OpenMail vs PostHog
OpenMail and PostHog are both developer tools tools aimed at developers and small businesses. Both have a free plan.
Email inboxes for AI agents, with replies pushed by webhook
Open-source product analytics, replays and flags
| Pricing | Freemium | Freemium |
| Starting price | Not published | Not published |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Built for | Developers, Small businesses | Developers, Small businesses |
| Platforms | web | web |
| Country | LT | US · 2020 |
| Rating | — | — |
Choose OpenMail if
Developers building AI agents that need their own email address to receive, thread and answer mail.
- Built for receiving and replying, not only sending
- Each inbox has its own sending reputation
- Free plan needs no credit card
Look elsewhere if: Teams that mainly send marketing or transactional email at high volume (Resend, MachineMail).
Choose PostHog if
Engineering-led startups and scale-ups that want analytics, replay, flags and experiments without three vendors.
- Several products in one with shared data
- Generous free allowances; usage-based beyond
- Open source and engineer-friendly
Look elsewhere if: Marketing-only web analytics (Plausible) or large enterprises standardized on Amplitude.
OpenMail vs PostHog pricing
OpenMail
- Free€0/mo3 inboxes, 3,000 emails/mo (100/day), 3 GB, openmail.sh addresses
- Pro€9/mo10 inboxes, 10,000 emails, custom domains; then usage-based
- EnterpriseCustomDedicated sending IPs, SSO, 1-hour SLA, custom DPA
PostHog
- Free$01M events, 5K recordings, 1M flag requests, 1,500 survey responses/mo
- Pay-as-you-gofrom $0.00005/per eventPer product after free tier, as low as $0.000009/event; billing limits
- Boost$250/moPlatform package: unlimited projects, SSO enforcement, HIPAA BAA
- Scale$750/moPriority support, SAML; includes Boost
- EnterpriseCustomRBAC, dedicated support, training
OpenMail · Key features
- One API call or CLI command creates a dedicated agent inbox
- Inbound mail delivered in real time over webhook or WebSocket
- Full email threading so agents reply in the same conversation
- PDF, CSV and image attachments parsed into plain text (extra cost)
- Allow and block rules per address or domain
- Custom domains with DKIM, SPF and DMARC on Pro
Cons
- Pricing page mixes $9 and €9; overage rates are in euros
- Free plan caps sending at 100 emails a day
- Free plan appends a "Sent with OpenMail" footer
PostHog · Key features
- Product analytics: funnels, retention, paths, trends, lifecycle
- Session replay with console and network logs
- Feature flags and multivariate experiments
- Surveys and in-app feedback
- Data warehouse, HogQL SQL and CDP destinations
- Error tracking and LLM observability
Cons
- UI can feel dense; analytics UX trails Amplitude
- Costs need monitoring across many products
- Self-hosting only recommended for small scale
OpenMail vs PostHog: FAQ
Do OpenMail and PostHog have a free plan?
Yes, both OpenMail and PostHog have a free plan; paid plans add more usage and features.