Platform decisions in commerce engineering rarely look expensive on day one. The licence cost or the open-source tag feels straightforward. What catches teams off guard is everything that accumulat...
Compare TCO for your headless build
Lets TalkLayer 4: Integration and Plugin Development
No platform ships with every integration a business needs. The difference is in how integrations are handled and what they cost.
Shopify Plus has the largest app ecosystem of the three. Most common integrations, including email marketing, ERP connectors, loyalty platforms, and review tools, have ready-made apps available. Many are subscription-based, adding USD 50 to USD 500 per month per app to operational cost. A store using ten such apps adds USD 6,000 to USD 60,000 over three years in app subscriptions alone.
Commercetools has a connector marketplace that is growing but thinner than Shopify's. Custom integrations are common and expensive. A single ERP connector built on Commercetools by an experienced agency often runs USD 15,000 to USD 50,000 in engineering cost.
Medusa.js provides a plugin architecture that allows developers to build, maintain, and share integrations. Community plugins exist for common services including Stripe, PayPal, SendGrid, Algolia, and Contentful. Custom integrations are straightforward to build in-house if engineering capacity exists. When external agency support is needed, integration cost on Medusa.js is typically lower than Commercetools because the codebase is simpler and more accessible to mid-market engineering talent.
Layer 5: Support, Maintenance, and Upgrades
Shopify Plus includes 24/7 priority support within the subscription. Platform upgrades happen automatically. You trade control for convenience: Shopify manages the stack, and merchants work within the constraints of what Shopify exposes.
Commercetools provides SLA-backed support on enterprise contracts. Upgrades to the SaaS API are managed by Commercetools, but custom storefront and integration code requires your team to maintain compatibility with API version changes.
Medusa.js is open-source, which means platform support is community-driven at the free tier. Commercial support options exist through certified partners. Maintenance cost is primarily engineering time: keeping the platform version current, monitoring infrastructure, and handling dependency updates. For a well-structured Medusa.js deployment, maintenance overhead averages three to five engineering days per month at steady state.
The Hidden Cost That Most TCO Models Miss
Every platform comparison eventually collides with a cost that no spreadsheet captures cleanly: the cost of constraint. Shopify Plus is genuinely good at what it does, but it imposes boundaries on checkout customisation, data portability, multi-currency logic, and backend workflow design. When a business grows into requirements that exceed those boundaries, the migration cost is significant. Teams that have done a Shopify Plus to headless migration report three to six months of engineering effort and USD 50,000 to USD 200,000 in transition cost depending on catalogue size and customisation depth.
Medusa.js carries no such ceiling. Because the platform is owned and self-hosted, architectural decisions are yours. The business logic you build today scales without hitting a platform wall.
Commercetools avoids lock-in at the backend level but creates dependency at the contract and cost level. SaaS fees at enterprise scale are significant, and renegotiating or migrating away from Commercetools is not a lightweight exercise.
For a detailed comparison of how Medusa.js performs alongside Shopify Hydrogen and Saleor in production environments, the Askan Tech headless commerce analysis covers real-world build patterns across mid-market and enterprise-scale stores.
Plan your Medusa.js TCO model
Lets TalkBuilding a Realistic 3-Year TCO Model
When building a TCO model for a platform decision, the following cost categories should each have a line item:
Platform licence or SaaS subscription fee
Infrastructure: compute, database, CDN, storage
Initial engineering cost: scoping, architecture, development, testing, launch
Integration development: ERP, CRM, logistics, payment gateways, marketing tools
App and plugin subscriptions (particularly relevant for Shopify Plus)
Ongoing maintenance: version updates, monitoring, dependency management
Support contracts or agency retainer for platform expertise
Training and onboarding for internal teams
Estimated migration cost at the three-year mark if the platform does not scale
When all of these are mapped honestly, Medusa.js typically delivers the lowest three-year TCO for stores with engineering capacity in-house or access to a qualified Medusa.js partner. Shopify Plus wins on speed and simplicity for early-stage merchants. Commercetools justifies its cost at enterprise scale with complex multi-region or multi-channel requirements.
Teams ready to model their specific deployment can start with the Medusa.js documentation for infrastructure sizing guidance.