Stop guessing if you have product-market fit
FitSignal is the PMF measurement engine built on the proven Rahul Vohra methodology. Send the 7-question survey, get your score, see exactly what to build next — all in one place.
Free forever · No credit card · First score in under 5 minutes
Building without PMF data is flying blind
Most founders rely on gut feel, anecdotal feedback, and vanity metrics. Here's what that costs you.
You build the wrong features
Without PMF data, your roadmap is based on the loudest voices — not the features that move the needle with your best customers.
Churn stays a mystery
Users leave and you don't know why. Was it missing functionality? Wrong audience? A PMF survey tells you in their own words.
You waste months on pivots you didn't need
A single PMF score shows whether to pivot, iterate, or double down. Without it, every strategic decision is a coin flip.
The 5-step engine that finds product-market fit
The same methodology Superhuman used to go from 22% to 58% PMF — now automated for indie founders and small teams.
Survey
Send the 7-question PMF survey via email, widget, or link.
Segment
Group responses by persona. Find the segment that already loves you.
Analyze
See your score, word clouds of what users love, and what blockers want fixed.
Implement
Prioritize: strengthen what lovers love, fix what blockers want. Ignore the rest.
Track
Re-survey quarterly. Watch your score climb as you iterate.
Survey
Send the 7-question PMF survey via email, widget, or link.
Segment
Group responses by persona. Find the segment that already loves you.
Analyze
See your score, word clouds of what users love, and what blockers want fixed.
Implement
Prioritize: strengthen what lovers love, fix what blockers want. Ignore the rest.
Track
Re-survey quarterly. Watch your score climb as you iterate.
Proven by Superhuman. Built for you.
“If 40% or more of your users say they'd be ‘very disappointed’ without your product, you have product-market fit.”
Rahul Vohra, CEO of Superhuman
Starting PMF
Achieved PMF
Methodology validated by hundreds of startups · The 40% threshold is the industry standard
Everything you need, nothing you don't
Enterprise tools are overkill. FitSignal gives you the focused toolset to measure, understand, and improve product-market fit.
Your PMF score, one number
The percentage of users who'd be 'very disappointed' without your product. Track over time, compare periods, see how changes move the needle.
What users love and what's holding them back
Word clouds surface the exact language your customers use. See what power users love and what on-the-fence users want fixed.
Find your beachhead segment
AI persona assignment groups customers automatically. Your overall score might be 25%, but one segment could be at 60%.
Collect feedback inside your app
A lightweight widget installed with a single script tag. No engineering work. Customers answer right where they use your product.
Surveys that actually get answered
Send via email with reminders, embed in your product, or share a link. Three channels, one unified dashboard.
Pipe PMF data into your workflow
REST API, webhooks, Slack integration, CSV/JSON/Excel export. Whatever your stack, FitSignal fits in.
From the blog
Learn the methodology, see real examples, and stay current on PMF best practices.
Product Market Fit for SaaS: A Simple Guide
For SaaS products, product-market fit (PMF) means users keep using your product because they truly need it, not just because switching would be a hassle. One...
The Sean Ellis 40% Test: The Ultimate Guide
The Sean Ellis 40% test is the most validated method for measuring product-market fit. Ask your users "How would you feel if you could no longer use...
How to Improve Your Product Market Fit Score
If your PMF score is below 40%, focus on two things: find the user segment that already loves you (they exist), and fix the specific blockers that keep...
Built for founders who ship, not committees that meet
Solo founders & indie devs
You've shipped v1 and users are signing up. But are they sticking around because they love it, or because they haven't found an alternative? FitSignal gives you the answer.
Small SaaS teams
Your roadmap is a list of opinions. FitSignal turns it into a prioritized plan: strengthen what power users love, fix what blockers want, ignore the rest.
Migrating from Delighted
Delighted sunsets June 2026. FitSignal is purpose-built for PMF measurement with the same ease of use — plus persona segmentation, word clouds, and an embeddable widget.
Every feature on every plan
We don't gate features behind pricing tiers. Only volume scales.
Free
250 surveys/mo
Indie
3,000 surveys/mo
Growth
10,000 surveys/mo
Scale
30,000 surveys/mo
Common questions
We recommend at least 40 responses for a statistically meaningful PMF score. Below that, each new response can swing the number significantly. With 100+ responses you can confidently segment by persona and track trends over time.
If you have users actively using your product, you're ready. The PMF survey is designed for products that have shipped and have real users — even if it's just 50 people. You don't need thousands of users to start measuring.
A Google Form collects answers. FitSignal calculates your PMF score, generates word clouds, segments responses by persona, tracks trends over time, and tells you exactly what to build next. It's the difference between raw data and actionable insight.
That's exactly when FitSignal is most valuable. A low score tells you to segment your users, find the ones who do love your product, understand what they value, and double down on that segment. The methodology gives you a playbook to improve — not just a number.
The Free plan is free forever — 250 surveys per month, all features included, no credit card required. Most indie founders never need to upgrade.
Get your PMF score in under 5 minutes
Create an account, send your first survey, and see your score. Free forever for small projects.