OpenAI vs Postmark: which is cheaper?

OpenAI starts at an unpublished tier, while Postmark starts at $15/mo. TrackRival snapshots both daily as plan pages change.

Does OpenAI or Postmark have a free plan?

Postmark shows a free plan in the latest snapshot, while OpenAI does not.

Is OpenAI a good ai alternative to Postmark?

OpenAI is tracked in ai, while Postmark overlaps for similar buyers. Use the changelog section below to compare shipping cadence before you choose.

How often is this OpenAI vs Postmark comparison updated?

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

OpenAI vs Postmark

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

OpenAI

AI for everyone.

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

See full OpenAI 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

OpenAI

Pricing data is being collected.

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