PostHog vs Postmark
Side-by-side plans, pricing, and feature gates for PostHog and Postmark, verified . PostHog is primarily analytics; Postmark is primarily transactional email.
Plans side by side
Every published plan from each vendor, with the headline monthly anchor price. Some prices scale with subscriber count or seats; full detail lives on each tool's page.
PostHog
- Free + Pay-as-you-go
Generous free tier across every product
Free - Boost
Add-on: Boost
$250/mo - Scale
Add-on: Scale
$750/mo - Enterprise
Add-on: Enterprise
Custom
Postmark
- Free
100 emails per month, no credit card required
Free - Basic
Entry paid tier with 10,000 emails/month and 5 custom domains
$15/mo - Pro
10,000 emails/month with inbound processing and customizable retention
$16.50/mo - Platform
Unlimited domains and users with the lowest overage rate
$18/mo - High-Volume
Custom pricing for volumes above standard tiers
Custom
Limits at the entry paid tier
Compares Boost (PostHog) against Basic (Postmark). Both are the lowest-priced non-free, non-custom plan on each side.
| Limit | PostHog | Postmark |
|---|---|---|
| Emails / month | · | 10,000 |
When PostHog wins
- Technical product teams that want one tool covering analytics, experiments, replay, and surveys
- Startups under 1M events per month, where the free tier covers the entire stack
- Companies committed to open-source infrastructure who want the option to self-host
Where PostHog is the wrong fit
- Marketing-only teams who need attribution and campaign analytics (Mixpanel or GA4 fit better)
- Enterprises with strict procurement that requires a SaaS-only vendor with no self-hosted option in scope
- Non-technical users who cannot navigate event-based analytics UIs and SQL-style insights
When Postmark wins
- SaaS apps prioritizing receipt and notification deliverability
- Teams that need detailed inbound email parsing alongside outbound sends
- Companies that need 365-day data retention for compliance
Where Postmark is the wrong fit
- Hobby projects with bursty traffic (Mailgun's 100/day or Resend's 3,000/month are friendlier than the 100/month Free cap)
- Marketing teams (use Mailchimp or Kit)
- Buyers who want a single vendor for marketing and transactional email
Common questions
- Is PostHog cheaper than Postmark?
- Both PostHog and Postmark have free or custom entry pricing, so a direct entry-tier price comparison is not meaningful.
- Does PostHog or Postmark have a free plan?
- Both have free plans. PostHog: Generous free tier across every product. Postmark: 100 emails per month, no credit card required.
- Are PostHog and Postmark in the same category?
- No. PostHog is primarily a analytics tool; Postmark is primarily a transactional email tool. They overlap on use case but sit in different primary categories, so the comparison is between adjacent tools rather than direct competitors.
- Which has more plans, PostHog or Postmark?
- Postmark ships 5 plans; PostHog ships 4. Postmark's longer ladder gives more granular upgrade steps, which can mean smoother price escalation as your team scales.
- Where can I see alternatives to PostHog or Postmark?
- Each tool has a dedicated alternatives page on TierGauge with ranked options and verified pricing: /alternatives/posthog for PostHog and /alternatives/postmark for Postmark. Alternatives are derived from each tool's editor-flagged competitors plus same-category tools we track.
PostHog: https://posthog.com/pricing · Postmark: https://postmarkapp.com/pricing
Last verified . Pricing changes between refreshes; confirm at the vendor before purchasing.