Here is a diagnostic you can run on your own marketing in the next ten seconds, without hiring anyone, without a workshop, and without any particular expertise.
Open your homepage. Take the first sentence that describes what your business does. Now put your closest competitor's name at the top of it and read it again.
Did anything break?
If nothing broke — if the sentence is exactly as true with their name on it as with yours — then that sentence is not about your business. It is about your category. And a customer trying to decide between the two of you just learned nothing that helps them decide.
Why nearly everyone fails this
The sentences that fail the swap test are almost never badly written. That is what makes this hard to catch. They are usually grammatical, professional, confident, and completely interchangeable.
"We deliver personalized service and quality workmanship you can count on." Swap the name. Still true. "We're passionate about helping our clients succeed." Swap the name. Still true. "With over 20 years of experience, we bring expertise to every project." Swap the name. Still true, and now two businesses are both claiming the same 20 years at the same customer.
These sentences feel safe to write, which is precisely why they get written. Nobody has ever been criticised in a meeting for saying their company values quality. The sentence carries no risk, and it also carries no information, and those two facts are the same fact.
What the test is really measuring
The swap test is not a writing test. It is a decision test.
Copy that fails the swap usually fails because the business has not decided anything specific enough to say. You cannot write a sentence only you could say until you have worked out what is actually true about you and not about the business down the street. The writing is downstream of that. Hiring a better writer to fix swap-test failures produces more elegant sentences about nobody.
This is why the fix is rarely "rewrite the homepage." The fix is a level up, in what the business has decided it is for and who it is for — and the homepage is just where you noticed.
What passing looks like
A sentence passes when a competitor putting their name on it would be making a claim that isn't true about them.
That usually means specificity of one of three kinds. Something you do that they don't: "We won't scale your ad spend until your message is settled, even if you ask us to." A customer you serve that they don't: "We work with established service businesses that grew on referrals and stalled — not startups looking for a first customer." Or a way of working that costs you something: "You work with the founder on every account, which is why we take few clients at a time."
Notice what those have in common. Each one gives something up. It excludes somebody. That is not a coincidence — a claim that excludes nobody differentiates nothing, and the discomfort you feel writing it is the signal that it is doing work.
The uncomfortable follow-up
Once you have run the test on your homepage, run it on the sentence you actually say out loud when a good prospect asks what you do.
That one almost always passes.
This is the part that surprises people. Founders are usually excellent at this in person. Put a good owner in a room with the right customer and they say the specific, slightly risky, completely true thing — because they can read the person in front of them and they know which detail matters to this buyer. Then the same business writes a website, and the website says "quality service you can trust."
The gap between those two sentences is not a writing problem. It is that the in-person version was produced by a person doing live translation, and the website version was produced by someone trying not to get it wrong.
Your marketing's job is to do what you do in that room, when you are not in the room. The swap test is the cheapest way to find out whether it currently does.
This test is one of the checks we run on everything customer-facing before it ships, because copy that could belong to anyone puts a business straight back in the pile.