Amplitude: Product Analytics Guide

What is Amplitude

Amplitude is a product analytics platform built for product and growth teams. Unlike Google Analytics, which centers around sessions and pageviews, Amplitude organizes everything around events and users: what they do, in what order, and why they drop off.

Founded in 2012, Amplitude handles data for over 2,000 companies including brands like Atlassian, Walmart, and Booking.com. Its strength is the ability to build funnel, cohort, and retention analyses without writing SQL or relying on a data team.

For any conversion rate optimization strategy, having granular visibility into user behavior is the first step. Amplitude provides that visibility.

Core features

Event tracking

Amplitude records every user action as an event with properties. An event can be "add_to_cart" with properties like product_id, price, category, and source. This structure allows you to analyze behavioral patterns in great detail without the constraints of the traditional session model.

Funnels and conversion

Amplitude's funnels let you define event sequences and measure conversion between each step. Unlike GA4 funnels, Amplitude allows you to:

Define custom conversion windows (1 hour, 7 days, 30 days)
Segment the funnel by any user or event property
See the average time between steps
Identify the exact drop-off points

Cohort analysis

Cohorts group users by shared behavior. You can create cohorts like "users who added to cart but didn't purchase in the last 7 days" and export them to activation tools like Klaviyo or Braze for recovery campaigns.

Retention

The retention analysis shows what percentage of users return after their first interaction. Amplitude lets you differentiate between usage retention (returns to the product) and purchase retention (returns to buy), which is critical in eCommerce.

Amplitude vs alternatives

Feature	Amplitude	Mixpanel	PostHog	GA4
Data model	Events	Events	Events	Sessions + Events
Advanced funnels	Excellent	Good	Good	Basic
Native retention	Yes	Yes	Yes	Limited
Session replay	Yes (add-on)	No	Yes	No
Free plan	Up to 50M events/month	20M events/month	Unlimited self-hosted	Unlimited
Learning curve	Medium	Medium	Medium-High	Low

If you already use PostHog or Mixpanel, Amplitude won't always be a step change. Its advantage shows for product teams that need collaborative notebooks, integrations with experimentation tools, and enterprise-scale data governance.

How to use Amplitude for CRO

Identifying friction points

Set up a funnel from landing page to completed purchase. Segment by device, traffic source, and user type (new vs returning). The largest drops between steps tell you where to prioritize tests.

Validating hypotheses before testing

Before launching an A/B test, use Amplitude to confirm the problem exists with data. If you think checkout has friction, first measure the actual drop and segment by cohort. Many hypotheses get discarded before spending traffic on a test.

Measuring post-test impact

After an experiment, Amplitude lets you measure not just direct conversion but secondary metrics: 7-day retention, average order value, and return rate. This prevents optimizing one metric at the expense of another.

Real case: analytics in eCommerce

In eCommerce CRO projects, we combine Amplitude data with session replay tools like FullStory or Microsoft Clarity to get the full picture: what users do (Amplitude) and why they do it (replay). This combination cuts diagnostic time and increases test win rates.

Recommended setup

Tracking plan: document every event and its properties before implementing
Taxonomy: use consistent snake_case (add_to_cart, purchase_completed)
User properties: define relevant user properties (plan, lifetime_value, source)
Group analytics: if you have a B2B model, configure accounts as a group
Governance: enable the governance module to prevent duplicate or misspelled events

Limitations

The learning curve for non-technical teams is real
The free plan is generous on events but limits advanced features (notebooks, data governance)
Integrating with external testing tools requires technical setup
Session replay is a paid add-on, not included in the base plan

Conclusion

Amplitude is the go-to tool when you need to understand user behavior beyond pageviews. For CRO teams, it's especially useful for prioritizing where to test, validating hypotheses with data, and measuring the real impact of experiments.

If you're looking to improve your conversion metrics with data, a good starting point is a professional CRO audit that identifies exactly where revenue is leaking in your funnel.

Adrià Vidal — CRO & Digital Strategy at Boost