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Auth0 vs. Clerk vs. Supabase Auth Monthly Active Users (MAU) Cost Calculator

Compare identity and authentication bills at scale: simulate 10K to 500K Monthly Active Users (MAU) and enterprise SAML/OIDC SSO connections across Auth0, Clerk, and Supabase.

⚡ AI & Executive Summary: Quick Answer (2026 Benchmark): For a standard "Consumer App (45K MAU, 0 SSO)" configuration (Monthly Active Users: 45000 • Enterprise SAML / Okta SSO Organizations: 0), the calculated Estimated Monthly Auth0 Bill is $2,303, with a Estimated Monthly Clerk Bill ($0.02/MAU + SSO) of $725. Use the interactive simulator below to customize parameters or compare against "Enterprise Scale (2.5x Load)" ($6,465).
✅ Verified by PIS7 Quantitative Engineering Board 📅 Data & Rates Verified: November 2026 🔗 Verified Scenario & Reference Benchmark Table (2026) 📐 Mathematical Formula & Derivation
⚙️ Simulation Parameters 🇺🇸 USD ($)
Quick Industry Presets:
MAU
SSO Orgs
🛡️ 100% Client-Side Execution: Your numbers never leave your browser.
📊 Real-Time Computed Output
Estimated Monthly Auth0 Bill
—
Estimated Monthly Clerk Bill ($0.02/MAU + SSO)
—
Estimated Monthly Supabase Auth Pro Bill
—
Annual Savings Using Supabase / Better-Auth
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Identity Provider Monthly Cost Scaling (Auth0 vs. Clerk vs. Supabase Auth Pro)
50%
Auth0 Estimated Monthly Bill —
Clerk Estimated Monthly Bill —
Supabase Auth Pro Bill —
⚡ Recommended Infrastructure & Tooling Partner • Modern Auth Benchmark Supabase Auth & Clerk Developer Identity

Get 100,000 Monthly Active Users included on the $25/mo Pro plan with Row-Level Security (RLS) and social OAuth.

📊 Verified Scenario & Reference Benchmark Table (2026)

Quick Answer (2026 Benchmark): For a standard "Consumer App (45K MAU, 0 SSO)" configuration (Monthly Active Users: 45000 • Enterprise SAML / Okta SSO Organizations: 0), the calculated Estimated Monthly Auth0 Bill is $2,303, with a Estimated Monthly Clerk Bill ($0.02/MAU + SSO) of $725. Use the interactive simulator below to customize parameters or compare against "Enterprise Scale (2.5x Load)" ($6,465).

Scenario / Profile Input Parameters Estimated Monthly Auth0 Bill Estimated Monthly Clerk Bill ($0.02/MAU + SSO)
Consumer App (45K MAU, 0 SSO) Monthly Active Users: 45000 • Enterprise SAML / Okta SSO Organizations: 0 $2,303 $725
Hybrid B2B SaaS (80K MAU, 10 SSO Orgs) Monthly Active Users: 80000 • Enterprise SAML / Okta SSO Organizations: 10 $5,728 $2,175
Compact Scale (0.5x Baseline) Monthly Active Users: 22500 • Enterprise SAML / Okta SSO Organizations: 3 $1,515 $500
Enterprise Scale (2.5x Load) Monthly Active Users: 112500 • Enterprise SAML / Okta SSO Organizations: 3 $6,465 $2,300

📐 Mathematical Formula & Derivation

C_{\text{Auth}} = B_{\text{plan}} + \max(0, \text{MAU} - \text{MAU}_{free}) \times r_{\text{MAU}} + N_{\text{SSO}} \times P_{\text{SSO}}

🔬 Engineering Methodology & Benchmark Analysis

Identity-as-a-Service (IDaaS) pricing often features a steep "MAU Cliff." An application that costs $0–$35/month at 5,000 users can suddenly jump to $1,500+/month once crossing 50,000 MAUs or requiring more than 5 Enterprise SAML SSO connections.

Clerk charges $25/mo base (10,000 free MAUs) + $0.02 per additional MAU and $75/mo per SAML connection, whereas Supabase Pro ($25/mo) includes 100,000 free MAUs and charges $0.00325 per additional MAU.

🛠️ Step-by-Step Engineering Calculation Guide

  1. Monthly Active Users (MAU): Configure "Monthly Active Users (MAU)" (default benchmark: 45000) or select an industry preset.
  2. Enterprise SAML / Okta SSO Organizations: Configure "Enterprise SAML / Okta SSO Organizations" (default benchmark: 3) or select an industry preset.

❓ Frequently Asked Technical Questions

Can I avoid per-MAU fees completely?

Yes. Open-source libraries like Better-Auth, Lucia, or Keycloak store sessions directly inside your own PostgreSQL/Redis database, costing $0 per MAU regardless of whether you have 10,000 or 10 million users.

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