What Is Vertical SaaS? The Software Category Quietly Outgrowing Everything Else

 


Ask someone to name a SaaS company and they'll probably say Slack, Salesforce, or Notion tools built to work for almost any business, in almost any industry. That category, known as horizontal SaaS, is what most people picture when they hear "software as a service." But the fastest-growing part of the SaaS market isn't horizontal at all. It's vertical SaaS, and it's a shift already visible across the UK startup ecosystem, where a growing share of funded software companies are built around one specific industry rather than a generic tool for every business.

The Basic Difference

Horizontal SaaS solves a problem that looks roughly the same across every industry communication, project management, customer relationship tracking. A bakery and an investment bank can both run on Slack for messaging or Notion for documentation, because the underlying problem those tools solve doesn't really change based on what the business does.

Vertical SaaS takes the opposite approach: it solves a problem specific to one industry, built around that industry's actual workflows, terminology, and regulatory requirements rather than a generic version of the problem. Procore, built specifically for construction project management, is a commonly cited example it doesn't try to be a project management tool for every business, it tries to be the best possible tool for how construction projects actually get run, with all the scheduling, compliance, and subcontractor complexity that entails. Toast does the same for restaurants, and Veeva does it for pharmaceutical and life sciences companies, each one owning the specific operational language of its industry rather than offering a generic layer that industry has to adapt itself to.

Why It's Growing Faster Than Horizontal SaaS

The core reason vertical SaaS is expanding faster than the broader software market comes down to depth versus breadth. A horizontal tool has to stay general enough to serve every customer, which means it can never fully solve the specific, often messy operational problems unique to one industry the compliance quirks of healthcare, the subcontractor chains in construction, the regulatory reporting in financial services. A vertical tool can go all the way into that specificity, because it isn't trying to serve anyone outside that industry.

That depth translates directly into stickiness. When a piece of software is built around an industry's actual workflow rather than a generic approximation of it, switching away becomes considerably more disruptive the tool isn't just storing data, it's embedded in how the business actually operates day to day. Market forecasts reflect that difference: the global vertical SaaS market was valued at roughly $106.5 billion in 2024 and is projected to grow to more than $369 billion by 2033, a substantially faster growth trajectory than the broader, more mature horizontal SaaS category is currently posting.

Where the Momentum Is Actually Concentrated

Growth within vertical SaaS isn't evenly spread either. The fastest expansion is currently coming from analog-heavy industries healthcare, agriculture, and construction among them sectors that have historically lagged in software adoption and are now rapidly digitising, creating a large, underserved base of potential customers for a well-targeted vertical product. Embedded fintech has also become a defining feature of the category: many vertical SaaS platforms now bundle payments, lending, or insurance directly into their industry-specific workflow, turning what started as a single software subscription into a broader financial relationship with the customer and a meaningfully stickier one.

There's also a consolidation trend worth noting. Established vertical SaaS vendors increasingly grow by acquiring complementary tools within the same industry, deepening their grip on a customer's entire workflow rather than simply adding new customers in adjacent verticals. It's a strategy that only really works once a company has already achieved genuine depth in one industry which is, in a sense, the whole point of building vertical in the first place.

Why This Matters for Founders Deciding What to Build

For founders weighing horizontal versus vertical as a starting point, the trade-off is fairly direct. Horizontal products have a larger addressable market on paper, but face intense competition from established generalist players and typically extract less revenue per customer. Vertical products serve a narrower market but can charge meaningfully more per customer, retain them longer, and build a defensible position specific competitors can't easily replicate without the same depth of industry knowledge. For early-stage founders choosing where to focus, the current market data suggests that betting on depth within one industry, rather than breadth across all of them, is increasingly where the strongest growth and retention numbers are actually showing up.

The Bottom Line

Vertical SaaS isn't a niche corner of the software market anymore it's arguably where the software market's most durable growth is currently concentrated. Understanding the distinction between horizontal and vertical isn't just useful vocabulary; for a founder deciding what to build, it's one of the more consequential early decisions shaping how defensible, and how valuable, the resulting business eventually becomes.

I came across this breakdown while reading a piece in the Entrepreneur Plus UK , which laid out clearly why vertical SaaS has been outpacing its horizontal counterpart by such a wide margin.

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