OpenCap Stack gives early-stage startups an open-source foundation for equity management — from seed-stage SAFE notes through Series A cap tables, 409A valuations, and AI-native tooling via MCP.
Real-time ownership, share classes, and equity events — always up to date.
| Stakeholder | Type | Shares | Ownership | Status |
|---|---|---|---|---|
SR Sarah Rodriguez | Founder | 4,200,000 | 42% | Active |
TK Tom Kim | Founder | 3,800,000 | 38% | Active |
SR Seed Round | Investor | 1,500,000 | 15% | Active |
OP Option Pool | ESOP | 500,000 | 5% | Reserved |
Other platforms charge $1,000-$3,000/year just to get started. OpenCap Stack is free for up to 25 stakeholders — and open source, so you can self-host at zero cost forever.
Real companies managing real equity on OpenCap Stack.
“We manage our entire cap table — stakeholders, share classes, SAFEs, and equity grants — through OpenCap Stack. The MCP integration means I can query our ownership structure directly from Claude while working on fundraising docs.”
“Switching from spreadsheets to OpenCap Stack was seamless. The employee portal gives our team full visibility into their equity without us having to field constant questions. And it's free — we were quoted $3,000/year by other platforms.”
The OpenCap Stack MCP server gives any MCP-compatible AI client direct access to your cap table. Issue equity grants, query dilution scenarios, and run waterfall analyses — all in natural language.
A complete platform for managing equity from your first SAFE through complex cap table events — structured, auditable, and interoperable.
Full OCTA v2.0 schema compliance. Issue, track, and audit every share class, stakeholder, and equity event with industry-standard data structures.
Model SAFE notes and convertible notes from first principles. Track conversion triggers, discount rates, valuation caps, and pro-rata rights across every round.
Run scenario-based dilution models and waterfall analyses. Understand how new rounds, option pool refreshes, and conversion events affect every stakeholder.
Support your 409A valuation process with structured data exports. Configure cliff, linear, and custom vesting schedules with full audit trails for option grants.
Manage your cap table from Claude, Cursor, or any MCP client. Query stakeholders, issue equity, and run dilution scenarios — all in natural language.
Store board consents, stock agreements, and option grants with full version history. Every change is tracked, timestamped, and attributable.
60+ REST endpoints with JWT auth, rate limiting, and a full OpenAPI 3.0 spec. Integrate cap table data into your own tools, workflows, and AI agents.
MIT licensed. Run it on your own infrastructure or use our managed cloud. Your equity data stays yours.
Set up your cap table in minutes. No credit card required for the free plan.