Uplift

Term used to describe the measurable performance increase (conversions, revenue, engagement, etc.) generated by a specific action, compared to a baseline situation. In an A/B test, the uplift represents the difference in results between the tested variant and the control group, and allows you to assess the real impact of a change on key KPIs.

In CRO (Conversion Rate Optimization), uplift is a central indicator for quantifying the incremental value of an experiment.

Examples:

• If variant B of a button (e.g., different color or wording) generates a conversion rate of 6% compared to 5% for version A, the uplift is +20%.
• If a new version of the cart page increases the average revenue per visitor (RPV) from 10 € to 12 €, the uplift is +2 €, i.e. +20% added value.
• In a test on a personalized recommendation feature, an increase in the click-through rate from 3% to 4.5% represents an uplift of +50%.

Uplift can be expressed as:

• absolute value (e.g., +2 € in RPV),
• relative percentage (e.g., +20% in conversion),
• or estimated monetary value at traffic scale (e.g., +15,000 € / month).

Note: an uplift is only meaningful if accompanied by sufficient statistical confidence, to avoid drawing conclusions based on variations due to chance.