MedusaJS and Saleor are the two leading open-source headless commerce platforms, and both are legitimate alternatives to proprietary solutions like Shopify Plus or commercetools. But they take fundamentally different architectural approaches, target different developer profiles, and suit different project requirements. This comparison breaks down the differences that actually matter when you are choosing between them for a production storefront.
Architecture and Technology Stack
MedusaJS is built on Node.js with TypeScript, uses a modular architecture where every piece of commerce functionality (products, carts, orders, payments) is a self-contained module. The data layer defaults to PostgreSQL with MikroORM. MedusaJS 2.x introduced a module-based architecture where each domain is isolated behind well-defined interfaces, making it possible to swap implementations — for example, replacing the built-in inventory module with a custom one that talks to your warehouse management system.
Saleor is built on Python with Django and uses GraphQL as its primary API layer. It stores data in PostgreSQL and uses Redis for caching and Celery for background task processing. Saleor's architecture is more monolithic than Medusa's — the commerce logic is tightly integrated within the Django application, though the plugin system allows extension at defined hook points. Saleor also provides a hosted cloud option with managed infrastructure, which Medusa does not.
API Design: REST vs GraphQL
This is one of the sharpest differences between the two platforms:
- MedusaJS — REST-first: Medusa exposes a comprehensive REST API with clearly documented endpoints. This makes it immediately accessible to any front-end developer who has worked with REST APIs. The JS SDK provides typed client methods that mirror the API surface. For teams that do not need the flexibility of GraphQL, REST reduces complexity and tooling overhead.
- Saleor — GraphQL-first: Saleor's entire API is GraphQL, including the storefront API and the dashboard API. This allows front-end teams to request exactly the data they need in a single query, avoiding over-fetching. However, it requires the team to be comfortable with GraphQL tooling (Apollo Client, code generation, fragment management).
Neither approach is objectively better. GraphQL shines when you have complex product data with many relationships (variants, attributes, categories, channels) and want to minimise network round trips. REST is simpler to cache at the CDN layer and easier to debug with standard HTTP tooling. Choose based on your team's existing expertise and your storefront's data complexity.
Extensibility and Customisation
Medusa's module architecture is its greatest strength for customisation. You can create custom modules that add entirely new domain concepts — subscriptions, rentals, B2B pricing rules — and wire them into the core workflow engine alongside built-in modules. Subscribers (event handlers) and scheduled jobs extend behaviour without modifying core code. The workflow engine allows you to compose multi-step operations (like a custom checkout flow) as orchestrated sequences of steps with automatic rollback.
Saleor's extension model relies on webhooks and a plugin system. Webhooks fire on key commerce events (order created, payment captured, product updated) and your external service can respond synchronously to modify behaviour. The plugin system lets you hook into the request lifecycle at predefined points. This is powerful but less granular than Medusa's module system — you cannot replace core domain logic as easily, only extend it at the designated hook points.
Multi-Channel, Multi-Currency, and Internationalisation
Both platforms handle internationalised commerce, but their approaches differ:
- Saleor channels: Saleor's channel system is mature and well-designed. Each channel represents a distinct storefront with its own currency, pricing, product availability, and shipping configuration. A single Saleor instance can power a UK GBP storefront, a German EUR storefront, and a US USD storefront with different product catalogues and prices per channel.
- MedusaJS regions and sales channels: Medusa uses regions (which define currency, tax rates, and payment/shipping providers) and sales channels (which control product visibility). The combination achieves similar outcomes to Saleor's channels, though the mental model requires understanding both concepts and how they interact.
For merchants operating across multiple European markets with different VAT rates, pricing strategies, and fulfilment networks, both platforms are capable. Saleor's channel abstraction is arguably more intuitive for this use case, while Medusa's separation of concerns gives you finer-grained control.
Making the Right Choice
Choose MedusaJS if your team is JavaScript/TypeScript-native, you need deep customisation of core commerce logic, and you want to self-host with full control over the infrastructure. Choose Saleor if your team prefers Python, you want a mature GraphQL API, or you would benefit from Saleor's managed cloud hosting to reduce operational burden. Both are production-ready and actively maintained with strong communities.
Born Digital has built headless commerce storefronts on both MedusaJS and Saleor, and we can advise on which platform best fits your specific requirements — product complexity, team skills, integration landscape, and scaling trajectory. Reach out for a technical consultation to evaluate both options against your roadmap.