Clerk, Inc.
Clerk provides complete authentication and user management solutions for modern web applications, enabling developers to launch faster with best-in-class security and user experience. The company is expanding from authentication into full user management with business primitives like billing and authorization.
At a Glance
- React and Next.js developers
- Modern web framework developers (Remix, Astro, etc.)
- SaaS companies (B2C and B2B)
- AI/ML companies
- +4 more
AI Tools by Clerk, Inc.
(1)Clerk
User Auth and Management SDK
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Latest News
Clerk raises $50M Series C led by Menlo Ventures and Anthropic's Anthology Fund to focus on Agent Identity
Passkeys are now Generally Available
Passkeys launched in Beta
Clerk raises $30M Series B from CRV and Stripe to expand into Authorization
Products & Services
Core authentication platform with pre-built components for sign-up, sign-in, and user profile management. Purpose-built for React, Next.js, Remix, and modern web frameworks.
Multi-tenancy solution with organization management, custom roles and permissions, SAML SSO, verified domains, automatic invitations, and enterprise connections.
Subscription billing solution integrated with Stripe that requires no payment integration code, UI work, or webhook management. Includes pricing components and billing-aware authorization for plan-based access control.
AI-native authentication capabilities for agentic workflows and AI agents, addressing authentication challenges in the age of autonomous AI systems.
Market Position
Clerk differentiates itself as a component-first authentication platform purpose-built for React and modern web frameworks, in contrast to API-first competitors like Auth0, WorkOS, and Stytch. Key differentiators include: (1) Pre-built, customizable UI components that reduce development time, (2) Developer experience focused on modern JavaScript frameworks, (3) Expansion beyond authentication into full user management including billing and organizations, (4) Strategic positioning for AI-native authentication with Agent Identity capabilities, (5) Self-serve platform with predictable per-user pricing vs enterprise-focused competitors.
Leadership
Founders
Colin Sidoti
Co-founder and CEO of Clerk. Has a degree from MIT and a degree in computer science from University of California, Berkeley. Prior to Clerk, he was co-founder and CTO of Harbor Inc., a software development consultancy. Also worked as an independent consultant and web developer.
Braden Sidoti
Co-founder and CTO of Clerk. Graduated from Washington University in St. Louis and previously worked at Uber and Inspirato. Brother of Colin Sidoti.
Executive Team
Colin Sidoti
Co-Founder & CEO
MIT graduate with computer science degree from UC Berkeley. Previously co-founder and CTO of Harbor Inc.
Braden Sidoti
Co-Founder & CTO
Graduated from Washington University in St. Louis. Previously worked at Uber and Inspirato.
Board of Directors
Founding Story
Clerk was founded in March 2019 by brothers Colin and Braden Sidoti with a simple insight: many third-party service integrations are abstracted onto the User object (like user.subscribe() and user.email()). They imagined a service could offer a User object with these extensions built-in. They started by building an incredibly easy-to-use authentication service that would enable them to extend the User object in the future. The founders aimed to capitalize on the shift in developer tools from APIs to components and the rise of React to make building applications significantly easier.
Business Model
Revenue Model
API usage-based pricing and subscription tiers. Primary revenue from monthly recurring users (MRU) and monthly recurring organizations (MRO) with add-ons for B2B authentication, billing (0.7% of billing volume), and administration features. Self-serve platform with usage-based pricing.
Pricing Tiers
50,000 MRU limit per app, unlimited applications, 3 dashboard seats, up to 5 user impersonations, APIs and prebuilt UIs, most authentication features, custom domain, fixed 7-day session lifetime
Everything in Hobby plus: 50,000 MRU included per app ($0.02/mo each additional), 1 Enterprise connection included ($75/mo each additional), remove Clerk branding, MFA, satellite domains ($10/mo each), custom session lifetime, SMS authentication
Everything in Pro plus: 10 dashboard seats included ($20/mo each additional), SOC2 Report & HIPAA compliance, enhanced dashboard roles, priority support, audit logs (coming soon)
Everything in Business plus: annual committed use discounts, 99.99% Uptime SLA, premium support SLA with dedicated Slack channel, onboarding & migration support
Target Markets
- React and Next.js developers
- Modern web framework developers (Remix, Astro, etc.)
- SaaS companies (B2C and B2B)
- AI/ML companies
- Fintech companies
- E-commerce platforms
- SaaS applications requiring user authentication
- B2B multi-tenant applications
- AI applications and agentic workflows
- Fintech applications
- E-commerce platforms
- React and Next.js applications
- Browserbase
- Inngest
- Profound
- Braintrust