Auth0 vs Customer.io: which is cheaper?

Auth0 starts at $35/mo, while Customer.io starts at an unpublished tier. TrackRival snapshots both daily as plan pages change.

Does Auth0 or Customer.io have a free plan?

Auth0 shows a free plan in the latest snapshot, while Customer.io does not.

Is Auth0 a good auth alternative to Customer.io?

Auth0 is tracked in auth, while Customer.io overlaps for similar buyers. Use the changelog section below to compare shipping cadence before you choose.

How often is this Auth0 vs Customer.io comparison updated?

TrackRival refreshes pricing snapshots daily and appends new changelog entries whenever either product ships a release.

Auth0 vs Customer.io

A side-by-side comparison of pricing, plans, and recent product updates. Pricing data last refreshed May 14, 2026.

Auth0

Authentication and authorization platform.

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Category: auth
Plans tracked: 4
Entry price: $35/mo
Free plan?: Yes

See full Auth0 pricing & changelog →

Customer.io

Messaging automation for lifecycle and product email.

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Category: email
Plans tracked: —
Entry price: —
Free plan?: —

See full Customer.io pricing & changelog →

Plan-by-plan pricing

Auth0

Free

Auth0

Free

Up to 25,000 monthly active users
1 Custom Domain*
Secure Agentic AI workflows
Passwordless Authentication
Unlimited Social Connections**
+ 1 more

Essentials

Auth0

$35/mo

Up to 500 monthly active users
Everything in Free, plus...
Higher Auth, API limits, and Feature limits
Pro Multi-Factor Authentication
Role-based Access Control Per Organization
+ 1 more

Professional

Auth0

$240/mo

Up to 500 monthly active users
Everything in Essentials, plus...
Use your existing User Database for Logins
Enterprise Multi-Factor Authentication
Enhanced Attack Protection
+ 1 more

Enterprise

Auth0

Custom

Everything in Professional plus...
Custom User & SSO Tiers
99.99% SLA
Enterprise Rate Limits
Enterprise Administration & Support
+ 1 more

Customer.io

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