Sylius vs Medusa.js: architecture and extensibility

In Sylius vs Medusa.js, the main dividing line is the technology your team can maintain: Sylius is a PHP framework built on Symfony, while Medusa is a TypeScript commerce platform running on Node.js. For extensibility, B2B and multi-store, both expect developers to write code. The right question is therefore less about features and more about who will own that code in three years. Everything below comes from their documentation, as read on 1 November 2026.

My own work is on Sylius and Symfony, so I have an interest in this comparison. I do not offer Medusa projects. If your team lives in TypeScript, the sections below may well point you away from me.

Sylius vs Medusa.js architecture

The Sylius documentation describes a headless, open source framework built on Symfony. Its architecture page presents standalone components, Symfony bundles, a core that connects them, and shop, admin and API contexts. A classic shop comes with it, so you are not obliged to build a separate frontend.

The Medusa architecture page describes a server based on Express.js, where API routes are the main entry point. Those routes run workflows, which contain the business logic, and workflows call modules, which handle each domain. Medusa only supports PostgreSQL as its underlying database. The project repository tags it with TypeScript, JavaScript and Node.js. Being headless, Medusa has storefronts and dashboards consuming its API; it also provides a Next.js starter storefront.

Extensibility: two ways of changing the product

With Sylius, the official page says you can replace or override any service, entity or view, while the customization guide favours Twig hooks over copied templates. This is the Symfony way of working: you adjust a framework through configuration and replacement of services.

With Medusa, you add API routes, workflows and modules. The documentation describes workflows as the home of business logic, and the B2B recipe shows custom modules linked to existing customers and groups, plus widgets and new routes for the admin. If your developers already build Node.js services, this will feel familiar.

Neither approach removes upgrade work. Each custom piece is code that must follow the product's new versions. Ask any provider to show how they separate custom code from the base, and how many days the last upgrade took.

B2B: what the documentation really promises

Medusa is explicit. Its B2B recipe builds on sales channels, customer groups, price lists and publishable API keys, and states that there is no built in company model, so complex needs involve custom modules. There is also a ready to use B2B starter, and a guide to quote management. A starter speeds up the beginning, but once you adapt it, it becomes your code to maintain.

The Sylius page lists complex B2C and B2B use cases, ERP, CRM and PIM integrations, and mentions Sylius Plus for advanced needs such as role based access control and multi source inventory. It does not detail prices or company accounts there. Before you decide, get the exact scope in writing. My article on Sylius B2B features goes further on this point.

Multi-store: read the wording closely

Multi-store can mean several very different things. In Sylius, a channel can have its own countries, shipping methods, payment methods and promotions or prices. In Medusa, a sales channel controls product availability and scopes carts. Its Store Module lets you create several stores, but the documentation states that Medusa does not natively support multi-tenancy, and that you must build the links between stores and resources yourself.

So describe your case precisely before comparing. Selling one catalog in several countries, running several brands under one company, and hosting independent merchants are three separate projects. The last one, a true marketplace or multi-tenant setup, needs a dedicated specification on either platform.

When to choose which, and when neither fits

Sylius tends to fit a team with PHP skills, or an existing Symfony system to integrate with, and a store that wants a shop included from the start. Medusa tends to fit a product team that already works in TypeScript and intends to build its own storefront. If you have no technical team and a standard catalog, neither is a natural first choice: a hosted platform such as those covered in my Sylius vs Shopify, WooCommerce and Magento comparison will likely be simpler.

For a useful decision, write down who maintains the store next year, what your integrations are, and how your buyers order. If that points to PHP and Symfony, you can explain your project on my Sylius developer page. If it points to Medusa, a specialised TypeScript team will serve you better, and I would tell you the same in a call.