PostHog vs Mixpanel
for SaaS startups.
PostHog for new startups — open source, generous free tier.
What this actually means for SaaS startups.
For SaaS startups, PostHog is the modern default — open source, generous free tier, and bundles session replay, feature flags, and experiments into one tool. Mixpanel is still a strong product but the bundling story is weaker, the free tier is tighter, and most new SaaS startups simply pick PostHog by default. Mixpanel users are typically teams that adopted it 2-5 years ago and have built dashboards they don't want to migrate.
SaaS startups-specific gotchas
- PostHog's self-hosting option is real (helps with data sovereignty)
- Mixpanel's segmentation is more mature for niche use cases
- PostHog's session replay can drain bandwidth — sample carefully
- Migration from Mixpanel to PostHog is 2-4 weeks of dashboard rebuild
- Both have strong webhook + Reverse ETL integrations
A Series A SaaS picks PostHog. They get product analytics, session replay, and feature flags from one tool — replacing what would have been Mixpanel + LogRocket + LaunchDarkly. Total monthly cost: $500 vs $2,400 for the three-tool stack.
Pick by use case.
PostHog
Default — open-source, generous free tier, session replay built-in.
Mixpanel
You're already on Mixpanel and migration isn't worth it.
Direct comparison.
| Feature | PostHog | Mixpanel |
|---|---|---|
| Open source | Yes | No |
| Session replay | Built-in | Add-on |
| Feature flags | Built-in | No |
| Pricing | Generous | Tighter |
| Enterprise SSO/SOC2 | Yes | Yes |
| Self-hosting | Yes | No |
We've shipped both.
If you're evaluating these as a SaaS startups, brief us — we can save you weeks.
Talk to usCommon SaaS startups questions.
Is PostHog's free tier really sustainable?
Yes for most startups under 1M events/month. Past that, paid tier is reasonable.
What about Heap or Amplitude?
Heap for auto-capture preference; Amplitude for mature product orgs. Both viable.