WeldForge WELDFORGE

What do you actually pay per month for an IdP?

Drag the slider to your MAU count. We compute each vendor's monthly list-price bill using publicly-documented pricing as of 2026 Q2. Your URL updates as you move — copy it to share the exact figures with your CFO.

100 1k 10k 50k 250k 500k
Billing cycle

How we're computing each number

Every figure is list price from the vendor's own pricing page, no discounts, no contract negotiation, no "call us for Enterprise."

WeldForge

Cloud tiers + overage

Starter $29/mo ≤ 1 000 MAU. Team $149/mo + $0.025/MAU over 10 000. Business $699/mo + $0.02/MAU over 50 000. Scale $2 499/mo + $0.012/MAU over 250 000. Annual billing; +20% if you pay monthly.

Full pricing →

Auth0

B2C Essentials / Professional

$240/mo up to 1 000 MAU, then ~$0.028/MAU overage to 7 500. Tier jumps to B2C Professional around 10 000 MAU at $1 500/mo base with its own overage curve. Enterprise required for SAML IdP, SCIM, custom domain on most plans.

auth0.com/pricing

Clerk

Pro tier + MAU overage

Free ≤ 10 000 MAU. $25/mo base on Pro + $0.02/MAU over 10 000. SAML IdP + SCIM locked behind Enterprise.

clerk.com/pricing

FusionAuth

Flat-rate Cloud Essentials

Free unlimited self-host. Cloud Essentials ~$125/mo up to 10 000 MAU, ~$225/mo up to 100 000 MAU. FusionAuth is the price leader at scale — we credit them honestly below.

fusionauth.io/pricing

Honest disclaimer These are list prices for roughly equivalent configurations. Every vendor negotiates on volume; Enterprise contracts for all four platforms typically come in 20–40% below list. What the calculator shows is the self-serve ceiling — what you pay if you never get on the phone with their sales team.
Convinced? Start on Cloud Starter (free under 500 MAU) or read the full Auth0 feature comparison if you want the side-by-side.