COMPARE / AUTHENTICATION

Authentication, with the math.

Model the cost of active users and returning users without confusing the two.

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.

YOUR COMPARISON, YOUR CALL

Bring your shortlist.

2 / 4 selected

Choose up to four products for a closer look. The full cost ranking stays below.

Showing 4 of 4 supported products. Find products for this comparison

Your workload

Monthly usage. Adjust the assumptions to match your product.

Monthly active users

users / month

Distinct users who authenticate or perform a billable activity during the month.

Returning after the first day

% of active users

Clerk retained-user estimate. Percentage returning more than 24 hours after signup. Other providers use active users.

Estimates are in USD before taxes. Your usage stays in this URL.

Capabilities:

Decision guideOne shared workload. Different trade-offs.	Supabase Auth Plan for Supabase Auth	Clerk Plan for Clerk
Monthly equivalentUSD · before tax	$0Lowest in your shortlistFree · auth allowance	$0Lowest in your shortlistHobby
Payment commitment	Monthly	Monthly
Fits this workload?	Within modeled limits	Within modeled limits
What to know	Assumes auth data and traffic stay within Free database and egress allowances. Inactive free projects can pause.	Retained users return at least 24 hours after signup. Hobby has feature and dashboard-seat limits.
Outside the estimate	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.	SMS, enterprise SSO, directory synchronization, custom domains, custom email delivery and optional security add-ons.
Evidence	Official pricing ↗Checked 2026-10-05	Official pricing ↗Checked 2026-10-05

Look ahead, before you commit.

Vary monthly active users. Keep all other inputs fixed.

Sampled growth costs

ClerkSupabase Auth

View exact values and assumptions

Each point follows your selected plan. Automatic choices use the lowest eligible supported plan per product. Missing values mean no supported plan fits. This varies one input, not all costs with customer count. Lines connect sampled estimates; prices between those points can change in steps or at plan limits.

Monthly active users	Clerk	Supabase Auth
1,000 users / month	$0	$0
1,001 users / month	$0	$0
4,500 users / month	$0	$0
8,000 users / month	$0	$0
10,000 users / month	$0	$0
11,500 users / month	$0	$0
15,000 users / month	$0	$0
18,500 users / month	$0	$0
22,000 users / month	$0	$0
25,500 users / month	$0	$0
32,500 users / month	$0	$0
36,000 users / month	$0	$0
39,500 users / month	$0	$0
43,000 users / month	$0	$0
46,500 users / month	$0	$0
50,000 users / month	$0	$0
50,001 users / month	$0	Not available
53,500 users / month	$0	Not available
60,500 users / month	$0	Not available
64,000 users / month	$0	Not available
67,500 users / month	$0	Not available
71,000 users / month	$0	Not available
74,500 users / month	$0	Not available
78,000 users / month	$0	Not available
81,500 users / month	$0	Not available
83,334 users / month	Not available	Not available
88,500 users / month	Not available	Not available
92,000 users / month	Not available	Not available
95,500 users / month	Not available	Not available
99,000 users / month	Not available	Not available
102,500 users / month	Not available	Not available
106,000 users / month	Not available	Not available
109,500 users / month	Not available	Not available
113,000 users / month	Not available	Not available
120,000 users / month	Not available	Not available