Your users migrated to Clerk with no lockouts and no password resets
Move off Firebase, Auth0, or NextAuth without a bad morning.
The scary part of changing auth providers is not the code. It is the morning after, when a few hundred customers try to log in and cannot.
I move apps onto Clerk without that morning. Your users come across with their existing passwords intact, the old provider stays live until the new one is proven, and there is a written rollback path the whole time. If something looks wrong at any point, we go back and nobody outside the team notices.
I have run this on production SaaS apps, and I treat the user table as the thing that must not break, because it is.
What you get
- ✓A full inventory of where your current auth touches your code, including the places it is checked and the places it is only assumed
- ✓Your users imported into Clerk with their password hashes, so they keep the password they already use
- ✓Social and SSO identities relinked, so a Google sign-in still resolves to the same account and not a duplicate
- ✓Your user IDs mapped, so existing rows in your database still point at the right person after the move
- ✓Sign-in, sign-up, session handling, and route protection rebuilt on Clerk
- ✓A cutover plan with a rollback path, run at a time you choose
- ✓Post-cutover watch, with sign-in success rates checked against your before numbers
How it works
- 1You share repo and provider access. I audit what you have and how many users.
- 2I run a test import into a Clerk development instance, using a copy of your real user data.
- 3I rebuild the auth flows on a branch and you sign in on a preview deployment.
- 4We pick a cutover window. I run the production import, flip it, and watch.
- 5The old provider stays untouched for a rollback window before you cancel it.
Pricing
Fixed price, fixed delivery date. Not sure which tier fits? Book a scoping call and we’ll figure it out together.
Migration audit and plan
- ✓Audit of every place your current auth is used, delivered as a written map of your codebase
- ✓Export test against your real provider, confirming whether your password hashes can move
- ✓Proof of concept: a sample of your users imported into a Clerk development instance and signing in
- ✓Written cutover plan, including rollback steps and the risks specific to your setup
- ✓A fixed price quote for the full migration, with the audit fee credited if you continue
Deciding whether to move at all, or getting a real number to take to your team.
Full migration
- ✓Everything in the audit tier
- ✓Up to 10,000 users imported with password hashes preserved
- ✓One source provider, plus social identities relinked
- ✓User ID mapping, so your existing database rows stay attached to the right accounts
- ✓Auth flows rebuilt on Clerk: sign-in, sign-up, profile, session validation, protected pages and API routes
- ✓Webhooks keeping Clerk and your database in sync going forward
- ✓Production cutover run in a window you pick, with rollback ready
- ✓Seven days of post-cutover monitoring and fixes
A live app on Firebase, NextAuth, Supabase Auth, or a custom setup that needs to move without drama.
Complex or multi-tenant migration
- ✓Everything in Standard, with no user count cap
- ✓Teams and tenants mapped onto Clerk Organizations, with membership and roles carried across
- ✓Custom claims, permissions, and metadata ported and enforced server side
- ✓Multiple source providers, or one provider plus a legacy table
- ✓Enterprise SSO connections rebuilt for your existing SAML customers
- ✓Staged cutover: a pilot group moves first, the rest follow once the numbers hold
- ✓Thirty days of post-cutover support
B2B SaaS with organizations, enterprise customers on SSO, or more than one auth system in play.
Add-ons
- +Users beyond 10,000 on the Standard tier: +$250 per additional 25,000
- +Additional source provider: +$600
- +Weekend or overnight cutover window: +$400
- +Stripe customers relinked to migrated Clerk users or organizations: +$650
- +Extra 30 days of support after the included window: +$450
Questions
Will my users have to reset their passwords?
In most cases no. Clerk accepts imported password hashes, so the password your user already knows keeps working. Firebase, Supabase Auth, and custom bcrypt tables export cleanly. Auth0 requires a support request to release your hashes, which takes them a few business days, so start that early. If a source will not release hashes at all, the fallback is a one time reset link, and I write the email that goes with it.
Will there be downtime?
No user facing downtime in a normal migration. The import runs against a live copy, the code switch ships as a deploy, and the old provider stays reachable for rollback. The one visible effect is that active sessions end at cutover, so users sign in once more than usual.
What happens to two factor enrollments?
Plan on users re-enrolling. Most providers will not export TOTP secrets. I set up the re-enrollment prompt so it lands the first time each user signs in, rather than blocking them at the door.
Can we roll back?
Yes, and it is part of the plan rather than an afterthought. Your old provider is not deleted or downgraded until you say so, and the code change reverts with one deploy.
How do I know it worked?
I record your sign-in success rate before the move and check it against the same measure after. You get the numbers, not just an assurance.
Can you just set up Clerk on a new app instead?
Yes, that is the other fixed-price offer, priced lower since there is nothing to migrate.
Ready to scope it out?
A short call to confirm which tier fits and lock in a delivery date. No obligation.