iPaaS vs middleware vs integration platform: what is the difference?
Your ERP needs to talk to your webshop. Your inventory needs to be correct across ten retailers at the same time. Orders need to automatically land with the right supplier. So you start looking for “an integration” and within five minutes you are in a forest of terms: middleware, iPaaS, integration platform, API layer, connector.
Software providers often use those words interchangeably. That is confusing, because they are three different solutions with a different price tag, a different implementation time and a different type of company that benefits from them most.
In this article, we explain the difference clearly, with a comparison table and a decision guide. And we show why many brands, suppliers and retailers do not actually need an integration tool, but a network.
The short answer
Middleware is software that sits between your own systems and enables them to communicate with each other. It often runs on-premise and is usually built and maintained by an in-house IT team.
iPaaS (Integration Platform as a Service) is middleware as a cloud service. You get ready-made connectors and tools to build integrations between applications yourself, without your own servers.
An integration platform is the umbrella term for any environment that connects systems. In practice, it often refers to a vertical platform: a solution built for one sector in which both the integrations and the trading partners are already in place. Droppery is such a vertical B2B integration platform for commerce.
In short: middleware and iPaaS give you the toolbox. A vertical integration platform gives you the working result.
Why these terms are so often used interchangeably
The confusion is logical. All three solve the same basic problem: systems that do not communicate with each other automatically. And technically, iPaaS is also a form of middleware, and every iPaaS is also an integration platform.
The difference lies in three questions:
- Where does it run? On your own servers or in the cloud?
- Who builds the integrations? Your developers, you with a visual tool, or the provider?
- What is already included? Only technology, or also the parties you do business with?
Anyone who answers those three questions knows exactly what type of solution they are looking at.
What is middleware?
Middleware is the oldest of the three. It is a software layer that sits between applications and translates and forwards messages, data and commands between those applications. Think of message brokers, an Enterprise Service Bus (ESB) or custom API layers.
Middleware is traditionally installed on-premise, meaning on the company’s own servers. Every new integration is a project: a developer writes the logic, tests it and maintains it afterwards. If the ERP or webshop changes, the integration has to change with it.
Strong in: complex internal environments with legacy software, strict requirements around where data is stored, and an in-house IT department.
Less strong in: speed, scalability and integrations with external parties. If you want to connect ten retailers, in practice you build something similar ten times.
What is iPaaS?
iPaaS stands for Integration Platform as a Service. Gartner describes it as a provider-managed cloud service that enables users to build integrations between applications, services and data sources, both inside and outside their own organisation.
In plain language: iPaaS is middleware that you purchase as a subscription. You get a library of connectors (for example for Salesforce, HubSpot, Exact or Shopify), a visual environment for building flows, and monitoring. Well-known names include MuleSoft, Boomi and Workato. Tools such as Zapier and Make sit on the lighter end of the same category.
Strong in: connecting many different SaaS tools within one organisation, without your own servers. Scalable and faster than traditional middleware.
Less strong in: anything sector-specific. An iPaaS does not know what a dropship order is, how a supplier wants to display inventory per retailer, or which product fields Shopware requires. You still build that logic yourself. And the parties you want to connect with, you still need to find and convince yourself.
Want to dive deeper into the rise of iPaaS in e-commerce? Also read our article What is iPaaS and why is it growing so fast in ecommerce?
What is an integration platform?
“Integration platform” is the broadest term. Strictly speaking, it includes anything that connects systems. In the market, the distinction is usually made as follows:
Horizontal integration platforms work for every sector and every process. These are essentially the iPaaS solutions above.
Vertical integration platforms are built for one sector and one set of processes. They know the data, the standards and the parties in that market. The integrations are not a construction kit but a product that already works.
Droppery is a vertical integration platform for B2B commerce. Brands and suppliers connect their ERP or inventory system once via the supplier integrations. Retailers connect their webshop once via the webshop integrations, including Shopify, WooCommerce, Lightspeed, Magento, Shopware and PrestaShop. From that moment on, product data, inventory, prices and orders flow automatically between all parties that work together.
Strong in: speed, a low technical threshold and access to an existing network of trading partners.
Less strong in: processes outside the sector. If you want to connect your HR system to your CRM, a vertical commerce platform is not intended for that..
iPaaS vs middleware vs integration platform: the comparison
| Middleware | iPaaS | Vertical integration platform | |
|---|---|---|---|
| Where does it run? | Often on-premise | Cloud (SaaS) | Cloud (SaaS) |
| Who builds the integrations? | Your IT team | You, with connectors | The provider |
| Time to go live | Months | Weeks | Often days |
| Developers needed? | Yes, many | Partly | Hardly |
| Trading partners included? | No | No | Yes, in the network |
| Costs | High upfront costs plus maintenance | Subscription plus build time | Subscription, little build time |
| Ideal for | Legacy environments | Broad internal business processes | Brands, suppliers and retailers |
The difference almost nobody mentions: integrations are not your biggest problem
This is where things often go wrong in practice. A brand wants to sell more online through retailers and thinks: we need a better integration. So an iPaaS is purchased or a developer is hired. Six months later, there is a beautiful technical integration, and still not a single new retailer has been connected.
Because the real bottleneck was never the API. It was the question: who are you actually connecting with?
Middleware and iPaaS connect systems. A vertical integration platform connects companies. That is a fundamentally different product.
At Droppery, we see this every day. A supplier that connects once not only gets a working data flow, but also access to retailers in the Netherlands, Belgium, Germany and France that are actively looking for new brands. Via Droppery Selective, the supplier decides which retailers it works with and under what conditions. And a retailer that connects its webshop can use Droppery for retailers to request collaborations with brands directly, without building a separate integration for every brand.
That is the difference between buying a telephone cable and getting a phone book in which everyone already answers.
How it works in practice
Suppose a furniture brand wants to sell its collection through twenty webshops.
With middleware, the IT team builds an integration per webshop, or a generic feed that each webshop then has to work with itself. Inventory differences and manual order entry remain for every retailer that is not properly connected.
With an iPaaS, building goes faster, but the brand still has to make agreements with each retailer, map fields, align order statuses and handle exceptions. And it still has to find those twenty webshops itself first.
With a vertical integration platform, the brand connects once. Product data is enriched via the Droppery PIM solution and sent to each webshop in the correct format. Inventory synchronises automatically. Orders automatically enter the brand’s own system, including track & trace back to the retailer.
You can see that this works at De Eekhoorn/WOOOD: after the connection with Droppery, processing time fell by 22%, there were 97% fewer errors and orders are processed on the same day. And Eddy Roothaert, CEO of Bazar Bizar, puts it this way: “Thanks to the guidance and support from Droppery, we have increased our global online sales by over 82% compared to last year.”
Which one do you need?
Choose middleware if you mainly connect internal systems, run a lot of legacy software on-premise and have your own IT team that wants to manage integrations.
Choose an iPaaS if you want to connect dozens of SaaS tools within your organisation, from marketing to finance, and you have the capacity to build and maintain flows yourself.
Choose a vertical integration platform if you want to exchange products, inventory and orders with external trading partners, such as brands with retailers or suppliers with webshops. Especially if you want to grow quickly without your own developers.
Many companies ultimately use a combination: an iPaaS or middleware for internal processes, and a vertical platform such as Droppery for the trading flow with partners. The two do not conflict; they complement each other.
Five questions to ask before you choose
- Do I want to connect systems or companies? Is it about your own stack or partners outside your organisation?
- Who is going to maintain it? Every self-built integration is an ongoing obligation, even after going live.
- How quickly does it need to go live? Months of building means months of revenue you miss out on.
- Does the solution know my sector? Does the platform know what a dropship order, an EAN or a supplier-specific margin is?
- What happens when I grow? Does retailer number fifty require as much effort as retailer number one?
Still unsure which solution fits your stack? Also see our overview of the best B2B commerce platforms in 2026.
Frequently asked questions
What is the difference between iPaaS and middleware?
Middleware is software that connects systems and often runs on-premise, with your own team building the integrations. iPaaS is middleware as a cloud service: the provider manages the infrastructure and you build integrations with ready-made connectors. As a result, iPaaS is faster and more scalable, but you still build the logic yourself.
Is iPaaS the same as an integration platform?
Not quite. Every iPaaS is an integration platform, but not every integration platform is an iPaaS. An iPaaS is horizontal and works for every sector. A vertical integration platform, such as Droppery for B2B commerce, is built for one sector and provides working integrations plus a network of trading partners.
What is a vertical integration platform?
A vertical integration platform is an integration solution developed for one specific sector. It knows the data standards, processes and parties in that market. As a result, you do not have to build integrations yourself, but connect to something that already works.
Do I need an iPaaS as a webshop?
Usually not for your product assortment. If you want to sell products from brands and suppliers with automatic inventory and order synchronisation, a vertical platform such as Droppery is faster and cheaper. An iPaaS is mainly useful if you want to connect many internal tools with each other.
Can Droppery work with my existing ERP or iPaaS?
Yes. Droppery connects with suppliers’ ERP and inventory systems via the supplier integrations and via API. Companies that already use an iPaaS or middleware internally can use Droppery alongside it for the trading flow with retailers or brands.
Which webshop platforms does Droppery support?
Droppery has integrations with Shopify, WooCommerce, Lightspeed, Magento, Shopware and PrestaShop, among others, plus an API for custom webshops. The full overview is available on the webshop integrations page.
How quickly can you go live with a vertical integration platform?
Because the integrations already exist, retailers and suppliers are often operational within a few days. With middleware or iPaaS, you should expect weeks to months of build time per integration.
Conclusion: choose based on your goal, not the buzzword
Middleware, iPaaS and integration platform are not synonyms. Middleware is the traditional building layer for internal systems. iPaaS is the flexible cloud version of it. And a vertical integration platform is the shortest route if your goal is to trade with other companies.
For brands, suppliers and retailers in e-commerce, this applies: it is rarely about the integration itself, but about what lies behind it. Which partners, which data, which speed.
Want to see how Droppery connects both your systems and your trading partners? Book an online demo or get started right away.
About Droppery
Droppery is Europe’s B2B dropshipping and integration platform, founded in Amsterdam in 2021. The platform connects brands, suppliers and retailers and automates product data, inventory, orders, integrations and logistics from one environment. Droppery is active in the Netherlands, Belgium, Germany and France and works with brands such as De Eekhoorn/WOOOD, Bazar Bizar, PTMD, J-Line, Actona Group and Nijwie. Want to know more? Read about Droppery, view our partners or contact us at info@droppery.io or +31 20 210 1895.