Upgrade (montée en gamme)
An upgrade refers to a customer moving from a base plan to a higher-value, higher-margin plan. It is a revenue growth lever that adds income from existing customers without any additional acquisition cost.
In practice
A PageOneBoost customer on the Starter plan at €49/month manages three sites. When a fourth site exceeds the audit limit, a contextual in-app prompt offers the Growth plan at €99/month. This usage-based trigger outperforms a generic email campaign. Expansion revenue — additional income from existing customers — can represent 30 to 40% of total growth for a mature SaaS with low churn.