PMFtracker vs PMFsurvey.com
Both run the Sean Ellis test. The difference is what happens after you get your score. PMFsurvey.com tells you your number. PMFtracker tells you what to do with it — and tracks it over time.
Start your free trial → 14-day free trial · No credit cardFirst, credit where it's due
PMFsurvey.com is free, and it was created by Sean Ellis — the person who originated the 40% product-market fit test in the first place. If you want to run the survey once and get a quick read on your score, it's a great, no-cost place to start. We built PMFtracker on the exact methodology Sean Ellis pioneered.
Where the two part ways is what comes next. A one-time score answers "where am I today?" PMFtracker is built for the harder, more valuable questions: "which way is it moving, who exactly loves this, and how do I prove it to investors?"
Feature comparison
| Capability | PMFsurvey.com | PMFtracker |
|---|---|---|
| Sean Ellis 40% survey | ✓ | ✓ |
| One-time PMF score | ✓ | ✓ |
| Free | ✓ | 14-day trial |
| Score tracked over time (trend) | — | ✓ |
| Automated alerts on score change | — | ✓ |
| In-product survey widget | — | ✓ |
| ICP / customer segmentation | — | ✓ |
| AI sentiment analysis of open-ends | — | ✓ |
| PostHog Cohorts integration | — | ✓ |
| Investor-ready reports | — | ✓ |
Comparison reflects PMFtracker's feature set and PMFsurvey.com as a free single-survey scoring tool.
The real difference: a snapshot vs a system
A PMF score you measure once is a photograph of a moving thing. It can't tell you whether you're climbing toward fit or sliding away from it. PMFtracker turns that snapshot into a system: the survey runs on a cadence, the score becomes a trend, your "very disappointed" users get profiled into an ICP, and the whole thing exports as evidence for your next raise.
If you just need a one-time gut check, the free tool is perfect. If PMF is something you need to improve and prove over the months between now and Series A, you need to track it. Here's how the improvement loop works →
Track your PMF score — don't just measure it once
Run the same Sean Ellis survey, then watch your score move, find your ICP, and build the report investors want. Pay once, measure forever.
Start free → 14-day free trial · No credit card · The Sean Ellis template is pre-loadedFrequently asked questions
What is PMFsurvey.com?
A free survey tool created by Sean Ellis, the originator of the 40% PMF test. It lets you run the Sean Ellis survey and get a one-time PMF score.
How is PMFtracker different?
PMFtracker tracks your score over time, segments users to find your ICP, runs AI sentiment analysis, integrates with PostHog, and exports investor-ready reports — built around the trend, not a single number.
Is PMFsurvey.com free?
Yes. PMFtracker is a paid one-time lifetime purchase (PMF Starter $79, PMF Startup Kit $149) with a 14-day free trial, for founders who want to track and act on PMF continuously.
Which should I use?
For a quick one-time read, PMFsurvey.com is great. To improve and prove PMF over time — with a trend, an ICP, and investor reports — use PMFtracker.
