Passwordless authentication service for OTP-free login via WhatsApp, Gmail and other channels
|
253 | |
|
Microsoft Authentication Library
Microsoft Authentication Library (MSAL): Microsoft Entra ID sign-in browser library.
|
219 | |
Auth0
site ↗
Identity-as-a-service platform from Okta offering social login, SSO, and user management for web and mobile apps.
|
168 | |
|
Microsoft Entra ID
Microsoft's cloud identity service providing single sign-on, multi-factor authentication and customer identity management.
|
168 | |
AWS Cognito
site ↗
Amazon Web Services managed user authentication, authorisation, and identity service.
|
167 | |
|
WorkOS
Enterprise SSO, SCIM, and audit log APIs for SaaS apps that need to support enterprise customers.
|
154 |
Showing top 15 of 119 auth tools by adoption. 104 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 |
|---|---|---|
| The Daily Set | Sep 1, 2026 | 6.7 |
| Gem-manatee-cd0 | Sep 1, 2026 | 7.0 |
| Orthogonal | Sep 1, 2026 | 7.3 |
| The-rewind | Sep 1, 2026 | 8.5 |
| Rxlab market | Sep 1, 2026 | 3.0 |
| SenderSignal | Sep 1, 2026 | 7.6 |
Often built with
Categories the auth sites we track also commonly use: