The spreadsheet your cap table deserves.
A browser tool for GPs: exit waterfall, ownership dilution, and fund MOIC on a venture cap table. No account. The model runs here, on this machine.
Sample data is loaded. Open the app and click Run Model.
Why this exists
Cap table math is deterministic. Spreadsheets are not. Workbooks break when you add a holder. A down round means rebuilding the file. The file lives on a laptop, or in Slack.
Why CapStack exists — current scope, plainly.
Free calculators
Score a SaaS company on the Rule of 40 and Bessemer's growth-weighted Rule of X, side by side. Rule of 40 calculator
SAFE conversion calculator · Startup dilution calculator · Exit waterfall calculator
Fund start — see the fund your materials already describe.
Cost, privacy, control
- Cost
- The modeling app has no paywall, no seats, no trial. Optional website embeds have a separate branding tier; that is not this tool.
- Privacy
- Deal data stays in your browser (
localStorage). Normal modeling does not send the cap table to CapStack. The host sees a page load. Modeling pages serve Fraunces and DM Mono from this site. The skills screener still loads Inter and Source Serif from Google Fonts. Optional AI, feedback, and the email signup leave the machine only if you use them. Privacy. - Control
- Export JSON. Import it later. Close the tab. There is no shared cloud file and no login to revoke. Terms.
A pre-decision model — not a cap table system of record, and not legal, tax, or investment advice.
Working with partners?
The free model stays free and local. When a firm needs shared funds, shared models, and invites: Share with your partners →
Publisher
CapStack GP publishes this site. Questions go through Send Feedback in the model. No account is required.