In simple English
This tool helps startup founders keep track of who owns shares in their company. It records equity grants, vesting schedules, and SAFE conversions in one self-hosted database. You can run it on your own server or a local machine to avoid high cloud subscription costs. It requires a PostgreSQL database and some basic technical setup to install and run.
What it is
Kosmitor is a full-stack cap table platform built with TypeScript and PostgreSQL. It includes an API server, a React web interface with 24 screens, and a core financial engine for ownership math.
What it is good for
Startup founders and legal teams who want to manage equity records and model fundraising rounds without paying for proprietary cloud services.
- Includes a dependency-free core engine that handles complex financial math using integer cents to prevent rounding errors.
- Provides a stakeholder portal for employees and investors to view their positions.
- Supports self-hosting so your company financial data stays on your own infrastructure.
- Requires technical skill to set up Node.js, PostgreSQL, and environment variables.
- Early-stage project with only one star and active development, so bugs may occur.
- Requires careful manual verification of all financial calculations with a qualified professional.
Carta or Pulley
PostgreSQL
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docker compose up -d echo 'DATABASE_URL=postgres://postgres@localhost:55432/kosmitor' >> apps/server/.env npm install npm run db:create npm run dev