Stop guessing whether you have product-market fit.
FitSignal asks your users the one question that predicts whether you’ll scale or stall — then turns their answers into a score, the evidence behind it, and your next move.
Your growth chart can’t tell you
if anyone would actually miss you.
Signups, MRR, even retention — they all lag. By the time the numbers turn, the market already decided. The Superhuman method asks users directly: “How would you feel if you could no longer use this product?” — and 40% “very disappointed” is the line between scaling and stalling.
From “I think users like it”
to a number you can defend.
PMF Score Dashboard
One score against the 40% benchmark, with trend over time, statistical confidence, and the response distribution behind it. Filter by survey, period, or persona.
Word Cloud Analysis
Why your biggest fans love you — and, linked to each benefit, exactly what holds the almost-convinced back. Two clouds, one connected story.
AI Improvement Analysis
Free-text feedback clustered into themes and ranked by impact — frequency × severity × persona weight. Your roadmap, argued with evidence.
PMF Surveys & Email
Branded email invitations, reminders, delivery tracking, and eligibility rules that never survey the same user twice. Set it up once, let it run.
In-app Widget & SDK
A two-line embed that surveys users inside your product at the right moment — with page targeting, cooldowns, and a JavaScript SDK when you want control.
Personas & Segments
Your score means nothing averaged. Break it down by customer segment, mark target personas, and see exactly where fit is real — and where it isn’t.
Three steps. First signal this week.
Bring your customers
Import a CSV, sync via the API, or let the widget identify users automatically. Assign personas — or start with our eight presets.
Send the 7 questions
By branded email or in-app widget. Eligibility rules pick users with enough usage to have an opinion — and never ask anyone twice.
Read the score — and act
Watch your score against the 40% line, see who loves you and why, and get an AI-ranked list of what to fix first. Then ship, and measure again.
Your fans tell you what to protect. The almost-fans tell you what to build.
FitSignal links the two: pick any benefit your “very disappointed” core loves, and instantly see what’s blocking the “somewhat disappointed” users who want the same thing. That’s the shortest path to moving your score.
Explore Word Cloud Analysis →A hundred opinions in. One ranked roadmap out.
Claude reads every improvement request from your “somewhat disappointed” users, clusters them into themes, and scores each by frequency × severity × how much your target personas care. Every theme links to the verbatim quotes behind it — no black box.
Explore AI Improvement Analysis →NPS® surveys are here.
Fit was only the first question.
PMF tells you whether the market needs you. NPS® tells you how that relationship is going — continuously, across your whole customer base. Same engine, same personas, same honest methodology. FitSignal is a licensed Net Promoter® vendor.
Explore NPS® surveys →Would they miss you?
Find out this week.
Explore everything free. Collect feedback with the in-app widget or a share link from day one. Pay only when you’re ready to email your customers — backed by a 60-day money-back guarantee.