If you know an industry well enough to be its software, the hard question is not whether to launch a vertical SaaS but whether to build the platform or run on one. The answer has changed now that agent-native platforms exist.
What "build" really costs
Building the platform yourself is mostly undifferentiated work: multi-tenancy, isolation, authentication, billing, permissions, an extension model, and the integrations every SaaS needs, before you write a single feature your customers care about. Then you maintain all of it, forever. For most teams this is years and a large engineering payroll spent on plumbing, not on the category you actually understand.
What "buy" gives you
Running on an existing platform means you inherit the plumbing, multi-tenancy, isolation, billing, a marketplace of modules, and, if it is agent-native, agents your customers connect over an open protocol. You bring your brand, your domains, your pricing, and your own AI and payment keys, and you focus on your customers and your category. The differentiator is your industry knowledge, not your scaffolding.
The agent-native difference
A few years ago "buy" meant a rigid white-label that limited what you could offer. An agent-native platform changes that: your customers get software that does the work, not just stores it, and the platform extends through a marketplace, so you are not boxed in. You get the speed of buying with room to differentiate.
How to decide
Build if the platform itself is your product and your edge is platform engineering. Buy if your edge is a deep understanding of an industry and you want to reach customers this year, not after a multi-year build. For almost everyone in the second camp, and that is most vertical-SaaS founders, buying the platform and bringing the domain expertise is the faster, leaner path.
What it looks like on SOIS
You launch a branded, isolated network: your brand and domains, your pricing, your keys, each customer fully isolated, with zero per-network engineering. See SOIS for enterprise for how networks work, the vertical SaaS primer for the model, or talk to us about your category.