The Ecomm Analyst

Amplitude is a product analytics platform. Funnels, retention, cohorts, session replay, and experimentation, with a free Starter tier that is genuinely generous and paid plans that begin around fifty dollars a month before stepping up to custom enterprise pricing. It is a serious tool for understanding what people do inside your product.

The reasons to look elsewhere are mostly cost and fit. Past the free tier the billing on tracked users and events climbs quickly, and overages are not gentle, so the median enterprise contract lands well into five figures a year. For an e-commerce brand it answers product behavior, not which marketing drove the revenue. And the upfront data-model work is real if you want clean reporting.

Here is where I would look instead.

Mixpanel

Mixpanel is the closest rival, with similar funnels and retention depth and an equally generous free tier. The two trade blows on interface and pricing more than capability. If Amplitude’s cost curve is the problem and you still want explicit event analytics, this is the first place to look.

Heap

Heap takes the autocapture route, recording interactions so you skip most of the instrumentation and can analyze events retroactively. That is useful when your questions keep changing. The tradeoff is messier data and annual contracts that get expensive at scale.

PostHog

PostHog is the open-source option, with autocapture, pay-as-you-go pricing, and a self-host path. For teams that want control over their data and no annual lock-in, it is the obvious pick. It leans more engineering-heavy than Amplitude, so it suits teams with developers in the loop.

ThoughtMetric

ThoughtMetric is what I use, and it matters because the question behind a lot of Amplitude evaluations is really which campaigns and channels drive purchases and lifetime value. That is attribution, not product analytics. ThoughtMetric does multi-touch attribution with cohort and LTV views built for e-commerce. The tradeoff is that it will not replace in-app funnel and retention analysis, so if you genuinely need product behavior, keep one of the tools above.

GA4

Google Analytics 4 is free and covers web behavior plus the basics of acquisition. It is clunky, but for a lot of e-commerce teams paying for product analytics at all is the wrong call, and GA4 plus a dedicated attribution tool covers more ground for less.

Picking between these

• If you want explicit event analytics without the cost curve, Mixpanel.
• If you do not want to instrument events, Heap.
• If you want open source and no lock-in, PostHog.
• If your real question is which marketing drives revenue, ThoughtMetric.
• If free is enough, GA4.

Amplitude is excellent at product behavior, and most teams reaching for it have a real behavior question. The trap for e-commerce operators is paying enterprise prices to answer a marketing question it was never built for. Decide whether you are asking what users do or what made them buy, then pick accordingly.