SaaS vs. Custom System: When Does Building Your Own Make Sense

The Default Rule: Buy Before You Build

Let's start with an honest answer: most companies should use SaaS tools rather than build their own. Jira, HubSpot, Shopify, Notion — these are products built by hundreds of engineers over years. You won't outbuild them.

But there are exceptions. And they matter.

When SaaS Works Perfectly

- Standardised processes: e-commerce, project management, CRM, accounting

- Fast start: days, not months

- Small teams: per-user pricing is reasonable

- When your business process fits the tool's logic

When Custom Makes Sense

1. Your Process Is Your Advantage

If your business logic is a unique competitive advantage — you can't put it into a standard tool without losing that advantage. A logistics algorithm, a pricing model, a unique workflow type.

2. Integration Costs Exceed Build Costs

We had a client with 4 SaaS tools that needed to talk to each other. Integration maintenance cost ~€2,000/month. A custom system with all features: €35,000 once. Break-even: 18 months.

3. Licence Costs Become Unreasonable

100 users × €80/month = €8,000/month = €96,000/year. A custom system often costs less than two years of licences.

4. Data Control and Security

When data is your core asset or is regulated (finance, healthcare, defence) — you don't want it on third-party servers you can't audit.

The Hybrid Approach (Often Best)

Use SaaS where it's strong, custom where you're unique:

- Accounting: SaaS (no competitive advantage here)

- CRM: SaaS + custom integrations

- Core product: custom — this is where your value lives

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