PostHog vs Mixpanel: About 7× at 5M Events

At 5M monthly analytics events, an independent 2026 calculation puts PostHog at $152.90 and Mixpanel Growth at $1,120 at its undiscounted list rate—a gap of about 7×. That comparison assumes both products receive the same number of events; discounts and collection settings can change the invoice.

PostHog is the stronger starting choice for an engineering-led team that wants lower published event charges and usage controls across analytics, replay and feature flags. Mixpanel may suit a PM-led team better when shared metrics and self-service reports drive daily work. The deciding cost question is how many events each proposed configuration will actually collect.

What do equal event volumes cost?

The PostHog analytics tier table makes the first million monthly events free, charges $0.00005 per event from one million to two million, and charges $0.0000343 from two million to 15 million. Mixpanel Growth pricing also includes one million free monthly events, then advertises $0.28 per 1,000 additional events with volume discounts available. Applying those published rates to identical, curated event streams gives these monthly analytics-only estimates:

1M events: $0 on either platform.
5M events: $152.90 on PostHog and $1,120 on Mixpanel Growth. PostHog’s figure combines $50 for the first paid million with $102.90 for the next three million.
10M events: $324.40 on PostHog and $2,520 on Mixpanel Growth.

The Mixpanel figures deliberately hold its advertised starting rate constant, so they are list-rate calculations rather than quotes for those volumes. A volume discount narrows the gap. The figures also exclude replay, flags, platform packages and any other usage a team chooses to add.

What happens when autocapture expands the event stream?

Autocapture can increase the number of billed interactions without increasing the number of business actions a team meant to measure. PostHog’s analytics meter counts captured pageviews, clicks, custom events and autocaptured events. Mixpanel also offers autocapture: its Autocapture announcement describes collection of pageviews, form interactions and clicks, alongside the option to turn off selected events or areas.

Consider a hypothetical schema in which autocapture doubles each curated monthly event stream. Doubling is an illustration, not a measured average or a default for either service. Using the same published rates, the effect on analytics charges would be:

1M curated → 2M collected: PostHog rises from $0 to $50; Mixpanel Growth rises from $0 to a $280 list-rate calculation.
5M curated → 10M collected: PostHog rises from $152.90 to $324.40; Mixpanel Growth rises from $1,120 to a $2,520 list-rate calculation.
10M curated → 20M collected: PostHog rises from $324.40 to $643.40; Mixpanel Growth rises from $2,520 to a $5,320 list-rate calculation.

The last PostHog estimate crosses into its next, lower-priced event tier; simply doubling the 10M-event charge would overstate it. These paired scenarios keep collection behavior equal across products. If one deployment sends a curated stream and the other sends many extra interactions, the equal-volume comparison no longer predicts their relative invoices. Capturing more can also create more event names and properties for someone to define, filter and maintain.

How do replay and flags affect the choice?

Replay and feature flags have different usage units from analytics events, so an event-price comparison cannot stand in for a platform budget. PostHog’s platform pricing lists 5,000 free monthly session recordings and one million free feature-flag requests. It bills products separately and allows a billing limit for each one; when a limit is reached, additional analytics events are dropped and flag requests receive a quota-limited response.

Mixpanel Growth includes session replay, reports, cohorts and feature flags in its plan comparison. Its replay allowance and flag terms use different measures from monthly analytics events, so a team expecting heavy recording or rollout activity needs to compare those allowances separately. A spending cap can make PostHog’s charge predictable, but the possibility of dropped events makes the chosen cap an operational decision as well as a financial one.

Where does governance work land?

Both products require decisions about which interactions deserve stable business names. A curated schema takes more deliberate instrumentation but makes funnels and retention reports easier to interpret consistently; autocapture gives teams more raw behavior to explore while increasing the work of selecting useful signals. Mixpanel’s plan grid lists a data dictionary and places capabilities such as event owners, data quality monitoring and verified data in its more advanced plan.

PostHog’s platform packages add controls including single sign-on, audit logs, custom roles and project permissions. Those access controls address who can manage the workspace; they do not decide which automatically captured clicks belong in a metric. For either product, governance includes the collection rules, event definitions and ownership that keep a report’s meaning stable as the interface changes.

Which workflow scores higher?

These are editorial decision scores, not product-test results. They weigh published event cost, control over collection, day-to-day analysis, integrated replay and flags, and governance for two different teams. A discounted agreement or a different mix of work could change the result.

Engineering-led team — PostHog 8/10; Mixpanel 7/10. PostHog’s graduated event rates, separate product meters and billing limits favor developers who can tune instrumentation and watch usage. Mixpanel remains a workable choice, especially where its reporting model fits the team, but its undiscounted event calculation provides less cost headroom at equal volume.
PM-led team — PostHog 7/10; Mixpanel 8/10. Mixpanel’s emphasis on reports, cohorts, saved metrics and a data dictionary favors product managers who need a shared vocabulary for self-service questions. PostHog’s linked tools remain useful, though this team must decide how much autocaptured behavior to keep and name.

For a purchase decision, estimate each configuration’s collected event count first, then compare the applicable event rate and the replay, flag and governance capacity the team needs. The published 5M-event gap is real for the stated list-rate calculation; the configuration determines whether it resembles the bill.