Founder tooling · GenAI product
Napkin
Size your software business on a napkin
Plain-English market sizing and unit economics for vibe coders, solo founders and venture builders. No spreadsheets, no jargon.
Business problem
Most early-stage founders skip market sizing because the existing path (a TAM/SAM/SOM spreadsheet plus a unit-economics tab) is intimidating, takes a day, and gets abandoned halfway. The result is unscoped bets and numbers that fall apart the moment an investor asks where they came from.
AI-enabled workflow
- 01Operator picks one of five software archetypes (Consumer Subscription, B2B Self-Serve SaaS, B2B Seat-Based SaaS, High-Touch SaaS, Usage-Based / API).
- 02Plain-English intake (who the buyer is, what they pay, how you'd reach them) replaces finance jargon.
- 03Napkin maps the answers to TAM/SAM/SOM and LTV, CAC, contribution margin using industry benchmarks, with every default linked to its source.
- 04Outputs render as clean charts and cards; every assumption is editable via an Advanced panel so any number can be overridden when the founder has better data.
- 05Export as PNG charts, a PDF summary, or a CSV of every assumption and output, ready to drop into a pitch deck.
Prototype built
- Five-archetype guided flow built end-to-end in Lovable.
- Sourced benchmark library, with overrides on every input.
- Three-format export (PNG / PDF / CSV) so the output survives leaving the app.
- Booking CTA into a fully-sourced fundraising workbook for founders who need to defend the numbers in front of investors.
Tools used
Commercial use case
Productised tool for the long tail of pre-seed founders, indie operators and venture builders sizing several bets at once. Replaces the back-of-the-napkin spreadsheet most founders abandon, and upsells into a paid 'fundraise-grade' workbook engagement.
ROI / adoption potential
A defensible first-pass sizing in a 5-minute session instead of a half-day spreadsheet.
Illustrative assumptions
- Baseline: a founder spends roughly 4 to 6 hours assembling a usable TAM/SAM/SOM and unit-economics view manually, and most never finish it.
- Napkin compresses that to a 5-minute guided session, with sourced defaults and editable overrides.
- Adoption assumed at one sizing pass per founder per quarter during early traction, plus one repositioning cycle per fundraise.
Numbers above are illustrative, not measured outcomes. Included to make the commercial logic legible to a hiring conversation.