Amplitude review

What Amplitude actually does

Amplitude answers questions about behaviour rather than traffic. Instead of counting visits to a page, it records events, actions a person took inside a product, and then lets an analyst ask what happened between them. Which step of onboarding loses the most people. Whether users who create a project in week one are still active in week six. What separates the accounts that convert from the accounts that stall. The unit of analysis is a sequence of actions attached to a user identity, which is why the same data set can produce a funnel, a retention curve and a behavioural cohort without being modelled three times.

Over the past few years the product has widened well past analysis. Session replay records what a user actually saw, and because replays are indexed by event, a drop-off in a funnel leads directly to the sessions where it happened. Feature experimentation and flag management run on the same event stream, so a test result and the product metrics agree by construction rather than by reconciliation. Web analytics covers marketing pages with a single snippet, guides and surveys collect qualitative feedback in-product, and data governance tools police the event taxonomy before it decays. Warehouse and CDP connections run in both directions, into Snowflake, BigQuery, Redshift and Databricks, and through Segment, mParticle, RudderStack and Tealium.

Key features

The platform is broad, but a handful of capabilities carry most of the value.

• Funnels, retention analysis, user paths and custom event formulas over raw behavioural data
• Behavioural cohorts that can be built once and synced to Braze, Klaviyo, HubSpot or advertising platforms
• Session replay indexed against the events in the session
• Experimentation and feature flags sharing the analytics event stream
• Web analytics for marketing pages alongside product events
• Governance tooling for event taxonomy, schemas and warehouse import and export

Who it's for

Amplitude fits a team that ships software and can act on what it learns: a product manager who can reprioritise a roadmap, a growth engineer who can run a test, a founder deciding which half of the product to keep. The free tier is unusually generous, covering two million events a month with unlimited seats, which means a small team can adopt it before there is a budget line for analytics at all.

It is the wrong tool for a content site or a brochure business, where Google Analytics or Plausible answer the actual questions for far less effort. It also punishes teams that do not invest in instrumentation. Amplitude is only as good as the events sent to it, and a taxonomy assembled ad hoc by three engineers over two years produces dashboards nobody trusts. Someone has to own naming, properties and the definition of an active user, or the tool becomes expensive decoration.

How it compares

Mixpanel is the closest competitor and is often quicker to learn, with a cleaner default reporting experience, while Amplitude goes deeper on cohorting, governance and the analysis of long user journeys. PostHog bundles analytics, replay, flags and surveys in one open-source package and appeals to engineering-led teams that want to self-host, though its analysis layer is less refined for non-technical users. Heap's autocapture removes the instrumentation burden that Amplitude imposes, which is genuinely attractive early on, at the cost of a messier data set later. Google Analytics 4 remains free and adequate for acquisition reporting, and unsuited to product questions.

Verdict

Amplitude is the reference product for behavioural analytics, and the combination of analysis, replay and experimentation on a single event stream removes a category of tooling arguments that other stacks never resolve. A serious small team can run on the free tier for a long time. The caveats are the ones that arrive with growth: cost is a function of event volume, so instrumentation choices become budget choices; access controls that a security reviewer will ask about sit behind the quote-only tiers; and session replay is capped rather than unlimited. Adopt it with someone owning the taxonomy, and it repays the discipline.