Authentication and user management platform for developers
Clerk is a developer-focused authentication and user management service for web and mobile applications.
AI Panel Score
6 AI reviews
Reviewed
AI Editor ApprovedApproved and published by our AI Editor-in-Chief after full panel analysis.Clerk is a developer-focused authentication and user management platform providing pre-built components and APIs for web and mobile applications, handling sign-up, sign-in, profile management, and session handling with customizable UI. It is aimed at developer teams shipping B2C and B2B SaaS, particularly on React or Next.js. Pricing is freemium: the free Hobby tier covers 50,000 monthly active users across unlimited applications, the Pro plan starts at $20 per month, and a Business tier runs $250 per month with custom Enterprise contracts above that. Key capabilities include drop-in UI components, multifactor authentication, bot detection and fraud prevention, organization management, and built-in subscription billing. TopReviewed's six-seat AI review panel scored it 8.0/10, praising the genuinely usable free tier while noting the $0.02 per-MAU overage meter scales with success rather than margin. It best fits solo founders and small teams shipping fast on Next.js.
Clerk is an authentication and user management platform designed for developers building web and mobile applications. It provides a complete authentication solution with pre-built UI components, APIs, and SDKs that can be integrated into applications with minimal code.
The platform offers various authentication methods including email/password, social logins (Google, Facebook, GitHub, etc.), passwordless authentication, and multi-factor authentication. Clerk handles the entire user lifecycle from registration and verification to profile management and session handling.
Clerk targets developers and development teams who want to implement secure, scalable authentication without building it from scratch. The service provides customizable UI components that match application designs, along with comprehensive user management features like organization support, role-based access control, and user analytics.
The platform competes in the authentication-as-a-service market alongside providers like Auth0, Firebase Authentication, and AWS Cognito. Clerk differentiates itself with developer-friendly APIs, modern UI components, and a focus on ease of implementation for both experienced developers and those new to authentication systems.
Adds secure, consent-driven access to applications backed by Clerk's authentication and authorization for agentic use cases.
Provides UI components and APIs for onboarding and managing users and organizations in multi-tenant SaaS applications, including invitations and auto-join by email domain.
Gives every user secure, production-ready API keys without requiring developers to build underlying boilerplate code or UI.
Provides powerful primitives to fully customize an application's authorization with custom roles and permissions for multi-tenant B2B use cases.
Pre-built pixel-perfect components for authentication, profile management, organization management, and billing that can be embedded in minutes and matched to any brand with any CSS library.
Improves sign-up conversion rates and filters out spam and fraud by sending users a magic link for passwordless authentication.
Adds social sign-on to applications with 20+ provider options including Google and GitHub.
Adds subscription billing to B2C or B2B applications via drop-in React components without requiring custom payment code, UI, or webhook handling.
Reduces fraudulent sign-ups using built-in, continually updated machine learning.
Blocks high-risk disposable email domains and restricts use of email subaddresses with the '+' separator to reduce fraudulent sign-ups and free trial abuse.
Each user's self-serve multifactor settings are enforced automatically during sign-in.
Manages the full session lifecycle including active device monitoring and session revocation.
Free tier for development. 50,000 MAU included, up to 3 dashboard seats.
Annual billing. 50,000 MAU included then $0.02/MAU. Removes Clerk branding, adds MFA.
Annual billing. For growing teams; includes SOC 2 report, enhanced roles, 30-day log retention.
Custom annual contract with SLAs and compliance options.
Anthropic's Anthology Fund co-led Clerk's $50M Series C — agent identity is now the wedge.
“Clerk closed a $50M Series C in October 2025 with Menlo and Anthropic's Anthology Fund as co-leads, bringing total raised to $134M across seven rounds. Drop-in UI Components still anchor the developer wedge against Auth0, but agent identity is the new bet that needs to land in the next three years.”
Agent identity is the pitch now. Anthropic's Anthology Fund co-led the $50M Series C in October 2025 alongside Menlo — a customer leading the round tells you who they're building for next. Auth0 doesn't have that story.
Brothers Colin and Braden Sidoti founded Clerk in March 2019 out of San Francisco; $134M total across seven rounds, roughly 80 people. Drop-in UI Components are the developer wedge — SignIn and SignUp embedded in an afternoon with any CSS library. Pro runs $25 a month with 50,000 MAU included, then $0.02 per MAU.
But the Stripe Billing add-on is a real tax — Clerk charges 0.7% on billing volume on top of Stripe's 2.9% plus $0.30. Firebase Authentication is still free at the bottom, and Cognito isn't disappearing on the AWS side. Pilot Pro on one production app for a quarter before the standardization memo.
Strong developer mindshare but Auth0 still owns enterprise and Firebase Authentication owns hobbyist.
Stripe strategic partnership and Anthropic-backed funding make this a defensible board pick.
Drop-in UI Components and SDKs ship SignIn and SignUp in hours, not sprints.
Auth plus the new agent-identity pivot lines up with where modern apps and AI agents are heading.
$134M raised across seven rounds with Menlo and Anthropic's Anthology Fund co-leading the October 2025 Series C.
Developer teams who need pre-built authentication for a Next.js or React app.
Enterprises who need self-hosted identity or deep IAM customization.
Clerk's Organizations primitive ships B2B multi-tenancy with the rest of auth — WorkOS still wins enterprise SSO.
“Brothers Colin and Braden Sidoti shipped Clerk Organizations as a first-class data model — orgs, members, roles, invitations baked into the SDK. For a CTO picking the B2B auth substrate through 2029, the call is whether shipping multi-tenancy with the auth layer beats stitching WorkOS or Stytch underneath.”
Most B2B SaaS teams build the org/member/role tables twice — once on day one, again when the first enterprise customer asks for SAML. Clerk Organizations ships that whole data model through hooks like useOrganization() across React, Remix, Astro, and Expo SDKs.
Business at $250 monthly opens SAML and OIDC SSO into Okta and Entra ID, which is where enterprise contracts start. Custom Roles and Permissions sit alongside, so RBAC isn't a separate vendor. Pro covers 50,000 MAU then $0.02 per user.
But the catch is the seam. Clerk owns the org primitive end-to-end, so a 2029 migration to WorkOS or Stytch rewrites the data model, not just the auth flow. For a CTO picking the B2B auth substrate through three years, the convenience is also the lock-in.
Positioned between Auth0's enterprise tax and Firebase Authentication's free default, with $134M raised behind the bet.
useOrganization() hooks across React, Remix, Astro, Expo match how senior frontend and backend teams actually compose auth.
SDK breadth covers Next.js, Remix, Astro, Expo plus SAML and OIDC into Okta and Entra ID on the $250 Business tier.
Owning the org primitive end-to-end creates real data-model lock-in if a 2029 migration to WorkOS becomes the call.
The Organizations data model — orgs, members, roles, invitations — is best-in-class B2B auth craft, not a thin wrapper.
CTOs at B2B SaaS startups who need multi-tenant auth shipped fast.
Enterprise teams who require WorkOS-grade SSO-only contracts.
Clerk's MAU meter beats Auth0's per-MAU sticker — but the 0.7% Billing tax surprises procurement.
“Clerk prices four tiers visibly — Hobby free, Pro $25, Business $250, Enterprise custom — with 50,000 MAU included then $0.02/MAU overage. $134M raised across seven rounds since 2019, with Madrona leading the $15M Series A and CRV leading the $30M Series B.”
$134M raised across seven rounds. Madrona led the $15M Series A in March 2023; CRV led the $30M Series B in January 2024, Stripe joining strategically. Founded 2019 by brothers Colin and Braden Sidoti. Four tiers visible — Hobby free, Pro $25, Business $250, Enterprise custom.
Pro covers 50,000 MAU then $0.02 per MAU. A B2C app at 200,000 MAU runs $3,025/month — $36,300/year. Compare Auth0 B2C Essentials at $35/month for 500 MAU. Clerk wins at scale.
The catch is Subscription Billing. Clerk layers 0.7% on top of Stripe's 2.9% + $0.30. On $1M billing volume, that's $7,000 to Clerk on top of $29,300 to Stripe. The $100/month enhanced B2B add-on for unlimited org members is a second meter.
Self-serve checkout on Pro and Business removes procurement friction below Enterprise.
Monthly Pro available; Business and Enterprise are annual with standard auto-renewal terms.
Four tiers visible without a sales call; $0.02/MAU overage and tiered discounts to $0.012 above 10M MAU published.
Per-MAU cost is directly measurable against active user counts in the dashboard.
MAU overage is predictable but Subscription Billing layers 0.7% on Stripe fees and B2B add-on adds $100/month.
Developers who ship B2C and B2B SaaS at scale.
Buyers who need a single flat-fee invoice without usage metering.
Clerk's Organization Management collapses the multi-tenant B2B sprint — until JWT templates hit production.
“Organization Management ships the multi-tenant primitives most B2B apps spend a week building — invitations, auto-join by email domain, and the OrganizationSwitcher component. But JWT template customization is shallow, and the $100/month enhanced B2B add-on gates unlimited org members and Custom Roles.”
Multi-tenant SaaS work means shipping auth and the org layer in the same sprint. Clerk's Organization Management bundles invitations, auto-join by email domain, and an OrganizationSwitcher component — collapsing what's usually a week of modeling org_users tables in Postgres against NextAuth.js.
Pro at $20/month covers 50,000 MAU. The $100/month enhanced B2B add-on lifts the 20-member organization cap and unlocks Custom Roles and Permissions. The has() helper drops into Next.js middleware without a separate authorization library. Docs read engineer-fluent — TypeScript samples for App Router, Remix, and Express.
But JWT templates are where the polish runs out. Custom session claims need a template per resource server, and the editor doesn't validate against your schema before issuing tokens. WorkOS feels heavier on the SDK side; Stytch is leaner but its React primitives aren't polished. Magic Links default to email-only.
OrganizationSwitcher and the has() helper survive past the demo, but JWT template customization wears thin.
Docs ship working TypeScript code samples per framework, not marketer prose.
JWT template editor weakness and Magic Link email-only defaults add up as daily friction.
Custom Roles, webhooks, and session tokens exist but advanced flows sit behind the enhanced B2B add-on.
Next.js App Router, Remix, and Express middleware all get first-class SDK support.
Engineers shipping multi-tenant B2B SaaS who want org primitives in the SDK.
Backend teams who need deep JWT claim customization across many resource servers.
Clerk turns the auth boilerplate everyone hates into a paste-in component — that's the whole sell.
“Clerk gives developers pre-built sign-in, organizations, and billing components with a free 50,000 MAU tier and Pro at $20/month. The pieces look good out of the box, but the meter and the lock-in are the conversation.”
Sign-in pages all look the same because most developers shouldn't be designing them. Clerk's Drop-in UI Components are the rare auth screens that don't make you wince — and that matters because users see them before they see anything else you built.
Hobby is free up to 50,000 MAU. Pro is $20/month, then $0.02 per user past the threshold. Founded 2019 by Colin and Braden Sidoti, $30M Series B from CRV and Stripe in January 2024. Subscription Billing now sits in the same SDK, which is the Stripe partnership doing real work. Auth0 owns enterprise; Firebase Authentication is the free default; Supabase Auth comes bundled.
But the meter scales with success, and migrating off Clerk later means rewriting the auth surface most apps treat as load-bearing. The MCP Server addition reads like a 2026 bet on agentic flows. For solo founders shipping fast, the math and the polish hold up.
Pre-built components are pixel-careful — the bar most auth screens fail to clear.
Easy first hour; B2B Organization Management and custom roles get denser at month three.
iOS and Android SDKs exist but the value lives in the web flow.
Drop-in components and the SDKs get you to working auth in minutes, not days.
Session Management and SOC 2 on Business tier signal a real production-grade backend.
Solo founders and small teams who ship fast on React or Next.js.
Enterprises who need on-prem deployment or strict vendor neutrality.
WorkOS owns enterprise SSO; Clerk's $50M Series C bets MCP Server makes agent identity a category.
“Clerk closed a $50M Series C in October 2025 led by Menlo and Anthropic's Anthology Fund — 200 million users, 15,000 apps, agent identity now the pitch. The catch is whether MCP Server defines a category or whether WorkOS and Auth0 absorb it as another OAuth flow.”
Agent Identity is the new pitch. Whether that's a category or a feature in someone else's product is the open question. Menlo and Anthropic's Anthology Fund led $50M in October 2025 — $184M total across eight rounds now. 200 million users, 15,000 apps. Real distribution.
MCP Server is the artifact behind the pitch. Consent-driven agent access on the same SDK devs already paste in. Pro stays honest at $20 — 50,000 MAU free, then $0.02 per MAU. Business at $250 unlocks SOC 2 and 30-day log retention.
But WorkOS owns the enterprise SSO and SCIM lane Clerk's roadmap still points at. The catch is the bet — if agent identity collapses back into general OAuth, the moat shrinks to component polish. Exit isn't clean; auth is load-bearing. Worth a Pro seat, hedged on the agent thesis.
Component polish plus MCP Server is a real wedge, but WorkOS owns enterprise SSO and SCIM.
Auth is load-bearing; migrating off Clerk means rewriting the sign-in surface.
$184M raised across eight rounds with Anthropic strategic — capital and distribution are real.
Agent Identity is positioning, but the pricing page lists concrete tier limits and per-MAU math.
Six years shipping, 200 million users, 15,000 apps — survives the cohort.
Developers shipping B2C apps who want auth boilerplate gone in an afternoon.
Enterprises buying for SAML SSO and SCIM provisioning depth.
Common questions answered by our AI research team
After the 50,000 included MRUs on the Pro plan, the cost is $0.02/mo each for 50,001–100,000 MRUs. Volume discounts apply at higher tiers: $0.018/mo each for 100,001–1,000,000, $0.015/mo each for 1,000,001–10,000,000, and $0.012/mo each above 10,000,001.
The content describes bot detection and fraud/abuse prevention (including blocking disposable email domains and restricting email subaddresses with the '+' separator) as general features, but does not specify which plan tiers these are available on or limited to.
To remove the 'Secured by Clerk' branding from pre-built UIs, you must upgrade to the Pro plan or higher. The Hobby (free) plan does not include this option, while Pro and Business plans both include it.
Yes, Clerk's Billing add-on integrates directly with Stripe. On top of Stripe's standard 2.9% + $0.30 transaction fee, Clerk charges an additional 0.7% of billing volume.
The free tier included in all plans provides: 100 MRO per app, up to 20 members per organization, Admin & Member roles, custom permissions, and invitations. The $100/mo (or $85/mo billed annually) enhanced B2B add-on adds: unlimited members per organization, link Enterprise connections with organizations, verified domains & automatic invitations, and custom roles & rolesets.
Company
ClerkFounded
2019Pricing
From $20/moFree Plan
Available
Clerk is a San Francisco-based authentication and user management service purpose-built for modern web frameworks like Next.js and React.
