Choose what to get done
Compute the Van Westendorp acceptable price range
I enter each respondent's four price answers and get back the deterministic Van Westendorp points (PMC, PME, OPP, IPP) on the observed price grid, so I have a defensible acceptable-price band.
Compute Viral Coefficient and Loop-Driven User Growth
A founder learns their viral K-factor and the cumulative users a seed cohort generates across viral cycles, so they can judge whether the product can grow on the viral engine alone.
Customer lifetime value (simple and discounted)
The customer lifetime in years, the simple LTV, and the discount-adjusted LTV you can put against CAC.
Diagnose the Fatal Pinch
A pure function that classifies a startup against Paul Graham's fatal-pinch definition: default-dead AND slow growth AND not enough time, returning the overall verdict and which of the three conditions are true.
In-House Build-vs-Buy Tendency Scorer
A founder weighing whether to sell an AI capability as a service gets a 0-6 in-house-tendency score and a build/buy verdict per the book's exact criteria, flagging capabilities customers will just build themselves.
Net Promoter Score
A correct NPS from raw 0-10 responses, with the promoter/passive/detractor breakdown.
Net revenue retention with leaky-bucket flag
A correct NRR computation (net of expansion) with a leaky-bucket verdict and a benchmark comparison.
Project a Weekly Growth-Target Schedule
A pure function that, given a starting metric value, a weekly growth rate, and a number of weeks, returns the compounded target for each week and the final value, mirroring the YC forward-looking growth graph practice.
Rank product features with a collaborative weighted scorecard
A product team prioritizing a roadmap gets each feature's weighted value, cost normalized to the most expensive feature, absolute value, and a deterministic rank, computed exactly per the CWS formula.
Route a Founder Task to the Right Claude Surface
The founder gets a pure routing function that takes a task's structured attributes and returns the correct Claude surface, applying the book's surface-selection logic deterministically across any list of tasks.
SaaS magic number
Your SaaS magic number (annualized new revenue over prior-quarter sales-and-marketing spend) with an efficiency band telling you whether to scale acquisition.
Score AI model process and tool maturity into bands
A team assessing whether an AI model is mature enough to sell as a service gets a process-maturity band and a tool/system-maturity band computed directly from per-phase level scores, ready to feed the AIaaS feasibility decision.
You are not what you make. You are the one who can make it.
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