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Home/Compare/Auth0 vs Postmark

Auth0 vs Postmark

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 →

Postmark

Reliable transactional email.

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Category
email
Plans tracked
4
Entry price
$15/mo
Free plan?
Yes
See full Postmark 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

Postmark

Free

Postmark

Free
  • Test your integration with 100 emails/month
  • No overages allowed in this plan
  • Perfect for testing and side projects with low volume
  • Up to 10 custom sending domains
  • Up to 10 servers
  • + 1 more

Basic

Postmark

$15/mo
  • Extra emails @ $1.80 / 1,000
  • Industry-leading deliverability rates & speed
  • 45-day data retention
  • 5 Custom sending domains
  • Unlimited emails/day
  • + 1 more

Pro

Postmark

$16.5/mo
  • Extra emails @ $1.30 / 1,000
  • Customizable data retention up to 365 days (45-day default)
  • 10 Custom sending domains
  • Inbound email processing
  • Unlimited emails/day
  • + 1 more

Platform

Postmark

$18/mo
  • Extra emails @ $1.20 / 1,000
  • Customizable data retention up to 365 days (45-day default)
  • Unlimited Custom sending domains
  • Inbound email processing
  • Unlimited users
  • + 1 more

Auth0 vs Postmark FAQ

Auth0 vs Postmark: which is cheaper?
Postmark starts at $15/mo, while Auth0 starts at $35/mo in the latest snapshot.
Does Auth0 or Postmark have a free plan?
Both Auth0 and Postmark show a free plan in the latest snapshot, so the plan tables above are the fastest way to compare limits.
Is Auth0 a good auth alternative to Postmark?
Auth0 is tracked in auth, while Postmark overlaps for similar buyers. Use the changelog section below to compare shipping cadence before you choose.
How often is this Auth0 vs Postmark comparison updated?
TrackRival refreshes pricing snapshots daily and appends new changelog entries whenever either product ships a release.

Which should you pick?

Both Auth0 and Postmark serve overlapping audiences (Auth0 in auth, Postmark in email).

  • Choose Auth0 if you value: authentication and authorization platform.
  • Choose Postmark if you value: reliable transactional email.
  • Subscribe to TrackRival if you want to be notified whenever either of them changes pricing or ships a major update — so you can react before your competitors do.

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