For developers
Ship the side project. Skip building sign-in.
Hosted login with social logins, email codes and passwords, one SDK for your browser app, API and CLI, and a real test environment. Free while your project finds its users.
The problem
Sign-in is the part nobody wants to build twice
Rolling your own means password resets, email verification, rate limits and token refresh before your app does anything at all.
The big providers are built for enterprises: a sprawling console, and a bill that jumps the moment you grow.
Test users end up in production, because there was only ever one environment.
How Anchr.ing helps
Everything sign-in needs, in an afternoon
Every way to sign in
Passwords, email codes and magic links, Google, GitHub, Apple and more. Passkeys and two-step verification come with Startup, and work in test on every plan.
A real test environment
Its own users, keys and apps, with mail kept in a log instead of sent. Promote to production in one step.
One SDK everywhere
Sign in from browsers and CLIs, verify tokens offline in your API. No call per request.
Set up by your coding agent
The MCP server, llms.txt and rule files for Claude Code, Cursor and Copilot get the integration right the first time.
One token
Every check reads the same token
When a user signs in, their token carries who they are, their organisation and role, their plan and payment status, and what your flags target. Your API checks it in one guard, offline, and your UI reads the same answers.
Identitywho signed in, and how
sub · amrRolesthe organisation and what it allows
org.roleBillingthe plan and its payment status
billing.planFlagswhat is switched on for this user
flag()In your code
A signed-in user in a few lines
React, Vue, Angular or no framework at all. Your API verifies the same token offline.
import { createAuth } from '@anchring/auth/browser';
export const auth = createAuth({ project: 'acme', env: 'test', clientId: 'test_…' });
await auth.ready(); // finishes the callback, restores the session
if (!auth.user()) await auth.signIn(); // hosted login: passkey, password or email code
const res = await auth.fetch('/api/notes'); // adds the token, refreshes it firstThe plan
Free in numbers
Prices in euros, excluding VAT. Test environments include every feature on every plan.
a month, free for good, no card
monthly active users
sign-in apps; APIs and backend services are free
Questions
Before you start
Is the free plan really free?
Yes: no card, no time limit. You pay when you need more users or apps than it includes, or a paid feature in production.
What counts as an app?
Only the apps your users sign in to: web, single-page, mobile, desktop and command-line apps. APIs and backend services are free.
Do I have to use your SDK?
No. Your sign-in is a standard OpenID Connect provider, so any OIDC library works. The SDK just makes it shorter.
Build it all in test, for free
Every feature works in your test environment on the free plan. No card needed.
Free to start. No card needed.
Who it's for
Anchr.ing at every stage
For startups
The Startup plan
For B2B SaaS
The Team plan
For agencies
The Team plan
For scale-ups
The Scale plan
For enterprise
The Enterprise plan
Sovereign and public sector
The Sovereign plan
Compare all plans
Every plan side by side, and the questions people ask before paying.