Pure Build.
No AI. No hype. Just deterministic tools for founders & builders.
Reducing complexity to logic. One calculator at a time.
The Toolkit
Every tool runs in your browser. Your data never leaves your machine.
Equity Calculator
Calculate exact option value, ownership %, and post-exit returns.
Runway Calculator
Track burn rate, forecast death date, and plan your next move.
Dilution Simulator
Model equity dilution across funding rounds. See your slice shrink.
Unit Economics
Calculate LTV:CAC ratio, payback period, and unit profitability.
True Hourly Rate
Factor in equity, taxes, and hours to find your real hourly rate.
Net Revenue Calculator
Calculate revenue after payment gateway fees. Stripe, PayPal, etc.
API Token Cost
Estimate OpenAI and Claude API costs before the bill arrives.
Capacity Planner
Project database storage needs and plan for scale.
Viral Coefficient
Calculate K-factor and model viral growth loops.
Tool Workflows
Latest Insights
Deep dives into startup math
The Knee in the Curve
Why systems don't fail linearly. The mathematics of Queueing Theory and the 80% utilization trap.
Read more 2025-12-28Capital Table Logic
Understanding pre-money vs post-money option pools, and how investors quietly dilute you before the round even starts.
Read more 2025-12-28The Mathematics of Founder Equity
Why the 50/50 split is a mathematical error, and how to use game theory to prevent dead equity.
Read moreLearn the Math
Deep dives into startup metrics, unit economics, and financial planning.
No fluff. Just logic. No AI-generated nonsense.
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