Your CRM needs the website’s leads, the ERP needs the store’s orders, accounting needs the invoices. To connect these tools, two approaches compete: an iPaaS (Zapier, Make, n8n, Workato…) or custom development. This iPaaS vs custom development comparison helps you choose based on your flows, volumes and budget.
What is an iPaaS?
An iPaaS (Integration Platform as a Service) is an online platform that connects applications through ready-made connectors. You build visual scenarios: “when a form is submitted, create a CRM contact and notify the team”. No code, set up in hours.
iPaaS vs custom development: the comparison
Speed of setup
A clear win for iPaaS on simple flows between popular tools. Custom development needs scoping and a few days or weeks of work.
Cost over time
An iPaaS is usually billed by operation volume. Cheap at first, it can become expensive as volumes grow or scenarios multiply. Custom development costs more up front, but running costs stay stable whatever the volume.
Reliability and error handling
This is often where it is decided. An iPaaS scenario that fails silently can leave orders untransmitted for days. A custom integration includes automatic retries, detailed logs and alerts, and is tested like the rest of the code.
Business logic
As soon as a flow involves complex rules — pricing, B2B conditions, matching, data transformations — visual scenarios become hard to read and maintain. Code stays readable, versioned and documented.
Dependency and data
With an iPaaS, your flows and some of your data pass through a third-party platform. With custom development, the integration runs on your infrastructure, in Europe if needed.
When to choose an iPaaS
- Few, simple flows: notifications, contact creation, exports
- Modest volumes
- Testing a process quickly before industrialising it
- A team with no development resource
When to choose custom development
- Critical flows: orders, stock, invoicing, payments
- Large or fast-growing volumes
- Specific business rules and data transformations
- Need for traceability, error recovery and security
That is typically the case when syncing a CRM with an ERP — see CRM integration: quotes, orders and invoices cannot get lost on the way. Our Symfony agency builds this kind of critical integration.
An iPaaS connects tools. A shared architecture makes them speak the same language.
The third option: a shared database
The best integration is sometimes the one you do not need. When your ERP, CRM and website share one database, there is no sync to maintain: an order entered is instantly visible everywhere. It is the principle we apply in our projects, described in one PostgreSQL schema for the site, ERP, CRM and AI.
iPaaS vs custom development: FAQ
Zapier, Make or n8n?
Zapier is simplest, Make offers richer scenarios, n8n can be self-hosted. For critical flows, none replaces a monitored custom integration.
Can we move from an iPaaS to custom later?
Yes — validating a flow with an iPaaS, then rebuilding it when it becomes critical, is a sound strategy.
Our recommendation
Start with an iPaaS to validate a simple flow; move to custom development as soon as the flow becomes critical, high-volume or complex. And if you are building new tools, think shared database rather than connectors. To find the right approach for your tools, take the 2-minute audit or book a 30-minute call. Still unsure about the tool itself? Read build or buy software.