Clerk

Drop-in authentication and user management for modern web and mobile apps.

DevTools 📍 Burlingame, CA Founded 2019

Current Valuation

Private

as of 2025-Q4

PRIVATE

Clerk provides drop-in authentication, user management, and organization/billing primitives for web and mobile applications, with a developer-experience-first focus. The company manages over 200 million users across 15,000+ applications and is investing heavily in 'Agent Identity' — authentication primitives for AI agents acting on behalf of humans. Backed by Menlo Ventures, Anthropic's Anthology Fund, Georgian, CRV, Madrona, and Stripe.

Company Profile

CEO

Colin Sidoti

Founded

2019

Burlingame, CA

Employees

~80

Total Raised

$134M

Last Round

Series C — $50M (Oct 2025) · Lead: Menlo Ventures and Anthropic's Anthology Fund

IPO Status

private

Founders & Key People

Colin SidotiBraden SidotiBryce Bartmess

Investors

Menlo Ventures · Anthropic Anthology Fund · Georgian · CRV · Madrona Venture Group · Stripe · Y Combinator

Products

Authentication
User Management
Organizations / Multi-tenancy
Billing (Stripe integration)
Pre-built UI Components (<SignIn />, <SignUp />)

Competitors

Auth0 (Okta) · Stytch · WorkOS · Supabase Auth · Firebase Auth

DevToolsAuthenticationB2B SaaS