Custom Software vs. SaaS: When Each One Actually Wins

At some point, every growing business has the same conversation. Someone on the team says "we should just get a tool for that," and someone else says "no tool does exactly what we need." Both are right. That's the problem.

We get asked about this constantly, usually by people who've already tried three SaaS tools, stitched them together with Zapier, and are now paying for five subscriptions to do the job of one system that still doesn't quite fit. So let's actually answer it, without the sales pitch.

SaaS wins when the problem is common

If what you're solving is something thousands of other companies also solve — invoicing, CRM, email marketing, project tracking — someone has already built it better than you could, and they've spent years refining it. Buying that is smart. You're not going to out-engineer Stripe's checkout flow or HubSpot's email builder, and you shouldn't try.

SaaS is also the right call when you're early and still figuring out your process. Paying €50/month to test an idea is a much better bet than commissioning software for a workflow that might not exist in six months.

Custom software wins when the process is the business

Here's the pattern we see over and over: a company grows past the point where generic tools fit. Not because the tools are bad, but because the business stopped being generic. You've got a pricing logic nobody else has, an operations flow shaped by years of real-world edge cases, or three systems that need to talk to each other and don't.

At that point, every SaaS tool starts asking you to bend your business to fit its workflow. You end up with workarounds, spreadsheets patching the gaps, and someone on your team whose real job is "manually copying data between systems."

That's the tell. When the workaround becomes a job, the tool has stopped being cheap.

The real question isn't "which is better"

It's: is this process a commodity, or is it your edge?

If it's a commodity — accounting, scheduling, basic CRM — rent it. If it's the thing that actually makes your business work the way it works, the thing your competitors can't just copy by signing up for the same tool you use, that's worth owning.

We wrote more about how we approach exactly that kind of project on our custom software page — worth a look if you're past the "maybe a tool will fix this" stage.

A quick gut-check

• Are you paying for 3+ tools trying to make them act like one system? → probably time for custom.
• Is someone on your team doing manual data entry between platforms every week? → probably time for custom.
• Is your process still changing every month? → stick with SaaS a bit longer.
• Is this a genuinely standard business function? → rent it, don't build it.

Neither answer is wrong. The expensive mistake is picking the wrong one for where your business actually is right now.