Pick a Product Analytics Tool by Activation and Churn

You are comparing PostHog, Amplitude, and Mixpanel for a funnel that has a real activation event and a real churn problem. The tool that wins should make both inspectable before it makes dashboards pretty.

P75 activation exposes the churn risk

Median hides the tail. P75 time to activation is usually more actionable than median because users who activate slowly are at higher risk of churning before activation. Tools that only show an average give you a number that can be dragged by a few fast users. Request the distribution, not the headline.

Run the activation check on your own funnel. Pick a real activation event, ask the tool to show the distribution of time from signup to that event, and see whether you can filter by segment. Lone numbers hide the slow middle. Tables or charts are more useful when they can support a decision.

Cohorts show where the leak is

Retention curves can be smooth while the product is leaking. Cohorts let you compare users by signup week, activation state, or segment, and see whether the leak is new users or existing accounts. PostHog's no-cost tier covers funnel, retention, path, cohort, and lifecycle analysis. That gives you a way to test the core question without paying first.

Split users by the week they signed up, then compare the percentage that reach activation early against the percentage that reach it later. Much smaller later groups suggest the product is losing people before they understand it. When the tool cannot hold that comparison, you are left with a monthly average that hides the leak.

Credits and limits hide the real price

Credits can make a tool look cheap for a while. They do not fix a missing metric. A startup younger than two years and with under $5M raised may receive one year of $50,000 in PostHog credits through the PostHog for Startups program.

Amplitude's published free allowance is 2 million events per month, with unlimited seats on all plans and a Plus tier beginning at $49 per month. Mixpanel's startup offer gives a first year free to companies founded fewer than five years ago with no more than $8M total funding, provided they have not redeemed another offer.

Write down your current monthly event volume, multiply it by a realistic growth rate, and check where the bill lands. Free allowances can be generous while actual usage is still small. Vendors that will not tell you the overage behavior are not giving you a real price.

If you sell to companies, account-level reporting is often the core need. For B2B analytics, Amplitude, Mixpanel, and PostHog treat account-level reporting as a paid add-on and do not publish its price. Request the price in writing before you accept any offer. User-level views can be misleading when your customer is a company: accounts may have a handful of seats, and the only active user may be the person who matters. Check whether the tool can group events by account, show account-level reporting, and separate active users from the whole team. Sales calls are a cost, not a detail.

The five checks that separate a tool from a demo

Product analytics comparisons that only compare feature tables miss the part you actually need: whether the tool can show your funnel in the shape your team uses. Use the list as a quick filter. Vendors that cannot answer a check have a data gap, not a sales objection.

PostHog's AI assistant supports natural-language requests that produce SQL, funnel and retention visualizations, dashboards, session-replay summaries, survey drafts, and metric-debugging help. Assistant output is only useful if it can be checked. Have the assistant explain a metric, build a funnel, or draft a survey, then compare the result with a query you can run yourself. Pretty sentences with no underlying data are demos. Something you can inspect may save time.

• P75 activation: can you see the 75th percentile time to activation, not just median?
• Retention/cohort: can you build a signup-week cohort and compare activated users against everyone else?
• Account-level reporting price: if you sell to companies, request the add-on price in writing.
• Event and seat limits: confirm the monthly event cap, seat count, and what happens when you exceed them.
• Verifiable AI assistant output: ask the assistant to produce SQL, a funnel, a retention chart, a dashboard, a session-replay summary, a survey draft, or a metric-debugging note, then check the result.

Send the five answers to each vendor, then compare the missing account price against your event-volume math.