OpenCap Stack gives early-stage startups a structured, open-source foundation for equity management — from seed-stage SAFE notes through Series A cap tables, 409A valuations, and beyond.
A complete platform for managing equity from your first SAFE through complex cap table events — structured, auditable, and interoperable.
Full cap table management aligned with the Open Cap Table Alliance (OCTA) v2.0 schema. Issue, track, and audit every share class, stakeholder, and equity event with industry-standard data structures.
Model SAFE notes, convertible notes, and equity grants 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 to understand how new rounds, option pool refreshes, and conversion events affect every stakeholder's ownership.
Support your 409A valuation process with structured data exports and vesting schedule automation. Configure cliff, linear, and custom vesting with full audit trails for option grants.
Manage your cap table from any AI chat through the built-in MCP server. Query stakeholders, run dilution scenarios, and issue equity programmatically — all from Claude, Cursor, or any MCP-compatible client.
Store board consents, stock purchase agreements, option grants, and investor reports with full version history and audit trail. Every document change is tracked, timestamped, and attributable.
OpenCap Stack is fully open source under MIT license. Run it on your own infrastructure with no vendor lock-in, or use our managed cloud. Either way, your equity data stays yours.
Set up your cap table in minutes. No credit card required for the free plan.