8.3 ICP Sharpening Over Time

Your ICP is wrong right now. Not slightly off. Wrong. You built it from assumptions before you had real customers, and assumptions are just educated guessing. The good news is that being wrong at the start is completely normal. The problem is when founders refuse to update their ICP even after the data screams at them to change it.

Andre Heckle Jr launched ListKit targeting cold email senders, but his first 1,000 paying customers in six months weren’t who he expected. They skewed heavily toward agencies and coaches, the same audience he’d already built trust with. That insight let him double down on that segment and reach $2.4M ARR. He didn’t discover his real ICP by thinking harder. He discovered it by paying attention to who actually paid and stayed.

Here’s how to run ICP analysis at each milestone.

At 10 customers, you don’t have enough data to draw conclusions, but you have enough to spot a pattern. Look at who reached out without much friction, who activated fastest, and who’s already getting value before you’ve even onboarded them properly. Those people are a signal. Write down everything they have in common: industry, company size, role, problem they described, how they found you.

At 25 customers, you can start separating signal from noise. Sort them by engagement or product usage. The top third are your real ICP candidates. The bottom third are warning signs. Don’t celebrate total customer count. Celebrate the ones who use the product every week without you nudging them.

At 50 customers, churn becomes your most honest advisor. Look at who churned in the first 60 days and find the common thread. Wrong role, wrong company size, wrong use case, wrong expectation set during sales. That thread is your negative ICP, and defining who your product is not for is just as important as defining who it is for.

The Best Customers Interview

Right now, identify your top three customers. These are the ones who use the product most, complain constructively, refer others, or pay the most. Book a 20-minute call this week. Ask them five questions.

What were you doing before you found us? What made you decide to try it? What would you lose if we disappeared tomorrow? Have you told anyone else about us, and if so, what did you say? What kind of person do you think gets the most out of this product?

That last question is the one founders skip. Your best customers know your ICP better than you do. They’ve already identified themselves as the person this was built for, and they can describe their peers in exact language you can use in your messaging.

Now comes the part that scares everyone. Narrowing. Every founder resists it because it feels like leaving money on the table. It’s not. It’s the opposite. Nick built BlockToPin for a specific customer type, served them obsessively by reviewing screen recordings and building requested features within hours, and turned them into a word-of-mouth engine that grew to 400 active subscribers without him knowing where half of them came from. That only works when your product fits one type of customer so well they can’t stop talking about it.

Broad ICPs produce mediocre retention and silent customers. Narrow ICPs produce compounding growth.

This week, do one thing: pull your customer list, rank them by engagement or revenue, and write one paragraph describing the top 20%. That paragraph is your updated ICP. Everything else is noise you should stop chasing.