Product-Market Fit Measurement System
Measure product-market fit instead of declaring it: read your cohort retention curves for actual flattening, run the disappointment survey with a sample-size gate that refuses unreadable results, separate a pocket of segment fit from whole-product fit, track the leading indicators that move before retention does, and end with one dated decision — double down, narrow, keep searching, or pivot — plus the falsification test that could overturn it. Works in any chat model, no connected tools.
A 5-step agentic workflow pack for strategy built to run with ChatGPT, Claude, and Gemini. Open the Markdown files, fill the variables, and paste into your model. Most buyers get a reviewable result in about 30 minutes.
- Judge retention curves against a literal flattening test instead of eyeballing a chart that is still declining
- Gate every cohort on size and maturity, so thin cohorts are labelled unreadable rather than quietly quoted
- Catch ten curve distortions — survivorship denominators, billing-cycle inertia, launch spikes, one large logo — and see which way each one bends the reading
- Run the disappointment survey properly: margin of error attached to every percentage, and no headline number at all below 30 responses
- Screen the survey against ten sampling biases, starting with the one that quietly excludes everyone who already churned
- Decompose the aggregate to see whether one segment is carrying the whole number, with the counterfactual of removing it
- Pick leading indicators that plausibly precede retention, each with a deterioration trigger, not just an improvement target
- End on one verdict — double down, narrow and deepen, keep searching, pivot, or cannot decide yet — with a pre-registered test that could overturn it
Prompt Customization Service — optional help adapting variables and output to your brand voice. Choose your tier at checkout (not tied to this prompt's price).
This pack is $7 on its own. Buying every pack separately costs $1538. The Lifetime Bundle is $149 one-time — you save $1389 (90% off) and unlock every future pack free.
Get the Lifetime Bundle — $149Paste the license key from your receipt. It must match this prompt pack.
What ships with your purchase
Prompt files
Plain Markdown files with `{{variables}}` you fill in, ready to paste into ChatGPT, Claude, or Gemini. No setup, no tooling required.
Usage guide
Variable reference, model compatibility, examples, and customization tips so you can adapt the pack to your brand voice.
Lifetime updates
When we improve the pack, you get the new version automatically. Email support included with every purchase.
Works with: ChatGPT, Claude, Gemini.
The workflow inside this pack
5 composable prompts you run in order — each one picks up where the last left off.
- Step 1
Cohort Retention Curve Reader
Paste your cohort retention export straight out of PostHog, Amplitude, Mixpanel, Stripe or a spreadsheet, plus a short note on how often a happy user would naturally use the product.
- Step 2
Disappointment Survey Signal Reader
Paste your survey export plus how it was run — who was invited, how many responded, whether an incentive was offered — and the hand-off note from the retention step.
- Step 3
Segment Fit Decomposer
Paste your segment table with counts and retention alongside the hand-off notes from the retention and survey steps.
- Step 4 · optional
Leading Indicator Tracker
Paste your usage or event summary plus the segment fit hand-off note, and optionally any evidence of demand you did not manufacture.
- Step 5 · optional
Product-Market Fit Decision Memo
Paste the hand-off notes from all four preceding steps plus your runway, burn and team constraints.
Perpetual (lifetime) use license
Your one-time purchase includes an ongoing right to use this prompt pack with the AI tools and models you control for your own and your clients' work — not for resale or public redistribution of the files as a product.
We keep the copyright
The prompt files, guides, examples, and bundled assets stay our copyrighted works (or our licensors'). Payment grants the limited license in our Terms only — it does not transfer ownership.
Need help adapting this prompt to your team? Add Prompt Customization Service at checkout.