Vertical SaaS
TLDR
SaaS products built for a single industry instead of a horizontal function.
Definition
Vertical SaaS is software designed end-to-end for the workflows of one industry: restaurants, construction, accounting, logistics, healthcare. It typically replaces several horizontal tools (CRM, inventory, scheduling, billing) with an integrated product that understands the industry's domain model.
Why it matters
Vertical SaaS defends against commoditization because the domain knowledge embedded in the product is hard to replicate. It also expands the total addressable market per customer because the vendor can sell more workflows to the same buyer. Belgian examples include Deliverect (restaurants), Silverfin (accounting firms), and Accountable (freelancers and small businesses).
Mechanism
Expansion revenue from a vertical SaaS customer often exceeds initial contract value within three years because the vendor layers payments, analytics, and compliance modules on top of the core workflow. This creates a platform dynamic without the investment required to build a horizontal platform.