Open Source Cap Table
Management Software
Free for Startups
Manage stakeholders, share classes, vesting, SAFEs, and 409A valuations — all in one platform. Free to start. Carta charges $3,000/yr for the same thing.
No credit card required. Free tier, always.
Everything your cap table needs
Full equity lifecycle management — from first hire to Series C and beyond.
Stakeholder management
Track all stakeholders — founders, investors, employees, advisors, and LPs. Full OCTA v2.0 schema compliance with export at any time.
Share classes
Model complex share class structures — common, preferred, Series A/B/C — with seniority, liquidation preferences, anti-dilution, and voting rights.
Vesting schedules
Create 4-year / 1-year cliff and custom vesting schedules. Automatic cliff calculations, acceleration triggers, and exercise window tracking.
SAFE notes
Full SAFE note lifecycle — creation, conversion modeling, and post-money SAFE analysis. Models YC SAFE, post-money, and MFN variants.
Dilution modeling
Model dilution from new funding rounds, SAFE conversions, and option pool expansions. Run waterfall analysis to see exit proceeds by stakeholder.
409A valuations
AI-powered 409A valuations for $999 with 48-hour turnaround. Automatically triggered when material events are detected in your cap table.
Board management
Board member tracking, meeting management with resolutions, and consent workflows. Maintain a complete record for investors and auditors.
Data room
AI-classified document storage with gap detection. Share with investors via secure links. Track who viewed what and when.
Cap table software pricing — honest comparison
We think cap table management should be affordable for every startup — not just funded ones.
OpenCap Stack
Free tier, always
- Free for up to 25 stakeholders
- MIT licensed — self-host free
- All core cap table features
- API + MCP access
Carta
Minimum for startups
- No free tier
- Proprietary, no self-hosting
- Core cap table features
- No MCP integration
Cake Equity
Entry plan
- No free tier
- Proprietary
- Core cap table features
- No API access on base plan
Paid plans from $25/month for unlimited stakeholders. See full pricing
Why founders choose OpenCap Stack
“OpenCap replaced Carta for us on day one. We get everything we need — vesting, SAFEs, 409A — and we're not paying $3,000 a year for the privilege.”
“The MCP integration is the killer feature. I can ask Claude questions about our cap table in plain English instead of digging through spreadsheets.”
The only cap table platform with MCP integration
OpenCap Stack ships a full MCP server — the protocol that lets AI assistants like Claude and Cursor interact with external services. No competitor offers this.
- 29 MCP tools for stakeholders, equity, SAFEs, and more
- Query your cap table in plain English from Claude
- RESTful API with OpenAPI 3.0 spec
- Webhooks for equity events
- Self-hostable with full source access
> Show me the cap table summary
Cap Table — AINative Studio
────────────────────────────
Stakeholders 3
Share classes 2 (Common, Series Seed)
Equity grants 1 pending
SAFEs 2 · $500K invested
Fully diluted 12,450,000 shares
Ownership breakdown:
Founders 68.2%
Investors 22.1%
Option pool 9.7%Open source cap table management — MIT licensed
Every line of code is public. Audit how your equity data is stored, self-host on your own infrastructure, or contribute features back to the community. No lock-in, ever. Your data exports in full OCTA v2.0 format — the industry-standard open schema for cap table data.
Cap table management software — FAQ
What is cap table management software?
Cap table management software tracks a company's ownership structure — who owns what, how much, and under what conditions. It manages stakeholders, share classes, equity grants, SAFEs, and convertible notes. Good cap table software calculates fully diluted ownership, models dilution from new rounds, and generates reports for investors and auditors.
Is OpenCap Stack really free?
Yes. Our free tier supports up to 25 stakeholders, 50 documents, and 1,000 API calls per month — enough for most early-stage startups. The source code is also MIT licensed, so you can self-host the full platform for free on your own infrastructure with no artificial limits.
How does OpenCap Stack compare to Carta?
OpenCap Stack is free to start (Carta starts at ~$3,000/yr), open source (Carta is proprietary), and AI-native with MCP integration (Carta has no equivalent). Both handle core cap table management, but OpenCap also includes a $999 409A valuation service, Founder SPV management, and a full developer API.
What is open source cap table management?
Open source cap table management means the software's full source code is publicly available and auditable. OpenCap Stack is MIT licensed — you can review every line of code, self-host on your own servers, and contribute improvements back to the community. This is the opposite of proprietary platforms like Carta, where you have no visibility into how your equity data is stored.
Start managing your cap table for free
No credit card. No sales call. Full cap table management — free tier, always.