The received wisdom says horizontal SaaS has better unit economics than vertical SaaS because horizontal markets are larger, allowing better scale in infrastructure, support, and development. In practice, the gross margin comparison often favors vertical SaaS — and understanding why reveals important lessons about how value gets priced and captured.

Why vertical SaaS tends toward higher gross margins:

Pricing power from specialization. Vertical SaaS buyers expect to pay more for domain-specific software than for generic alternatives. A construction project management platform that integrates with the industry's standard cost codes, compliance databases, and subcontractor networks commands a price premium that generic project management software can't justify. That premium flows to margin.

Lower support costs per customer. A vertical SaaS company with customers who are all in the same industry, using the product for the same workflows, generates far fewer unique support issues than a horizontal platform supporting a thousand different use cases. The support team builds deep expertise in a narrow problem set. Efficiency is structural.

Efficient AI feature development. Training AI on a specific vertical's workflow data produces models that are more accurate with less compute than general models, because the problem space is narrower. The AI features cost less to build and operate, and charge more because they're more valuable. Both improve margin.

Partnership leverage with vertical-specific integrations. Vertical SaaS companies often develop partnerships with the 3-5 integration partners that matter in their vertical. These partnerships generate referrals, reduce CAC, and improve customer success outcomes — all of which improve net margin even when not directly captured in gross margin.

The highest-margin SaaS businesses in the next five years will be vertical specialists with pricing power, efficient support models, and data moats that justify premium pricing.

Vertical SaaS isn't a concession on market size. It's a choice for margin quality.