There is a correct default in 2026 and it is SaaS. Accounting, CRM, email, video calls, document storage — commodity functions with commodity needs. Do not build custom for any of these. Pay the subscription and move on.
But there is a category where SaaS loses, and most mid-size businesses are running their core operations on SaaS tools that do not fit because nobody told them they had a choice. The category is the workflows that are specific to how your business actually works.
Here is the test. If every business in your industry does this exact thing the same way, it is a commodity workflow, buy SaaS. If your business does it in a way that is different from your competitors — and that difference is part of why you are better — it is a core workflow, and SaaS will hold you back.
We wrote about the trigger signals in when off-the-shelf software stops fitting. The short version: workarounds piling up, multiple SaaS tools that should be one, paying for seats you do not use, exporting data to spreadsheets because the SaaS report does not cover your case. Each of these is a small tax, and they add up.
The misconception about custom software is that it is more expensive than SaaS. In the short term, yes. In the long run, for the right workflow, it flips. SaaS pricing is set to cover the vendor's R&D for features you do not use. You are subsidising everyone else's use case. Custom software is priced for yours. The longer the horizon and the more specific the workflow, the more custom wins.
The other misconception is that custom is expensive to maintain. It can be, if you build it wrong. Our posts on why we ship boring code and how to scope a build without it blowing up cover the right approach. A custom app that is 3,000 to 15,000 lines of focused code doing one thing well is cheap to maintain. The failure mode is trying to build a platform.
The businesses that get this right have a portfolio. SaaS for the commodity 80 percent. Custom for the specific 20 percent that is core to their advantage. The custom is where the operational leverage lives, and every year it compounds. Competitors running on generic SaaS cannot match the process efficiency of a business with software built for its actual workflow.