Best Auth for AI 2026: Auth0 vs Clerk vs WorkOS vs Stytch

TL;DR + decision tree

Five providers, five branches. Read down until your situation matches; the rest of this post is the evidence behind the branch.

• You’re an enterprise buying through Okta procurement and you need every box ticked — Organizations, FGA, custom Actions, SAML, SCIM, compliance attestations. Pick Auth0. You will pay for it.
• You’re a React or Next.js shop shipping a consumer or mid-market product and want auth working by lunch. Pick Clerk. The pre-built components save you a sprint.
• Your AI tool sells to mid-market and enterprise customers who demand SAML and SCIM at the procurement stage. Pick WorkOS. Pay-per- connection economics beat seat-based pricing under most scenarios, and AuthKit’s MCP authorization story is the most explicit in this comparison.
• Your product is passwordless-first — magic links, biometrics, passkeys are the headline UX — particularly if you’re building a consumer mobile app. Pick Stytch.
• You want to design auth flows visually, hand them off to a PM or designer, and iterate without shipping code. Pick Descope. Newer entrant, steeper learning curve outside the flow builder.

These five aren’t mutually exclusive. A common stack in 2026 is Clerk (or Stytch) for the consumer login UX plus WorkOS underneath for enterprise SSO and SCIM — your buyers see a polished sign-up flow, your IT teams get the SAML connection they asked for. We touch on that hybrid in the per-tool sections.

Why auth matters more for AI apps in 2026

Authentication has always been load-bearing. What changed for AI apps in 2026 is three structural shifts that pulled auth from “done in a sprint” back to “design doc.”

Shift one: remote MCP servers. The Model Context Protocol’s streamable-HTTP transport went from draft to production over 2025, and by mid-2026 every serious MCP server in our directory ships a remote endpoint. Remote means OAuth — specifically OAuth 2.1 with PKCE, dynamic client registration per RFC 7591, and OAuth-protected resource metadata so clients can discover the auth server with zero config. Your AI app’s auth provider is now also the authorization server for any MCP server you publish, which means “does this auth provider implement the MCP authorization spec cleanly” is now a real procurement question. Our OAuth 2.1 for remote MCP deep dive covers the wire format if you want it bottom-up.

Shift two: B2B AI tools selling to enterprises. A noticeable share of AI startups built in 2024-2025 are now closing their first $100k+ contracts — which means their procurement teams hit a wall labeled “does this product support SAML and SCIM.” If the answer is no, the contract doesn’t close. The cheapest way for an AI startup to answer “yes” without rewriting auth is bolting WorkOS underneath the existing login — or upgrading from Clerk Pro to Clerk Business, or from Auth0 B2C to Auth0 B2B, or from Stytch Pay-As-You-Go to Stytch with paid SSO connections. The bill for enterprise SSO is now a line item in nearly every Series A AI startup’s budget.

Shift three: agents acting on behalf of users. The model called your tool. The tool needs to know which user made the request and what scopes that user granted the agent. That’s OAuth’s original use case — third-party app acting on behalf of a user — applied to an LLM rather than a website. The patterns are settled: the agent holds an access token issued to the user, your API verifies it like any other bearer token, and the user’s consent screen lists the agent’s requested scopes. The thing that differs by provider is how cleanly they handle the agent-app registration: WorkOS AuthKit has dynamic client registration wired up explicitly for MCP clients; Auth0 supports it through its API but requires more assembly; Clerk and Stytch handle OAuth flows but their docs are oriented toward standard SaaS use cases rather than MCP-shaped agent flows. Descope’s flow builder can model the consent step visually.

Net effect: auth in 2026 isn’t the boilerplate it was in 2022. The provider you pick now signs you up for choices about MCP authorization, B2B SSO economics, and agent consent UX that you used to be able to defer. The five axes below are how to make those choices explicit instead of accidental.

Five axes that decide it

We rated each provider on five axes. Every cell below is sourced from official docs or pricing pages — no synthetic benchmarks, no vendor sponsorship. Treat the matrix that follows as the summary; the per-tool sections are the evidence.

Axis 1: Developer experience (DX). How fast can a single engineer go from npm install to working auth in a Next.js app, end-to-end including session management, protected routes, and a sign-out button? Clerk wins because of pre-built React components and Next.js middleware shipped with the SDK; Stytch is second; WorkOS AuthKit and Descope cluster mid-pack; Auth0 has the most comprehensive docs but the most surface area to navigate.

Axis 2: B2B SSO depth. How well does the provider handle SAML, SCIM, IdP-initiated SSO, and directory-sync from Okta, Azure AD, Google Workspace, and JumpCloud? WorkOS leads — it’s the entire product story. Auth0 is comprehensive but at the Enterprise tier. Stytch and Descope handle SSO but the per-connection setup ergonomics are less polished. Clerk handles SAML at Business tier but the Organizations primitive is younger than Auth0’s.

Axis 3: Passwordless depth. Magic links, OTP, passkeys, biometrics — how first-class are they versus bolted on? Stytch leads (it’s the product premise). Clerk is close behind with passkeys in the default sign-in component. Auth0 supports passkeys but requires more configuration. WorkOS AuthKit includes passkeys in the hosted screen. Descope supports them as flow-builder nodes.

Axis 4: Pricing shape. What does the unit economics curve look like as your MAU climbs? Clerk wins for indie and seed-stage (50,000 MRU included on Pro at $25/month). WorkOS wins for high-SSO low-MAU shapes ($0 for first 1M AuthKit MAUs, $125 per SSO connection). Stytch wins for passwordless-heavy consumer shapes (10,000 MAU free, paid add-ons). Auth0 is the most expensive at small scale but converges with enterprise volume discounts. Descope sits mid-pack ($249/month for 10,000 MAU at Pro).

Axis 5: MCP / OAuth fit. How explicitly does the provider support the OAuth 2.1 + MCP authorization spec — dynamic client registration, OAuth-protected resource metadata, PKCE for public clients, and consent screens that handle agent-shaped scopes? WorkOS AuthKit ships documented MCP authorization out of the box. Auth0 ships its own MCP server for tenant management (a different thing) and supports the OAuth flows but you assemble more pieces. Clerk, Stytch, and Descope handle OAuth 2.1 broadly but don’t market MCP-specific docs yet — that’s likely to change in 2026.

Side-by-side matrix

Every cell is sourced from the official docs or vendor pricing page as of May 2026.

Three takeaways. First, none of these are open-source — auth is the category where managed services dominate because the security bar is high and the maintenance cost of a self-built IdP is rarely worth it. Second, only WorkOS markets MCP authorization as a first-class feature; everyone else supports the protocol but you do more assembly. Third, the free-tier MAU numbers are not directly comparable because WorkOS’s free million is AuthKit-only (no SSO connections, those are per-connection), while Clerk’s 50,000 MRU is the full feature set on the free Hobby tier. Apples and oranges; use the per-tool sections to align with your actual shape.

Auth0 — pick + recipe

Auth0auth0

Official1-Click Ready

Integrate Auth0 with AI agents to manage Auth0 operations using natural language. Easily create apps and retrieve domain

cloud infrastructureauth security6672

What it does best

Auth0’s strength is breadth. Universal Login as the hosted screen, Actions for inline logic during sign-up and sign-in, Rules for legacy customers, Organizations as the B2B primitive, Fine-Grained Authorization (FGA) for relationship- based access control, Anomaly Detection for brute-force and breached-password protection, native enterprise SSO across every major IdP, MFA, passkeys, and a tenant-level MCP server (@auth0/auth0-mcp-server) that lets an agent create applications, deploy Actions, and query logs without a dashboard click. Whatever the feature is, Auth0 probably has it — the cost of that breadth is a learning curve and pricing that scales with each capability you light up.

Pick this if you...

• Already buy enterprise software through Okta procurement and want the path of least resistance for compliance attestations
• Need the full B2B Organizations model with custom roles, FGA, and audit logs procurement teams will inspect
• Want an Actions and Rules pipeline you can inject custom TypeScript into during sign-up, sign-in, or token issuance
• Want an MCP server pointed at your auth tenant itself — the Auth0 MCP lets an agent provision apps, deploy Actions, and tail logs from your editor

Recipe: protect a Next.js API route + add the MCP for tenant admin

Two commands, two outcomes. The first protects your app; the second gives your editor an agent that can manage the Auth0 tenant itself.

# 1. App auth (the normal Next.js integration)
npm install @auth0/nextjs-auth0

# in app/api/auth/[auth0]/route.ts
import { handleAuth } from '@auth0/nextjs-auth0';
export const GET = handleAuth();

# 2. Tenant management MCP (initialize, then add to Claude/Cursor)
npx @auth0/auth0-mcp-server init

The first block is the standard Auth0 Next.js integration — add the Auth0 domain, client ID, and client secret to .env.local, wrap protected pages in withPageAuthRequired, and you have working OAuth in one route file. The second block runs the official Auth0 MCP server in init mode: it walks you through a device authorization flow, asks which tools to enable, and writes the config block into your MCP client (Claude Desktop, Cursor, VS Code, Windsurf). From then on, your agent can list and create Applications, deploy Actions, list Resource Servers, and tail logs — useful for “create a new connection for this tenant” without leaving your editor. Sensitive fields like client_secret are redacted in responses, and you can scope tool access with --tools and --read-only flags.

Skip it if...

You’re an early-stage AI startup with 1,000 paying customers, no enterprise contracts yet, and a finite seed round. Auth0 B2C Professional is $240/month for 500 MAUs and B2B Professional is $800/month at the same scale — you will spend a sizeable fraction of your auth budget on features you don’t yet use. Clerk or Stytch get you the same login experience for under $50/month at that scale; upgrade later if the feature gap matters.

Clerk — pick + recipe

Clerkclerk

Official1-Click Ready

Securely manage Clerk authentication, users, sessions, orgs, and authorization for seamless identity and access control.

ai mldeveloper tools2841

What it does best

Clerk’s strength is developer experience for React and Next.js shops. The pre-built components — <SignIn />, <SignUp />, <UserButton />, <OrganizationSwitcher /> — ship with sensible defaults, Tailwind theming, and Next.js middleware that handles protected routes via a one-line export. From npm install to working auth with social login, magic links, passkeys, and a styled user-profile drawer is under 30 minutes for a developer who has done it once. The Hobby tier includes 50,000 monthly resident users (MRU) at $0, which puts Clerk in the “ship the MVP, worry about the bill later” bucket for most consumer and B2B SaaS projects.

Pick this if you...

• Are shipping a React, Next.js, Remix, or Expo app and want auth working before your standup ends
• Want first-class TypeScript types, hooks, and middleware that match the runtime behavior with no surprise mismatches
• Are happy customizing Clerk’s pre-built UI rather than building one from scratch — saves a sprint
• Have a B2B SaaS where Clerk’s Organizations primitive (workspaces, invites, roles) covers your tenancy needs

Recipe: protect a Next.js App Router route in 4 lines

The fastest path from zero to working auth in this entire comparison. Install, set keys, wrap with middleware, render the button.

# install
npm install @clerk/nextjs

# middleware.ts (the entire file)
import { clerkMiddleware } from '@clerk/nextjs/server';
export default clerkMiddleware();

# app/layout.tsx (the wrapper)
import { ClerkProvider, SignedIn, SignedOut, SignInButton, UserButton } from '@clerk/nextjs';

export default function RootLayout({ children }) {
  return (
    <ClerkProvider>
      <SignedOut><SignInButton /></SignedOut>
      <SignedIn><UserButton /></SignedIn>
      {children}
    </ClerkProvider>
  );
}

That’s the entire integration. Set NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY and CLERK_SECRET_KEY in .env.local, and Clerk handles sign-up, sign-in, social providers, magic links, passkeys, and the user profile drawer with zero additional code. The middleware automatically protects every route except ones you explicitly mark public. Pair it with OAuth 2.1 patterns if you’re also publishing an MCP server — Clerk doesn’t ship dedicated MCP docs yet but the OAuth primitives are present in their hosted plans.

Skip it if...

You need enterprise SSO before you hit Business tier ($300/ month monthly billing), or your design system rejects Clerk’s component aesthetic and you’d rather build from scratch. The pre-built components are themeable but they look like Clerk components unless you spend real effort customizing — design teams with strict brand guidelines sometimes fight this. Also skip if your B2B model needs FGA- style relationship-based authorization; Clerk’s Organizations primitive is solid but not as deep as Auth0’s.

WorkOS — pick + recipe

What it does best

WorkOS is the cleanest answer for B2B AI tools that need enterprise SSO and SCIM without paying enterprise prices on the rest of the auth stack. The pay-per-connection model is the killer feature: $125 per SSO or SCIM connection at low volume, falling to $50 each above 100 connections. Compared to Auth0’s Enterprise tier, that’s an order of magnitude cheaper for startups closing their first few enterprise contracts. AuthKit (the user-management product layered on top of SSO) is free through one million MAUs and ships passwordless, social login, MFA, and a hosted login screen included — you can run your entire consumer-side login on AuthKit for $0 until you hit eight figures of MAU. The MCP authorization piece is where WorkOS gets explicit where others stay quiet: their docs describe AuthKit as spec-compatible with the MCP authorization specification, supporting dynamic client registration (RFC 7591), Client ID Metadata Documents, and OAuth-protected resource metadata for zero-config interop. They also offer Standalone Connect for teams that want to keep an existing login UI and only use AuthKit’s OAuth infrastructure for MCP client authorization.

Pick this if you...

• Sell to mid-market or enterprise customers where SAML and SCIM appear in the procurement checklist
• Want pay-per-SSO-connection economics rather than enterprise-tier seat-based pricing
• Are publishing a remote MCP server and want the IdP layer to be the spec-compatible path of least resistance
• Already use Clerk or Stytch on the consumer side and want WorkOS underneath for the enterprise SSO buyers ask about

Recipe: stand up an MCP authorization server using AuthKit

The shortest path from zero to a working MCP authorization server with WorkOS. Replace the SDK imports with your stack.

# install
npm install @workos-inc/node

# server.ts (Node + Express sketch — MCP authorization endpoints)
import { WorkOS } from '@workos-inc/node';
const workos = new WorkOS(process.env.WORKOS_API_KEY);

// 1. Expose OAuth-protected resource metadata at
//    /.well-known/oauth-protected-resource
//    pointing MCP clients at AuthKit as the authorization server.
app.get('/.well-known/oauth-protected-resource', (req, res) => {
  res.json({
    resource: 'https://your-mcp.example.com',
    authorization_servers: ['https://YOUR_AUTHKIT_DOMAIN'],
  });
});

// 2. Verify access tokens on every MCP request
import { jwtVerify, createRemoteJWKSet } from 'jose';
const JWKS = createRemoteJWKSet(
  new URL('https://YOUR_AUTHKIT_DOMAIN/oauth2/jwks'),
);

async function verifyMcpRequest(token: string) {
  const { payload } = await jwtVerify(token, JWKS, {
    issuer: 'https://YOUR_AUTHKIT_DOMAIN',
    audience: 'your-mcp-resource-identifier',
  });
  return payload;
}

That’s the WorkOS-flavored answer to the canonical MCP authorization sketch from our OAuth 2.1 for MCP deep dive. AuthKit handles the authorization server side — user login, consent screen, token issuance, dynamic client registration — so your MCP server only does two things: publish the metadata document and verify tokens. The MCP client (Cursor, Claude Desktop, etc.) discovers the auth server from the metadata, registers itself dynamically with AuthKit, walks the user through consent, and presents the access token to your MCP server on every call. Setup time is an afternoon, not a sprint.

Skip it if...

You don’t have any enterprise customers and don’t expect to in the next 12 months. WorkOS’s strongest economics are around SSO/SCIM, which most consumer apps and early B2B products don’t need. If your AI app is a consumer mobile experience, Stytch’s passwordless primitives feel more aligned. If it’s a React-shop MVP, Clerk’s component story is faster off the line. WorkOS earns its keep when an enterprise contract is in your pipeline.

Stytch — pick + recipe

What it does best

Stytch’s product premise is “passwords are the problem.” Magic links, OTP codes, passkeys (WebAuthn), biometrics, OAuth, and embeddable login UI are the headline primitives, not bullet points on a feature page. The SDK ergonomics reflect that — the StytchStytchProvider and React hooks are designed around “send a magic link, verify the token,” not “set up password rules, run breach checks.” For consumer mobile apps where passkey conversion is a top metric, Stytch is the cleanest SDK in this comparison. For B2B, Stytch ships a separate B2B SaaS Auth product with Organizations, SSO ($125 per connection beyond the first five free), SCIM, and M2M tokens designed specifically for agent-acting-on-behalf-of-user flows.

Pick this if you...

• Want passwordless as the headline UX, not a sign-up checkbox
• Are building a consumer mobile app where passkey conversion is a KPI
• Need M2M tokens for service-to-service auth in addition to user-facing flows (Stytch ships both in one SDK)
• Have a B2B SaaS where the consumer-side polish matters but enterprise SSO is also on the roadmap

Recipe: magic-link login in Next.js with passkey upgrade

Send a magic link, log the user in on click-through, then offer them a one-tap passkey upgrade on subsequent visits.

# install
npm install stytch

# app/api/auth/send-magic-link/route.ts
import * as stytch from 'stytch';
const client = new stytch.Client({
  project_id: process.env.STYTCH_PROJECT_ID!,
  secret: process.env.STYTCH_SECRET!,
});

export async function POST(req: Request) {
  const { email } = await req.json();
  await client.magicLinks.email.loginOrCreate({
    email,
    login_magic_link_url: 'https://yourapp.com/auth/callback',
    signup_magic_link_url: 'https://yourapp.com/auth/callback',
  });
  return Response.json({ ok: true });
}

# app/auth/callback/route.ts — verify the token, set session
export async function GET(req: Request) {
  const token = new URL(req.url).searchParams.get('token')!;
  const { user, session_token } = await client.magicLinks.authenticate({ token });
  // ... set httpOnly cookie with session_token, redirect to dashboard
}

Once the user is in, prompt them to register a passkey on the next sign-in to avoid the magic-link round-trip. Stytch’s WebAuthn SDK handles the platform-specific WebAuthn ceremony; from the user’s perspective it’s a single Face ID tap and they’re in. The same Stytch project supports magic-link, OTP, passkey, and OAuth as parallel paths, and you can light up each one independently.

Skip it if...

Your team doesn’t want to build the login UI — Stytch is more SDK-first than component-first compared to Clerk. Hosted login is available but the customization is less polished. If you want to drop in<SignIn /> and move on with your life, Clerk is faster. If your headline ask is enterprise SSO economics rather than passwordless flows, WorkOS is the better-aligned choice.

Descope — pick + recipe

What it does best

Descope’s differentiator is the flow builder. Every other provider in this comparison treats auth as code; Descope treats it as a visual graph. Drag a “send magic link” node onto the canvas, connect it to a “verify magic link” node, branch on “is this a new user” into a “collect profile fields” node, end with “create session.” The flow is a JSON document the SDK consumes — you can version it, A/B test it, and hand it to a non-developer PM or designer to tweak without shipping code. For teams that iterate on the auth funnel as a product surface, the visual model is genuinely fast.

Pick this if you...

• Iterate on the auth funnel as a product surface and want a PM or designer to be able to tweak it without an engineer
• Need to A/B test login flows or roll out progressive profiling without a release
• Want a unified canvas for passwordless, OAuth, MFA, and custom branching logic
• Are evaluating the newer entrants and willing to bet on a smaller community in exchange for the flow-builder primitive

Recipe: a sign-in flow with magic link, passkey upgrade, and MFA fallback

With Descope, the “recipe” is mostly in the visual flow editor. The code is thin glue.

# 1. Design the flow in Descope's visual editor:
#    Magic link  -> Verify token  -> Is passkey enrolled?
#                                    | yes -> create session
#                                    | no  -> offer passkey enrollment
#                                            -> create session
#    On any failure: fall back to TOTP MFA, then create session.
#    Publish the flow with id "sign-in-v3".

# 2. Embed the flow in Next.js
npm install @descope/react-sdk

# app/login/page.tsx
'use client';
import { Descope } from '@descope/react-sdk';

export default function Login() {
  return (
    <Descope
      flowId="sign-in-v3"
      onSuccess={(e) => { window.location.href = '/dashboard'; }}
      onError={(err) => console.error(err)}
    />
  );
}

Subsequent changes to the sign-in funnel happen in the flow editor, not in your codebase. Add a step, change a branch, tweak the order of MFA fallbacks — ship to production without a deploy. The cost is a learning curve outside the flow editor (the SDK assumes you’re composing flows rather than calling primitive endpoints) and a smaller community than Auth0 or Clerk to ask questions in.

Skip it if...

Your team doesn’t iterate on auth flows often enough to justify the abstraction. If “magic link, social, done” is your entire sign-in story for the foreseeable future, the flow builder is overhead you don’t need. Clerk or Stytch ship that experience in fewer concepts. Also skip if you’re an enterprise procurement shop — Descope doesn’t have Okta’s tenure and your security team will ask more questions.

MCP OAuth + auth providers: deep dive

The MCP authorization specification, finalized over 2025 and in production use throughout 2026, makes OAuth 2.1 the non-negotiable wire protocol between MCP clients and remote MCP servers. The implications for the five providers in this comparison are different enough to warrant their own section.

The shape of the problem. A remote MCP server (streamable-HTTP transport) needs to authorize each request. The MCP authorization spec resolves this by saying: your MCP server publishes an OAuth-protected resource metadata document at /.well-known/oauth-protected-resource pointing to an authorization server, the client (Cursor, Claude Desktop, etc.) reads that metadata, registers itself with the auth server via dynamic client registration (RFC 7591), walks the user through OAuth 2.1 with PKCE, and presents the resulting access token to the MCP server on every call. The MCP server verifies the token (typically a JWT, against the authorization server’s JWKS endpoint) and authorizes the request based on the embedded scopes.

What each provider does about it.

WorkOS AuthKit is the most explicit. Their documentation describes AuthKit as a spec-compatible authorization server for MCP, with dynamic client registration, Client ID Metadata Documents, OAuth-protected resource metadata, and PKCE all wired up. Standalone Connect allows teams with existing login UI to keep that UI while delegating MCP client authorization to AuthKit. The setup story is the shortest in the comparison.

Auth0 supports every primitive (OAuth 2.1 flows, dynamic client registration, PKCE, JWKS) but you assemble the MCP-specific pieces yourself. Most teams write an Auth0 Action that maps incoming MCP-shaped client registrations to the right tenant and writes the resource-server identifier into the access token audience claim. Auth0’s own MCP server (@auth0/auth0-mcp-server) is a different thing — it’s for managing your Auth0 tenant from an agent, not for protecting MCP servers with Auth0 as the IdP. Both can coexist.

Clerk supports OAuth 2.1 in its hosted plans and exposes JWKS at a discoverable endpoint. Dynamic client registration is supported on certain plan tiers. Dedicated MCP documentation is thinner than WorkOS’s as of mid- 2026; expect Clerk to publish more here as the protocol matures.

Stytch handles OAuth 2.1, M2M tokens, and JWKS-based token verification. Their M2M product was explicitly designed for service-to-service flows and adapts cleanly to agent-acting-on-behalf-of-user when paired with user-side OAuth. Stytch hasn’t marketed MCP authorization as a distinct product line at the time of writing, but the primitives are there.

Descope ships OIDC and OAuth 2.1 in the underlying SDK; the flow builder can model the consent step visually, which is one of the few cases where the visual metaphor makes the MCP path easier rather than harder to think about.

Recommendation for 2026 MCP server authors. If you’re publishing a remote MCP server today and want the shortest path from zero to a working OAuth flow, WorkOS AuthKit is the easiest answer because the docs match the spec exactly. If you already use Auth0 and don’t want a second vendor, Auth0 works fine, you just write more glue. If you use Clerk, Stytch, or Descope for the main app, check the latest docs — this is the area moving fastest and the gap was narrowing every quarter in 2025.

Pricing shape

Listed prices as of May 2026, pulled directly from each vendor’s pricing page. The shape matters more than the exact numbers because every provider changes list pricing periodically.

Read the shape, not the number. Clerk and Stytch optimize for early-stage MAU growth (large free tier, predictable bucket pricing). WorkOS optimizes for B2B AI selling SSO to enterprises (free AuthKit, pay-per-connection). Auth0 optimizes for enterprise procurement (high list price, predictable feature set, negotiable). Descope sits in the Pro-tier price band where the flow builder is the differentiator. Always confirm at source before purchase: auth0.com/pricing, clerk.com/pricing, workos.com/pricing, stytch.com/pricing, descope.com/pricing.

Common pitfalls

Community signal

The auth-provider category has a longer paper trail than the MCP category — Auth0 has been shipping since 2013, Clerk since 2019, WorkOS since 2019, Stytch since 2020, Descope since 2022. That history means a lot of verifiable signal, but also a lot of dated comparisons. We’re only reporting consistent themes from 2024-2026 vendor blogs, official customer stories, and GitHub discussion threads; we’re not fabricating quotes.

Consistent themes across the community in the lead-up to 2026: Clerk and WorkOS are the rising pair for new AI startups — Clerk for the consumer-side polish and time-to-ship, WorkOS for the enterprise SSO buyers ask about. Many teams run both. Auth0 remains the default for companies that already have an Okta relationship or are selling to industries with established Okta procurement. Stytch is the quietly strong pick for consumer mobile apps that take passwordless seriously; the SDK ergonomics are the consistent praise point. Descope is the “watch this space” pick — the flow builder is genuinely novel, and the question is whether the community grows to match.

On the MCP authorization angle specifically: WorkOS publishing first-class MCP authorization documentation in 2025 made them the obvious choice for new MCP server authors. Whether that holds depends on whether Clerk, Stytch, and Descope publish equivalent docs over 2026 — the primitives are there in all three, the docs aren’t yet. Auth0 has the depth but requires more assembly. Pick the one whose docs match your team’s assembly tolerance.

Frequently asked questions

Sources

Auth0

• auth0.com/pricing — B2C Essentials/Pro, B2B Essentials/Pro, Enterprise
• github.com/auth0/auth0-mcp-server — official Auth0 MCP, tenant management
• auth0.com/docs — Actions, Organizations, FGA, Universal Login

Clerk

• clerk.com/pricing — Hobby/Pro/Business/Enterprise tiers
• clerk.com/docs — Next.js middleware, components, Organizations
• github.com/clerk/javascript — agent-toolkit and SDKs

WorkOS

• workos.com/pricing — AuthKit free tier, per-connection SSO/SCIM
• workos.com/docs/authkit/mcp — MCP authorization, DCR, Standalone Connect
• workos.com/docs — SSO, Directory Sync, AuthKit

Stytch

• stytch.com/pricing — pay-as-you-go free tier, SSO/SCIM connections
• stytch.com/docs — magic links, passkeys, M2M tokens, B2B

Descope

• descope.com/pricing — Free/Pro/Growth/Enterprise tiers
• docs.descope.com — flow builder, SDKs, OIDC

Related comparisons

• /blog/oauth-21-for-remote-mcp-servers-streamable-http-explained-2026 — wire-level OAuth 2.1 for remote MCP servers
• /blog/mcp-security-200000-exposed-servers-owasp-mcp-top-10-cves — MCP threat model, OWASP MCP Top 10
• /blog/meta-ads-vs-google-ads-vs-tiktok-ads-mcp-2026 — ads-MCP comparison (companion piece)

Internal links

• /servers/auth0
• /servers/clerk
• /servers/stytch
• /best-mcp-servers — curated roundup
• /servers — browse all