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Home/Compare/Postmark vs Auth0

Postmark vs Auth0

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

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 →

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 →

Plan-by-plan pricing

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

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 vs Auth0 FAQ

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

Which should you pick?

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

  • Choose Postmark if you value: reliable transactional email.
  • Choose Auth0 if you value: authentication and authorization platform.
  • 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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