PostHog vs Mixpanel for startups:

For PostHog vs Mixpanel, pick PostHog if you want analytics, session replay, feature flags, experiments and error tracking from one SDK and one bill, and your engineers will own the setup. Pick Mixpanel if you mainly need funnels, retention and reports that non-engineers can build, and you already use other tools for flags and testing.

Both have a free plan up to 1M events a month, so the choice comes down to what else you need, not the chart UI.

This guide compares the free tiers, setup, replay, flags and experiments, using each company’s own pricing and docs pages. Whichever you pick, the hard part is the same: tracking you can trust, with a short list of events that match how your product makes money.

The short version

• Both are free up to 1M events a month, with no seat limits on the free plan.
• Pick PostHog if you want analytics, replay, flags, experiments and error tracking from one SDK and one bill.
• Pick Mixpanel if you mainly want reports, funnels and retention that the whole team can use, and you’ll add other tools for the rest.
• For B2B, both charge extra for company-level (group) analytics, so check that before you plan reports around accounts.
• Track 5 to 8 events well before you track 50 badly. The tool matters less than the tracking plan.

PostHog vs Mixpanel at a glance

Last checked on 26 Oct 2026. Prices and limits change, so confirm on PostHog’s pricing page and Mixpanel’s pricing page before you sign up.

Pricing and free tiers

Both tools start free and charge by usage after that, so cost depends on how many events you send, not how many people log in.

PostHog. The free allowance resets every month and covers each product separately: 1M analytics events, 5K session recordings, 1M feature flag requests, 100K error tracking exceptions and 1,500 survey responses. The free plan has unlimited team members, 1 project and 1 year of data retention, and usage stops when you hit a free limit. Pay-as-you-go adds more projects and longer retention, and you can set a billing limit per product. (PostHog pricing)

Mixpanel. The Free plan covers up to 1M events and 10K session replays a month, unlimited seats, funnels and retention, up to 10 active feature flags and experiments for up to 1K monthly experiment users. The Growth plan also starts at $0, with the first 1M events free, and you pay per event above that. (Mixpanel pricing)

Startup programs. Both run one, with different rules.

• PostHog for Startups gives $50,000 in credits for 12 months to companies founded in the last 2 years that have raised under $5M, with a company email domain and a paid plan. (PostHog for Startups)
• Mixpanel’s startup program gives a first year free, including 1 billion events and 1 million session replays, to companies founded under 5 years ago with up to $8M in funding. (Mixpanel pricing, Mixpanel startups)

Check the terms on the day you apply. Credits and limits change.

Setup: what an early team actually has to do

The install is the easy part. Both have SDKs for web, mobile and servers, and both can autocapture clicks and page views. The work is deciding what to send.

1. Name your key events. Write a short list of actions that matter, like signed_up, activated and subscription_started, and use the same names everywhere. Autocapture is useful for exploring, but don’t build your main reports on it.
2. Identify users. Call identify when someone signs up or logs in, so events from before and after login join up to one person. If you skip this, your funnels will undercount.
3. Send key events from your server. Payments and plan changes should come from your backend, not the browser, so ad blockers and closed tabs don’t lose them.
4. Add company-level analytics if you sell B2B. You’ll want to see which accounts are active, not only which people. In both tools this is a paid add-on (PostHog calls it group analytics; Mixpanel lists group analytics as an add-on on Growth and Enterprise), so plan for it or keep a company ID as an event property until you need it.
5. Tag your links. Use UTM tags on every campaign link so sign-ups can be traced to a source. Our UTM builder makes this quick.

If you also have a mobile app, install tracking is a separate job. Our guide on how to track app installs covers it.

Session replay, feature flags and experiments

This is where the two differ most.

PostHog treats them as products in their own right, each with its own free allowance, all sharing one SDK and one set of users. Experiments are billed with feature flags. Free-plan recordings are kept for 1 month. (PostHog pricing)

Mixpanel includes session replay on its Free plan (10K a month, kept for 30 days), plus feature flags and experiments with limits on Free. (Mixpanel pricing)

For an early team, the real question is whether you’ll use them. Replay is worth it from day one, because watching five people fail at onboarding teaches more than a chart. Flags and experiments only pay off once you have enough traffic to test, so don’t pick a tool for them alone.

When PostHog fits better

• You want one tool, one SDK and one bill for analytics, replay, flags, experiments and error tracking.
• Your engineers will own the setup and like working in code, SQL and docs.
• You want an open source option or a hard stop at the free limits while you’re small.
• You want to start on a free plan and only pay per product as each one grows.

When Mixpanel fits better

• You mainly need product analytics: funnels, retention and user flows that non-engineers can build.
• You want more session replays on the free plan (10K a month vs PostHog’s 5K).
• You already use other tools for flags, testing or errors and don’t want to move them.
• You qualify for its startup program and want a full year of the full product.

What about Amplitude?

Amplitude is the third name in most of these comparisons. Its Free plan covers 2M events a month with no card, 10K monthly session replays, unlimited feature flags, 1 active experiment and unlimited seats, with an EU data center option. Its Startup Scholarship gives a free year of the Growth plan to companies with under $10M in funding and under 20 employees. (Amplitude pricing) Like Mixpanel, it’s analytics first, so the choice is the same: one bundled tool, or a focused one plus others.

The 5 to 8 events to track first

Whichever tool you pick, start with the events that describe how a user becomes a paying customer. For most products that’s:

1. signed_up
2. onboarding_completed
3. activated, the one action that shows someone got value (your activation milestone)
4. core_action, the thing people come back to do
5. invited_teammate, if your product is used by teams
6. trial_started and subscription_started
7. subscription_cancelled

Add properties like plan, source and company ID to each one. Then build three reports: a sign-up to activation funnel, weekly retention, and sign-ups by source. Our guide to early-stage startup metrics explains which numbers to watch, and the SaaS activation rate benchmark helps you judge your activation step.

Do you need any of this before product-market fit? A few events and replay, yes, because they show you where people get stuck. A big dashboard, no.

FAQ

Is PostHog free for startups?

Yes, up to its monthly free allowances, which include 1M analytics events, 5K session recordings and 1M feature flag requests, with no card needed. Young startups that qualify can also apply for PostHog for Startups credits, which need a paid plan.

Is Mixpanel free?

Yes. The Free plan covers up to 1M events and 10K session replays a month, with unlimited seats. Startups founded under 5 years ago with up to $8M in funding can apply for a free first year through its startup program.

Which is better for B2B SaaS, PostHog or Mixpanel?

Neither wins by default. Both need a paid add-on for company-level analytics, so compare that cost first. Choose PostHog if you also want flags, experiments and error tracking in the same tool, and Mixpanel if you want focused analytics that the whole team can use.

Can I switch from Mixpanel to PostHog later?

Yes. PostHog publishes a Mixpanel migration guide and offers a managed migration that imports your Mixpanel data. Switching is easier if your event names are clean and documented, so keep a tracking plan from the start.

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