You've identified the problem. You know the industry. You have a list of people who would pay for a solution right now. The question isn't whether to build — it's what to build.
Vertical SaaS and marketplaces solve the same underlying problem from opposite directions. One sells workflow software to businesses. The other connects buyers and sellers and takes a cut of the transaction. Both can work in a tight vertical. The mechanics are completely different.
The difference that actually matters
Vertical SaaS is a software subscription. You build the tools an industry uses to operate — scheduling, dispatch, job costing, compliance tracking, inventory, whatever the workflow requires — and you charge a monthly fee for access. Revenue is predictable. Churn is your enemy. Value compounds as customers get more embedded in your product.
A marketplace charges a fee per transaction facilitated. You connect two sides of a market — a buyer and a seller, a homeowner and a contractor, a fleet manager and a parts supplier — and you take a percentage or a flat fee when a deal happens. Revenue scales with volume. Liquidity is your enemy early. Value compounds as both sides of the network grow.
The same vertical can support both models. HVAC maintenance has vertical SaaS companies (field service software) and marketplaces (on-demand HVAC dispatch platforms). They're different businesses, with different customers and different unit economics, operating in the same industry.
When vertical SaaS wins
Build vertical SaaS when the operators in your industry are already running a defined workflow and they need better tools to execute it. The buyer is clear — it's the business owner or the department head. The pain is operational inefficiency. Customers pay for faster execution, fewer errors, and better visibility into their own operations.
This model works when:
- The workflow is complex enough that a general-purpose tool doesn't fit
- Buyers are concentrated — say, 5,000 HVAC companies in the Southeast, not 5 million homeowners
- Customers have predictable, recurring software budgets
- Value compounds over time through data accumulation and workflow lock-in
Operator founders dominate here because they know the workflow from the inside. They know what the scheduler does at 7am, what breaks during job costing, and what the office manager checks before invoicing. That specific knowledge prevents the classic mistake: software that does the right thing in the wrong order.
When a marketplace wins
Build a marketplace when the core problem is discovery or matching. Two parties want to transact, but they can't find each other efficiently, can't compare reliably, or can't transact without a trusted intermediary. The software you build doesn't run the workflow — it facilitates a connection.
This model works when:
- Both sides of the market are fragmented — many buyers and many sellers
- Transaction frequency is high enough to justify percentage fees
- You can own trust in the middle — vetting, reviews, standards, dispute resolution
- One side is already underserved by the other's existing channels
The challenge is the cold start. A marketplace with no supply is worthless to buyers. A marketplace with no buyers is worthless to suppliers. You have to solve both sides before you have a business. This is harder than SaaS adoption because you can't sign a customer and start collecting MRR — you need both sides to show up simultaneously.
The hybrid trap
Most operator founders don't set out to build a marketplace. They build vertical SaaS, get traction, and then look at the transactions flowing through their software and think: I could take a cut of that. That's when the hybrid trap opens.
A hybrid model — software plus transaction fees — can work. It works at scale, with dedicated product and go-to-market resources for each side of the business. Toast did it. Mindbody did it. But both built the SaaS first, got to significant scale, and then layered payments and marketplace features on top of an established customer base.
The mistake is trying to build both at zero. You end up with SaaS pricing too low because you're subsidizing it with hoped-for transaction revenue that hasn't arrived yet, and marketplace liquidity that never materializes because you don't have the volume to make either side trust you.
The unit economics tell you what's true
Vertical SaaS unit economics are predictable from the start. You know your ACV, your churn rate, and your CAC. The math is legible. Investors understand it. Customers budget for it.
Marketplace unit economics are back-loaded. Your gross merchandise volume determines your revenue, and GMV only grows when both sides are active. The model produces high revenue at scale but requires a longer runway to prove itself. Early metrics — sign-ups, listings, matches — can look healthy before the fundamental marketplace question (do transactions close?) gets answered.
For most operator founders evaluating which model to start with, vertical SaaS is the faster path to validation. You can call five people from your industry, demo a working prototype, and get a letter of intent. The marketplace question can stay open. Build the software first, get paying customers, and let the transaction layer develop from a position where you already have both sides of the market using your product.
How to decide
The fastest way to choose is to look at your existing contacts. If your list is full of businesses — operators, owners, department heads — build SaaS. If it contains both sides of a transaction that currently struggle to find each other, a marketplace may fit better.
A second test: where does value accumulate? If users get smarter, faster, and more embedded the longer they use your product, that's SaaS. If the platform gets more valuable as more participants join, that's a marketplace.
A third test: what can you close in 90 days? SaaS is typically faster to first revenue in a tight vertical. If product-market fit in 6 months is the goal, build the tool your contacts will pay for, not the platform that requires two-sided liquidity.
For most operators, the answer is vertical SaaS. You have the domain knowledge, the contact list, and the workflow understanding to build something people will pay for quickly. If you have a clear thesis on which model fits your vertical and you're looking for a co-builder with the infrastructure to ship fast, tell us what you're building.