ServiceTitan is built for large HVAC, plumbing, and electrical companies and is genuinely powerful at that scale: dispatch boards, call-center workflows, multi-location management, and deep reporting. At forty trucks with dispatchers, it is the right answer.
Plumline is built around one number most contractors cannot state: what one hour of their own crew actually costs, once labor burden, the truck, the equipment, and overhead are all divided across the hours that are genuinely billable. The Cost Engine computes it from the operator's own figures, every service price derives from it, and the quote screen shows the resulting margin before the quote is sent.
The rest of the category is very good at recording a price the operator already chose. Plumline's claim is narrower and different: it tells the operator whether that price was right, then checks the answer against the crew's real measured time on the job.
At one to five trucks it is far more system than the problem requires. Pricing is quote-based rather than published, implementation runs weeks, and annual contracts are standard.
ServiceTitan is correct at forty trucks. At three, an operator pays for a hundred features he will never open. Plumline publishes its price, sets up the same day, and has no annual contract.
Worth stating plainly, because it is true of every comparison on this site. ServiceTitan has years of production hardening and a large customer base; Plumline is early. The accounting integration ecosystem, QuickBooks in particular, is thinner. Support is founder-led rather than a staffed organization. An operator asking "who else uses this" deserves the honest answer, which today is that he would be early.