00/kavachOS vs Clerk
Clerk's sign-in card is the benchmark for drop-in React auth. It also stops at human sessions. kavachOS keeps the sign-in flow and adds the primitives agents need: scoped tokens, delegation, M2M, MCP OAuth 2.1. You trade some UI polish for a longer runway.
01/Why people land on this page
Clerk is built for logged-in humans. That is a feature, not a flaw. It becomes a problem the day you ship an agent, the day your customer's IT team asks about data residency, or the day your B2B invite flow multiplies by your customer count.
B2B org billing compounds with customer growth
Clerk Pro charges $1 per organization member per month on top of the MAU fee. A product with 50 customers averaging 20 seats each is paying an extra $1,000 a month before anything else. kavachOS charges per MAU and leaves org membership flat.
No machine-to-machine token support
Clerk has no M2M token primitive. If a service calls another service, or an agent calls a tool, you end up using long-lived API keys with no delegation metadata and no revocation by scope. kavachOS ships OAuth 2.0 client credentials as a first-class flow.
Cloud only, no self-host
Healthcare, fintech, and any buyer with a VPC requirement will ask. Clerk does not self-host. kavachOS is MIT and runs on Node, Bun, Deno, and Cloudflare Workers, so the answer is not a block on the deal.
02/Where they beat us
If any of these matter more than the reasons above, stay on Clerk. The migration will still be here when the trade-off flips.
Clerk is better at
Clerk's SignIn, SignUp, UserButton, and OrganizationSwitcher are polished to a level most teams will not match on their own. They handle loading states, error states, passkeys, and social in one drop. kavachOS ships headless primitives and shadcn-compatible components. Functional parity, not visual parity on day one.
Clerk is better at
Clerk's dashboard has had two more years of product polish. Impersonation, session inspection, and webhook testing tools are noticeably more developed. kavachOS has the same features in the primary workflow, but the edges are newer.
Clerk is better at
Clerk's magic link and OTP user experience is dialed in. Redirect handling across devices, code-copy-paste fallback, and rate-limit messages are all thought through. kavachOS covers the same surface area, but you may notice rougher edges in the first month of use.
03/Side by side
No checkmark theater. Each row is a value you can verify against the public docs on either side.
Row
kavachOS
Clerk
Starting price
Clerk free tier excludes organization features and SSO.
Org member fee
Runs alongside the per-MAU charge.
Open source license
Self-host option
Machine-to-machine tokens
Agent identity primitive
MCP OAuth 2.1 server
Enterprise SSO (SAML / OIDC)
SCIM provisioning
Prebuilt React components
Cloudflare Workers runtime
04/Pricing
Everyone argues about pricing in the abstract. Pick the MAU count that matches next quarter and compare the two columns. Ignore the rest.
Clerk
Free up to 10,000 MAU. Pro adds per-MAU and per-member charges. Enterprise SSO and SCIM are gated to higher tiers.
Free
10,000 MAU
No organizations, no SSO, no custom domains.
$0
Pro
10,000 MAU
+$0.02 per extra MAU, +$1 per org member.
$25 / mo base
Enterprise
SCIM, advanced SSO, dedicated support.
Custom
kavachOS
Flat monthly. No per-member fee. Agent identity, M2M, and SSO are included where you'd expect them.
Free
1,000 MAU
Full features, no credit card.
$0
Starter
10,000 MAU
Agent identity and M2M included.
$29 / mo
Growth
50,000 MAU
SSO, SCIM, priority support.
$79 / mo
Scale
200,000 MAU
SLA, dedicated support.
$199 / mo
Enterprise
Self-host assist, custom terms.
Custom
05/Migration
Before · Next.js with Clerk
// middleware.ts
import { clerkMiddleware } from "@clerk/nextjs/server";
export default clerkMiddleware();
// app/page.tsx
import { auth, currentUser } from "@clerk/nextjs/server";
export default async function Page() {
const { userId } = await auth();
if (!userId) return <SignIn />;
const user = await currentUser();
return <p>Hi {user?.firstName}</p>;
}After · Next.js with kavachOS
// middleware.ts
import { kavachosMiddleware } from "kavachos/next";
export default kavachosMiddleware();
// app/page.tsx
import { auth, currentUser } from "kavachos/next";
export default async function Page() {
const { userId } = await auth();
if (!userId) return <SignIn />;
const user = await currentUser();
return <p>Hi {user?.firstName}</p>;
}Export
Swap
Components
Org billing
Webhooks
06/Decide in thirty seconds
Stay on Clerk
Switch to kavachOS
07/FAQ
Short answers. Link to the docs if the long version matters.
Ship the agent primitive now. Keep the Clerk-shaped DX.
kavachos/next reads like clerkMiddleware because we wrote the helpers to match. Install the library, import the compat components, and get the M2M and agent pieces you needed. If you want to stay on Clerk for the UI, stay. The migration waits.