Product Strategy
When It Makes Sense to Build Custom Software Instead of Buying It
Start with the workaround count
The clearest signal isn't cost or feature gaps on paper — it's how many manual workarounds your team has built around an off-the-shelf tool. Spreadsheets that shadow a CRM, exported CSVs reconciled by hand, Slack threads standing in for an approval workflow. Each workaround is a sign the tool has stopped fitting the process.
One workaround is normal. A stack of them, repeated weekly, is usually a sign that the cost of continuing to bend around a generic tool has quietly exceeded the cost of building something purpose-fit.
Weigh differentiation, not just difficulty
Not every workflow deserves custom software, even if it's painful. The better question is whether the process is a genuine point of differentiation for your business, or simply a commodity function every company in your space handles the same way.
Commodity functions — payroll, basic accounting, standard scheduling — are rarely worth building custom. Processes that reflect how you actually compete are a different story, because a generic tool will always force you toward the industry-average version of that process.
Account for the real cost of ownership
Custom software isn't a one-time cost. It requires ongoing maintenance, security updates, and a plan for who owns it operationally after launch. Factor that into the decision honestly rather than comparing only the upfront build cost against a subscription fee.
That said, the ongoing cost of a poorly-fitting SaaS tool — the workarounds, the manual reconciliation, the opportunity cost of a team's time — is a real cost too. It's just easier to underestimate because it's distributed across many small inefficiencies instead of one line item.