
Clerk
Secure authentication APIs and SDKs for React and Next.js developers
Recommended for
- Solo / Indie
- Idea-Stage
- Pre-Seed
- Seed
- Series A
- Scaleup
- Late-Stage
- Public / Enterprise
SSIE
Stage Fit Recommendations
Following data shows why Clerk is recommended for listed teams. The Fit Score represents the percentage fit of Clerk to each company stages, as calculated by the SSIE.
Stage
Fit Score
Fit Reasons
Solo / Indie
$0–$2,000 MRR
86- CCPA / CPRA - baseline compliance certification
- Free trial available to evaluate before purchasing
Idea-Stage
$0
88- Data export and portability
- Self-serve signup from $0.02/mo, no sales call required
Pre-Seed
$0–$10k MRR
91- Supports multi-tenancy with organization creation, switching, and management
- Open-source codebase, independently reviewable
Seed
$10k–$100k MRR
94- Offers billing integration with subscription management and feature gating
- Public API documentation for developers
Series A
$100k–$500k MRR
94- Role-based access control with admin audit logging
- Data residency and regional hosting controls
- Multi-factor authentication
- Third-party penetration testing
- Active security and vulnerability disclosure programme
- HIPAA - regulated-industry certification
- PCI DSS - regulated-industry certification
- Includes prebuilt components for sign-up, sign-in, user profile, and waitlist
Scaleup
$500k–$2M+ MRR
91- Enterprise procurement path with custom contracts and DPA
- Multiple support channels (chat, email)
Late-Stage
$2M+ MRR
88- SOC 2 Type II - core enterprise certification
- Blocks disposable email addresses and email subaddresses to reduce fraud
Public / Enterprise
$100M+ ARR
86- SSO / SAML on the Enterprise plan
- Uptime SLA on the Enterprise plan
- ISO/IEC 27001 - core enterprise certification

Description
Clerk delivers enterprise-grade authentication and user management built for modern web frameworks like React, Next.js, and Remix. Developers integrate pre-built UI components for sign-up, sign-in, and profile management in minutes, while retaining full control over branding and custom domains. The platform supports multi-factor authentication, session management, and scalable organization handling—all through a single API. Free trial available for teams evaluating secure, compliance-ready authentication solutions. Ideal for developer tools and security-focused applications needing reliable APIs and SDKs.
Pricing
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