Auth0

Enterprise CIAM platform

Free tier + paidAuth & user managementauth0.com

What it is

Okta-owned customer identity platform with deep enterprise features: SAML and OIDC federation, an extensibility rules engine, anomaly detection, compliance certifications and fine-grained authorization. The free tier covers 25,000 monthly active users. Paid B2C plans are priced by MAU band, starting at 500 users.

Why it earns a slot

Reach for it when a customer's procurement team demands SOC 2, SAML and audit logs, or when you want an identity vendor that enterprise buyers already recognize and trust.

Know before you commit

Brutal cliff: the free plan holds 25k MAU, but the cheapest paid plan is $35/mo for only 500 MAU. Enabling any single paid feature — custom database connections, enterprise MFA — drops your ceiling from 25,000 users to 500.

Getting started

npm i @auth0/nextjs-auth0

Field notes

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Pricing snapshot

Free to 25k MAU · Essentials from $35/mo (500 MAU) · Pro from $240/mo

Snapshots move fast — verify at checkout, and post a field note if it changed.

Drop into your Lovable chat

Evaluate Auth0 (https://auth0.com) for this project, then use it only if it fits what we are already building.
Context: Enterprise CIAM platform. Okta-owned customer identity platform with deep enterprise features: SAML and OIDC federation, an extensibility rules engine, anomaly detection, compliance certifications and fine-grained authorization. The free tier covers 25,000 monthly active users. Paid B2C plans are priced by MAU band, starting at 500 users.
Reviewer notes (general, not written for this codebase): Reach for it when a customer's procurement team demands SOC 2, SAML and audit logs, or when you want an identity vendor that enterprise buyers already recognize and trust.
Watch out for: Brutal cliff: the free plan holds 25k MAU, but the cheapest paid plan is $35/mo for only 500 MAU. Enabling any single paid feature — custom database connections, enterprise MFA — drops your ceiling from 25,000 users to 500.
Pricing: Free to 25k MAU · Essentials from $35/mo (500 MAU) · Pro from $240/mo
Setup: npm i @auth0/nextjs-auth0
Rules: treat the notes above as background only. Do not assume a theme, style, layout or feature that is not already in this project — inspect the existing code first and ask me before changing visual direction.

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Neighbourhood

How Auth0 sits against the rest of the atlas — swaps, companions and the tools builders actually save alongside it.