I want to talk about one decision that quietly shapes your software bill more than which product you pick: how it’s priced. Per seat, or flat per firm. It sounds like an accounting footnote. It isn’t. It’s the difference between software that gets cheaper as you scale and software that taxes you for scaling.
I learned this the expensive way, running my own practice on a stack of per-seat tools, so let me save you some of the tuition.
Why per-seat feels right and ages badly
Per-seat pricing is seductive for a good reason: when it’s just you, it’s usually the lowest number on the page. One user, one modest monthly fee. You feel like you’re only paying for what you use. That instinct is sound — and it’s precisely why the model wins the signup and loses the long game.
The problem is the multiplier. A per-seat tool isn’t really priced at its sticker; it’s priced at sticker × the people you employ. And you almost never run just one per-seat tool. The case system bills per seat. The intake tool bills per seat. The e-sign plan bills per seat. So the moment you hire your first paralegal, you don’t get one small increase — you get several, all at once, on the same payday. Hiring, the thing you actually want to do, becomes the thing that raises your overhead the most.
That’s the part that gets people. They budget for the new salary. They don’t budget for the new salary quietly raising four software bills.
Where the lines cross
Picture two lines on a chart. The flat fee is horizontal — same price at one user, same price at five. The per-seat total is a staircase climbing up and to the right, one step per hire, and steeper than you’d expect because it’s several tools stepping at once.
Those lines cross somewhere. The crossover is the headcount where your stacked-up per-seat bills pass the flat fee. I won’t hand you a fake universal number, because it honestly depends on how many per-seat lines you carry. But I’ll tell you what I’ve seen: the crossover arrives sooner than firms expect — often right around the second or third person — because it isn’t one tool crossing the line, it’s the whole staircase crossing together.
Below the crossover, per-seat genuinely can be cheaper, and if you’re a committed solo who isn’t trying to grow, that might be the right call. Above it, a flat per-firm price wins, and keeps winning by more with every hire, because the flat line just sits there while the staircase keeps climbing.
The costs that never make the invoice
Even when the dollar math is close, two things tip me toward flat pricing, and neither shows up as a line item.
Predictability. With a flat fee I can make a hiring decision without re-running my software budget. The price is the price whether I add one paralegal or four. That certainty has real value when you’re deciding whether you can afford the next person — and per-seat pricing puts a small, recurring thumb on the scale against hiring.
The friction of the stack itself. Per-seat tools tend to be separate tools, which means separate logins, separate bills, separate exports, and the joints between them that you maintain by hand. I once spent four logins and twenty minutes answering a client question that should’ve taken ten seconds, and that time doesn’t appear on any invoice — but it’s a cost, and it’s a cost that scales with headcount too.
How I’d decide
Don’t argue the models in the abstract. Do the arithmetic on your firm. List your per-seat tools, multiply each by your real headcount, add the flat-billed ones, and compare that total to a single per-firm price for the same job. Then ask the question that actually matters: not “which is cheaper this month,” but “which is cheaper at the firm I’m trying to build.” If you intend to grow, the staircase is working against you, and you’ll usually want to step off it before the crossover, not after.
That comparison is exactly what the cost calculator runs — it multiplies your per-seat lines by your seat count and puts the staircase and the flat line side by side, so you can see your own crossover instead of guessing at it.