Best auth provider
for vibe-coded apps
Updated 2026-09-18. Clerk is the pick for most projects. Here is how the options compare, and how to run whichever you choose through a single Squiid key.
Short answer
- Our pick: Clerk. Drop-in components give you sign-in, sign-up, profile and organisation management in an afternoon, and the React and Next.js integrations are the ones agents already know.
- Runner-up: WorkOS. The right answer when your users are companies: SAML single sign-on, directory sync and audit logs without building an enterprise checklist yourself.
- Pick something else when: Auth0 when you need deep customisation, legacy protocol support or you are inheriting an existing tenant, Stytch when you want passwordless and device-based flows as the primary experience, and your database vendor auth, for example Supabase Auth, when you are already on that platform and want one fewer service.
Authentication is where vibe-coded apps most often go wrong, because it looks simple and is not. Use Clerk. You get hosted sign-in, session handling, organisations and a user list on day one, and you do not write password hashing, email verification or session rotation yourself.
How to choose a auth provider for an AI-coded app
Never let an agent hand-roll auth
Password storage, session invalidation, email verification, rate limiting on sign-in and token rotation are all easy to get subtly wrong, and a subtle mistake here is a breach rather than a bug. Use a provider even for a side project. This is the one category where rolling your own is a bad idea at any scale.
Consumer users or company users?
Consumer apps need social login, magic links and maybe passkeys. B2B apps need organisations, invitations, roles and eventually SAML. Picking a consumer-shaped provider and later needing enterprise single sign-on is a rewrite, so answer this question first.
Where does the session live?
Check whether the provider issues a JWT you verify yourself or a session you validate with an API call, and confirm it works with your hosting model. Edge and serverless runtimes limit which crypto libraries are available, and that limits which verification approach you can use.
How are users linked to your own data?
You will need a users table of your own keyed by the provider user id, plus a webhook that keeps it in sync on create, update and delete. Confirm those webhooks exist before you commit, because reconciling later is tedious.
Pricing at the monthly active user cliff
Auth providers are free until a threshold of monthly active users, then charge per user, sometimes with a large step up for features like single sign-on. Find that cliff for your expected growth before you build the integration.
Compare the options
Every auth provider option Squiid carries in the Auth category, with what each one is best at and how it bills.
| Service | Best for | Pricing | On Squiid |
|---|---|---|---|
| Auth0 | Identity platform with enterprise SSO, rules and fine-grained control | Essentials $35/mo, both | Roadmap |
| Clerk | Drop-in authentication with prebuilt components and organizations | Pro $25/mo, both | Live |
| Stytch | Passwordless auth, fraud prevention and device fingerprinting | both | Roadmap |
| WorkOS | Enterprise-ready auth: SSO, SCIM directory sync and audit logs | both | Roadmap |
Why run your auth provider through Squiid
One login instead of one per vendor. Squiid carries 4 auth provider options here and every other layer of the stack beside it. You create one account, click the service you want, and Squiid provisions it upstream. No separate signup, no separate password, no second dashboard.
One bill, at the provider's price. Usage is paid from prepaid Squiid credits at par: $1 of credit is $1 at the provider, with no markup on what the provider charges. The free plan is $0/month with a 15% fee on credit top-ups and a $50 minimum top-up. Solo is $19.97/month and its top-up fee starts at 8%, falling to 6.5%, 5% and 3.5% as trailing 30-day API spend passes $100, $500 and $2,000. Team is $29.97 per seat per month for seats 1-5, $24.97 for seats 6-20 and $19.97 above that, with the same ladder one point lower. Custom pricing is 3% or less against a commitment. Services that are sold as a monthly subscription, such as Clerk's paid plan, pass through on your Squiid invoice at the provider's own price with no fee on top.
Squiid holds the upstream key. The provider credential lives in Squiid, not in your repo, not in a chat window and not in a screenshot. Your project gets one variable, SQUIID_API_KEY, and that is the only secret an agent ever needs to see. Rotating it is one click and does not touch the provider.
It works with every coding agent. Point the SDK base URL at https://api.squiid.io/v1/<service>/ and send Authorization: Bearer $SQUIID_API_KEY. Claude Code, Cursor, Codex, Gemini CLI, Copilot, Windsurf, Cline, Devin, Replit, v0 and Lovable all read environment variables the normal way. See the gateway convention.
Running out pauses, it never deletes. Squiid warns you at 75%, 90% and 100% of your balance. At zero, calls pause instead of overdrawing, and your data stays where it is. Auto top-up is optional and takes a hard monthly cap. See spend controls.
Set it up in 3 steps
Add Clerk in the dashboard
Create a Squiid account, open the catalogue, and click add on Clerk. Squiid creates the upstream account or project for you and holds the credential.
Put one variable in .env
Copy your Squiid key and add SQUIID_API_KEY=sq_live_… to your project's .env. Delete any provider keys you were carrying. Nothing else changes.
Point your agent at the gateway
Tell your agent that calls go to https://api.squiid.io/v1/clerk/ with Authorization: Bearer $SQUIID_API_KEY. Most SDKs take a base URL option, so it is a one-line change.
In practice that is one line in your project:
SQUIID_API_KEY=sq_live_xxxxxxxxxxxxxxxxxxxxThen every call your app or your agent makes goes to the gateway with that one key:
curl https://api.squiid.io/v1/clerk/... \
-H "Authorization: Bearer $SQUIID_API_KEY"Questions people ask
What is the easiest way to add login to an app I vibe-coded?
Clerk. Install the SDK, drop in the sign-in component, wrap your app in the provider, and you have working authentication with sessions and a user dashboard. Add it through Squiid so the secret key stays in Squiid rather than in your repo or your agent prompt.
Clerk or Auth0?
Clerk for new consumer or small team apps where you want prebuilt UI and fast setup. Auth0 when you need unusual protocols, heavy customisation of the login flow, or you already have an Auth0 tenant. WorkOS instead of both when enterprise single sign-on is the requirement.
Should I just use Supabase Auth?
If your data is already in Supabase, yes, it is one fewer service and your row level security policies can reference the authenticated user directly. Move to a dedicated provider when you need organisations, invitations or single sign-on.
Can I let an AI agent build my login flow safely?
Yes, as long as the agent is wiring up a provider rather than implementing credentials itself. Give it SQUIID_API_KEY and the gateway path, review the session handling, and never let it write its own password hashing or token signing.
What happens to signed-in users if my Squiid credits run out?
Existing sessions are not deleted, but calls that hit the provider through the gateway pause at a zero balance. You get alerts at 75%, 90% and 100%, and auto top-up with a monthly cap keeps a live app from pausing unexpectedly.
One key for your auth provider.
And everything else.
Add Clerk and 107 other services to one account, one key, one bill and one dashboard.