Not a storefront platform. A complete e-commerce operating system.

Shopify provides a storefront and checkout. Everything else requires third-party apps: Klaviyo for email (variable monthly cost based on list size), Yotpo for reviews (variable monthly cost), ShipStation for shipping (variable monthly cost), Gorgias for customer service (variable monthly cost), Recharge for subscriptions (variable monthly cost), Tapcart for a mobile app (variable monthly cost). Calisto includes all of these natively: Campaigns for email, Reputation for reviews, Orderflow for shipping, Inbox for customer service, Purview for subscriptions, Apps for mobile. One subscription replaces fourteen.

Yes. The same data model that powers multi-country hotel operations and festival ticketing platforms handles high-volume e-commerce. Multi-warehouse inventory allocation, 26-carrier shipping, and multi-currency checkout are native capabilities, not bolt-ons. You do not need to upgrade to a separate enterprise tier to access fulfillment, compliance, or customer service tools.

No. Calisto is a complete platform, not a Shopify alternative with an add-on marketplace. The 14 categories of third-party apps that Shopify sellers typically install (email, reviews, shipping, support, subscriptions, mobile app, loyalty, affiliates, photography, SEO, ads, accounting, tax, analytics) are all native products within Calisto. You do not need an app store because the functionality is already built in.

Setup costs nothing and there is no credit card required to start. Core carries no additional cost. Commerce is a 1% revenue share. Every other suite is priced per app in the Marketplace. Compare that to Shopify (variable monthly cost) plus Klaviyo, Yotpo, ShipStation, Gorgias, Recharge and Tapcart, each with their own monthly cost. Most sellers spend significant monthly amounts on their e-commerce stack before they process a single order.