Build vs. Buy Software: Custom App or SaaS?

Build-versus-buy software framework showing when to buy a mature platform or build a focused workflow, with the principle: own what differentiates your business and rent the rest.
For decades, “don’t reinvent the wheel” has been good advice in software. Why build something that already exists? Buy the software, subscribe to the service, and let a vendor spread the cost of developing and maintaining it across thousands of customers.
That logic helped create the SaaS economy. And for the most part, it still makes sense. But AI is changing one side of the equation: what software costs to create. That makes an old question worth asking again.
Maybe, sometimes, you should reinvent the wheel.







