No additional charges. Once starting a plan the price is fixed.
Basic

Up to 5 managed collections

Updates once a day

Multi-segment collections

Product insights
Starter

Up to 30 managed collections

Updates twice a day

Product reviews integration

Product grouping

Collection page cross-sell
Advanced

Up to 100 managed collections

Updates 4 times a day

A/B Testing

AI Personalized landing page for email marketing

Products metafields support

Inventory location support
Superior

Up to 200 managed collections

Updates hourly

AI Personalized collections on store's site

Loop returns integration