September 17, 2026

Choosing between an existing app (a Shopify app, a SaaS plugin, an off-the-shelf platform) and building something from scratch is one of the most common—and most expensive—decisions a business makes. The right answer is rarely “always custom” or “always buy.” It depends on how unique your process is, how fast you need to ship, and how much control you must keep.

This article breaks down the real differences, the tradeoffs, and a practical way to decide.