Buy vs. Build: When Off-the-Shelf Software Almost Fits

Most businesses shouldn't build custom software, and we'll tell you that directly if that's the honest answer. If a SaaS tool already does 90% of what you need for a fraction of the cost and time, buying it is the right call. The harder decision comes when a tool does 80% of what you need — close enough to almost work, not close enough to actually work.

Where "almost fits" shows up

A few patterns tend to signal the gap is worth closing:

• Workarounds have become part of the process. Your team exports data from one tool, edits it, and re-imports it into another, every week, because neither tool does what the process actually needs.
• You're paying for features you don't use to get the one you do. Enterprise tiers exist because the vendor built for a market broader than your business.
• The tool doesn't talk to the rest of your stack. No usable API, or an integration that only covers half of what you need connected.
• You've customized around the tool's limits so much that switching tools would be as disruptive as building one.

The real comparison

The right comparison isn't "SaaS subscription cost vs. custom build cost" — it's the ongoing cost of the workaround, indefinitely, versus a one-time cost to remove it. A workaround that costs someone two hours a week doesn't feel expensive in any single week. Multiplied by a few years, it usually costs more than the custom system would have.

That said — if the workaround is occasional and cheap, keep the SaaS tool and move on. Building custom software to solve a minor annoyance is its own kind of expensive mistake.