Anyone building an online shop today – or replacing an existing one – faces a decision that can shape ten years of operations: do you buy a ready-made platform and adapt your business logic to fit its constraints, or do you build an architecture that follows your business model?

For many companies, Shopify is the right answer to that question. It can be set up in hours, operates reliably, and has a vast app ecosystem. Much the same applies to WooCommerce when WordPress is already in use. We recommend both systems where they fit – and we recommend MedusaJS where they reach their limits.

Those limits are real, and they arrive sooner than expected. As soon as the business logic becomes more complex – individual pricing structures for B2B customers, multi-step checkout flows, PIM integrations, country-specific tax and fulfilment logic – the Shopify app ecosystem starts to grow, and with it the monthly costs and dependencies. With WooCommerce, plugin conflicts and performance problems begin to surface under load. Both systems were optimised for the standard case. MedusaJS was built for the case where the standard case isn't enough.

What MedusaJS Is – and What It Isn't

MedusaJS is an open-source commerce engine: a Node.js backend that exposes all the core functions of a modern shop as an API – product catalogue, pricing logic, cart, checkout, order management, promotions, fulfilment, multi-currency, multilingual support. The frontend is fully decoupled. We typically build it with Next.js, which enables load times in the millisecond range, excellent Core Web Vitals, and strong SEO characteristics.

What MedusaJS is not: a ready-made platform with themes and a click-to-setup process. The barrier to entry is higher than with Shopify or WooCommerce. If you need a working shop with standard functionality in three days, Shopify will serve you better. If you're building a commerce platform that will still work exactly as intended in three years – without compromises on business logic, without growing app costs, without vendor lock-in – MedusaJS is the technically more sustainable choice.

The Architecture at a Glance

The core of a MedusaJS project is a clear separation of responsibilities. The MedusaJS backend manages commerce data and logic: products, pricing, inventory, orders, customers. A separate CMS – we frequently use Sanity or Payload – handles the content side: descriptions, campaigns, landing pages, editorial content. The Next.js frontend pulls data from both sources and assembles the storefront the customer sees.

This structure has several concrete advantages. Performance is structurally better than with monolithic systems, because no CMS logic slows down page rendering. Content and commerce can be edited independently – an editor can update a campaign page without a developer needing to deploy anything. And when one part of the system needs to evolve – swapping the CMS, or connecting a new ERP system – the rest remains untouched.

When MedusaJS Is the Right Choice

Whether MedusaJS or an alternative system makes sense can be assessed against a few concrete criteria.

MedusaJS is the right tool when the business model requires individual pricing logic – customer-group-specific B2B pricing, volume-based tiered pricing, or market-dependent price management. Shopify can only represent such structures with considerable app overhead; WooCommerce with plugin combinations that become fragile under load.

MedusaJS makes sense when the shop operates in multiple countries and the requirements around multi-currency, multilingual support, country-specific taxes, and local fulfilment partners are complex. These scenarios are built into MedusaJS modularly from the ground up – not as a retrospective add-on.

MedusaJS is the right architecture when tight integrations with ERP systems, PIM solutions, or WMS platforms are required. APIs are not an extension here – they are the foundation.

MedusaJS is also worth considering when data sovereignty is a requirement. As a self-hostable solution – deployable on Hetzner in Germany, without dependency on US-based platform providers – MedusaJS satisfies DSGVO requirements structurally, not through workarounds.

When Shopify or WooCommerce Is the Better Fit

Fairness is part of how we work. Not every shop needs MedusaJS, and we say so directly.

Shopify is the right choice when time-to-market is the most important variable and the business model has no unusual commerce requirements. A D2C brand with a standardised product range, Stripe payments, and manageable international growth will go live faster with Shopify – at reasonable cost, as long as revenue doesn't reach levels where transaction-based fees become significant.

WooCommerce is the right choice when a WordPress infrastructure already exists and the shop needs to be tightly connected to the CMS – for example, a content-driven shop where product pages are editorially maintained and the CMS is at the centre of operations. For such scenarios, WooCommerce is economically attractive and well-documented.

The limit is reached when customisation requirements exceed what Shopify can deliver without a growing app sprawl, or what WooCommerce can manage without fragile plugin combinations. At that limit, MedusaJS begins to show its advantage.

Practical Implementation: What a Project Involves

A MedusaJS project doesn't begin with technology – it begins with a discovery workshop. We analyse the existing or planned commerce model: what do the product structures look like? What pricing logic applies to which customer groups? Which systems need to be integrated? Where are the drop-off points in the existing checkout? Only once these questions are answered does the technical concept begin.

The implementation follows a modular approach. The MedusaJS backend is set up and configured – product catalogue, pricing rules, promotions, order management, fulfilment logic. Payment integrations with Stripe, Adyen, or Mollie are connected. External systems – PIM, ERP, CRM – are connected via API. The Next.js frontend is developed with SSR, SSG, and ISR depending on page type, and with a clear focus on Core Web Vitals and SEO performance.

After launch, we handle operations and further development: monitoring, security updates, SEO optimisation, performance analysis, new features. A commerce system isn't a project with a sign-off date – it's a platform that grows continuously alongside the business.

Costs and Economics

Migration decisions always come down to numbers as well. A MedusaJS project is more expensive in its initial investment than a Shopify setup – that's an honest statement. Implementing a complete MedusaJS platform typically falls in the range of €40,000 to €120,000, depending on the complexity of integrations, number of markets, and depth of customisations.

What offsets that: Shopify charges transaction-based fees that become significant as revenue grows. Most serious Shopify setups run on multiple paid apps that together quickly add up to €500 to €2,000 per month. MedusaJS has no transaction fees and no licensing costs – only infrastructure and operating costs that are transparent and predictable.

For companies above a certain revenue threshold – roughly from one million euros in annual revenue in the relevant channel – MedusaJS is generally economically equivalent to or cheaper than Shopify over a three-year horizon, with considerably greater flexibility. For smaller projects, the additional complexity often doesn't pay off.

What MedusaJS Doesn't Solve

Headless architectures are not a cure-all, and we say so explicitly. The complexity of a MedusaJS project requires a team that is comfortable with API architectures, Node.js, and modern frontend frameworks. Anyone without that competence in-house or available externally will underestimate the operational burden.

The flexibility MedusaJS offers also means: there are no ready-made answers to standard questions. A Shopify merchant can configure product variants in a few minutes. In MedusaJS, the domain model has to be thought through first. That is the price of flexibility – and in complex scenarios, it is worth paying.