Focus on building.
We'll handle the cap table.
OpenCap Stack gives founders a free, open-source foundation for equity management — from your first SAFE note through Series A cap tables, dilution models, and AI-native tooling via MCP.
Free for up to 25 stakeholders. No credit card required.
Sound familiar?
Most founders manage equity in ways that break at the worst possible moment — right before a raise or acquisition.
Spreadsheet chaos
Version-controlled cap tables in Google Sheets break the moment a co-founder leaves or a SAFE converts. One stale formula wipes out your ownership model.
Expensive tools at the wrong time
Carta and Pulley charge $1,000–$3,000 per year before you have product-market fit. That budget belongs in engineering, not software subscriptions.
No API access
Proprietary platforms lock your equity data behind closed systems. You can't query your own cap table programmatically or integrate it with the tools your team actually uses.
Everything a founder needs, nothing you don't
Built by founders who were frustrated with the existing tools. Open source, API-first, and designed to get out of your way.
Free for up to 25 stakeholders
Founders, co-founders, early employees, angels, and SAFE holders — all tracked at no cost. Upgrade only when your cap table outgrows the free tier.
SAFE note tracking from day one
Model valuation caps, discount rates, and pro-rata rights. See exactly how each SAFE converts at your next priced round before you sign anything.
Dilution modeling before your raise
Run scenario-based dilution models before you negotiate term sheets. Understand the impact of option pool shuffles, new investors, and SAFE conversions on every stakeholder.
AI-native — manage equity from Claude or Cursor
29 MCP tools let you query stakeholders, issue grants, and run dilution scenarios in plain English. Your cap table becomes a first-class citizen in your AI workflow.
Open source — own your data
MIT licensed and self-hostable. No vendor lock-in, no proprietary schema. Export to OCTA v2.0 format at any time and take your data anywhere.
Employee equity portal
Give every team member a self-serve view of their vesting schedule, grant details, and ownership percentage. Stop fielding equity questions over Slack.
Set up your cap table in minutes
No spreadsheets. No $3,000 software bill. Free for up to 25 stakeholders — and open source, so your data is always yours.