Moving from Supabase Auth to Clerk
A cost comparison and planning checklist. These are assessment steps, not vendor-specific migration instructions.
Supabase Auth
Authentication bundled with a PostgreSQL backend.
$0 / month
Free · auth allowance
Official pricing · Checked 2026-10-05
Cost breakdown and exclusions
- Monthly subscription: $0
- Assumes auth data and traffic stay within Free database and egress allowances. Inactive free projects can pause.
- SMS, enterprise SSO, directory synchronization, custom domains, custom email delivery and optional security add-ons.
- SMTP delivery and usage beyond bundled database, storage and transfer allowances.
Clerk
Authentication priced by users who return after signup day.
$0 / month
Hobby
Official pricing · Checked 2026-10-05
Cost breakdown and exclusions
- Monthly subscription: $0
- Retained users return at least 24 hours after signup. Hobby has feature and dashboard-seat limits.
- SMS, enterprise SSO, directory synchronization, custom domains, custom email delivery and optional security add-ons.
Recurring cost difference
The modeled recurring costs are equal.
Not calculated. Estimate migration labor, overlapping subscriptions, transfer charges and contract obligations before dividing those costs by any monthly savings.
Holding other usage fields fixed, Supabase Auth becomes the lower-cost option near 83,334 users / month. This is a modeled price transition, not a migration payback calculation.
What this comparison covers
Consumer email/social authentication for one application. No SMS, enterprise SSO, directory sync, custom email delivery or advanced security add-ons. Clerk bills retained users, not all active users. Enter that ratio explicitly.
Evaluating 2 products from 4 published in this category. USD monthly equivalents, before tax. Features and service compatibility need separate evaluation.
- Monthly active users
- 10,000 users / month
- Returning after the first day
- 60 % of active users
Before you move
- This is a readiness assessment, not a verified vendor migration procedure.
- Use the source pricing and plan documentation: https://supabase.com/pricing
- Use the target pricing and plan documentation: https://clerk.com/pricing
- Obtain the account permissions, data-owner approvals and tested backups needed for your chosen transfer method.
Modeled recurring cost
Supabase Auth: $0/month
Clerk: $0/month
Supabase Auth and Clerk have the same modeled cost of $0 per month at this workload.
Requirements
Free · auth allowance
Hobby
Check whether identities, password hashes, sessions, organization memberships and sign-in methods can be transferred; do not assume existing sessions survive.
Your migration readiness checklist
Check items as you review them. Progress is kept only while this page is open.
Questions before you decide
Does a lower monthly estimate mean the migration pays for itself?
Not calculated. Estimate migration labor, overlapping subscriptions, transfer charges and contract obligations before dividing those costs by any monthly savings.
Is this a guaranteed migration procedure?
No. This assessment identifies decisions to verify with official provider documentation. It does not establish interoperability, data portability, zero downtime or a rollback guarantee.