Custom Software vs SaaS

We build custom software, so take this with the appropriate grain of salt — but the honest answer to “should I buy a SaaS tool or build custom software” is that most businesses should start with SaaS, and a specific, recognizable set of businesses eventually outgrow it. Knowing which one you are saves real money either way.

When SaaS is genuinely the right call

For most of what a business needs — accounting, CRM, project management, email — a mature SaaS product has had years of refinement, dedicated support, and a price that reflects shared cost across thousands of customers. Building a custom version of any of these is almost always a mistake: you’d be re-solving problems the SaaS vendor already solved, at a fraction of their budget and none of their ongoing maintenance capacity.

SaaS is the right call when:

• Your workflow is close to how most businesses in your category already operate — you’re not fighting the tool’s assumptions.
• The functionality is genuinely a solved, competitive market (accounting, scheduling, basic CRM).
• You need it running now, not in three months.
• Your differentiation as a business has nothing to do with this particular workflow.

When SaaS starts costing you more than it looks like

The costs that make custom software the better call rarely show up as a line-item price comparison — they show up as compounding friction:

You’re customizing around the tool’s limitations, not the other way around — renaming fields, inventing workarounds for a workflow the SaaS product doesn’t support, or running a second spreadsheet next to it to track what it can’t.

Per-seat pricing scales worse than your headcount does. A tool priced per user looks reasonable at 5 people and becomes a serious line item at 50, with no corresponding increase in value delivered per seat.

The workflow is your competitive advantage, and a generic tool can’t express what makes it different. If how you handle a specific process is genuinely part of why customers choose you, a SaaS tool built for the average business in your category will always constrain that, not support it.

You need to combine functionality that no single SaaS tool provides, and you’re stitching together three or four tools with brittle integrations (often manual, often break) to approximate what one purpose-built system would do natively.

Data ownership or integration depth actually matters to your business, and you’re limited by what the SaaS vendor’s API allows rather than what your business logic requires.

The tell isn’t “we’re spending a lot on SaaS.” It’s “we’re spending a lot of time working around SaaS.” The first is a budget line; the second is a growing tax on every process that touches the tool.

A practical way to decide

Rather than treating this as an ideological choice, map your actual workflow against the SaaS tool’s assumptions. If the tool fits your process with minor configuration, buy it — building the same thing yourself would just be reinventing a solved problem slower and worse. If you’re maintaining workarounds, exporting to spreadsheets to do the part the tool can’t, or paying rapidly scaling per-seat costs for functionality that doesn’t scale with your team’s actual value delivered, that’s the signal to scope a custom alternative — and often not a full replacement, just the specific workflow that’s actually broken.

It’s also rarely all-or-nothing. Plenty of businesses run SaaS for the solved problems (accounting, basic CRM) and custom software for the one or two workflows that are genuinely core to how they operate — which is the pattern we see most often in practice.

Trying to figure out which side of that line your business is on for a specific workflow? Our custom software page covers how we scope that conversation, and we’ll tell you honestly if a SaaS tool is still the better answer.