The toolkit · 5 live · 3 shipping next
Tools you actually open.
Single-file, browser-based financial tools for the period between first paying customer and Series A. No signup. Works offline. Saves locally.
Live
01 · Live
↗Solo Founder Runway Calculator
Cash, MRR, burn, growth, planned hires. See exactly when you run out — and the cost of each hire on your timeline.
runway, cash, hire impact
02 · Live
↗MRR Health Snapshot
Quick Ratio, NRR, gross churn. One A–F grade. The same numbers Series A diligence opens with.
MRR, quick ratio, NRR, churn
03 · Live
↗Fundability Scorecard
Five inputs. One radar chart. Stage band, weakest pillar, and the first question every investor will lead with.
fundraise, pre-seed, seed, Series A
04 · Live
↗CAC Payback Calculator
Payback months, LTV:CAC ratio, scaleable / risky / unsustainable verdict — gross-margin adjusted.
CAC, LTV, unit economics
05 · Live
↗Cohort Visualizer
Retention decay curves, heatmap, cohort-based LTV — beating flat-churn estimates by 25-40%.
cohort, retention, real LTV
Shipping next (every other week)
06 · Coming
Pricing Playground
Model 3-tier pricing, churn sensitivity, net revenue across scenarios.
07 · Coming
Investor Update Compressor
Paste your numbers. Get a 5-section async-ready update in 60 seconds.
08 · Coming
Hiring Impact Simulator
Layer hires across 12 months. Watch runway, MRR, break-even shift live.
How it works
No signup. No login. No data leaves your browser.
Every tool is a single HTML page running vanilla JavaScript in your browser. Inputs save to local storage on your device — close the tab, come back next week, your numbers are still there.
No account creation. No telemetry. No data sent to a server. Export to PDF when you need to ship the result to your investor or co-founder.
The same way you'd use a calculator app — but built around the metric you actually care about.
Stay in the loop
Get the next tool the day it ships.
One email per tool. Plus the field notes behind the build — what we tested, what we threw out, the math that didn't survive contact with real customers.