Run your cap table from your AI chat.
Connect CaptableAI to Claude, ChatGPT, Cursor, Gemini or Grok, then upload documents, ask anything about your equity, model a round and commit, while CaptableAI verifies your cap table against the Open Cap Table Format and gets it IPO-ready.
Pick your assistant to get set up
Under two minutes each
Illustrative conversation. Your assistant reads your own committed cap table.
Meets you where you already work
One endpoint, three habits. Whichever you pick, authentication is OAuth and the tools are identical.
✳
In your AI chat
Add a custom connector in Claude, ChatGPT or Gemini and paste the URL. Best for asking questions, batch-uploading documents and reviewing what came out.
Set up Claude, ChatGPT or Gemini →
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In your editor
Cursor installs in one click; VS Code takes an mcp.json entry. Useful when the output belongs in a repo: board summaries, models, generated reports.
Set up Cursor or VS Code →In your terminal
The CLI runs the same commands for scripts and CI, and it's the only way to upload files between 25 MB and 50 MB.
npx @fairmint/captable-ai --help
Bridge any other client →
https://mcp.captable.ai/mcp
Everything a cap table tool does, without the cap table tool
Tools normally reserved for lawyers and finance pros, driven by conversation.
Document processing
Upload term sheets, SAFEs and stock purchase agreements. Extraction pulls the data out for you.
Cap table generation
A full ownership breakdown with share classes, vesting and dilution, built from your documents.
Pro-forma simulation
Model future rounds, option pools and exits before they happen.
Natural language Q&A
Ask anything about your equity in plain English, from any connected assistant.
What founders actually ask it
We're raising $4M on a $20M pre-money and the lead wants the pool at 12%. Where does that leave me?
On those terms the new investor takes 16.7% post-money. A 12% pre-money pool top-up comes out of existing holders, not the lead. Founders go from 80% today to 63.4% after the round.
What changed
Price per share drops because new pool shares are created before closing. The investor still gets their 16.7%.
Get your cap table verified in minutes
Drop in whatever you have today: a spreadsheet, a Carta or Pulley export, or an OCF file. We check it against the Open Cap Table Format and send back a plain-language report of what's inconsistent, missing or unprovable. If it passes, you get the verification stamp.
Open the verifier
XLSX, CSV, OCF JSON, or a Carta / Pulley export. Up to 25 MB.
Get IPO-ready, and prove it.
Every document you upload is extracted into Open Cap Table Format, then run through a company-wide validator that reconciles it against all the others. When it passes, you get a verification report your investors, auditors and bankers can check for themselves.
Give your investors a certificate, not a screenshot
A verified cap table is the prerequisite for issuing real securities. Hand yours to Fairmint's transfer agent and every shareholder gets a certificate they can see and verify, with the register of record maintained for you as things change.
Transfer agency services are provided by Fairmint TA, a subsidiary of Fairmint Inc. registered with the SEC as a transfer agent. Registration is not an endorsement by the Commission.
Illustrative certificate. Northwind Labs and Maya Okonkwo are fictional.
The upload flow, done right the first time
Extraction is automated but sequential. These seven habits are what separate a clean cap table from a re-run. Share them with your agent.
Poll, don't re-trigger
Use the MCP "and-wait" tools. Duplicate triggers only slow the queue down.
15 minutes, then worry
Nothing counts as stuck until roughly 15 minutes without progress.
Retries are a last resort
Reprocess a FAILED document, cancel a stuck run, or retrigger the validator, after the wait window.
Equity finally has an open standard. We verify against it.
Cap tables used to live in whatever shape each platform chose for them. The Open Cap Table Format changed that: one open schema for issuers, share classes, holders and every transaction between them, maintained by the Open Cap Table Coalition, a nonprofit, and used by leading securities counsel.
What OCF covers
Issuers, share classes and stakeholders
The full taxonomy of equity transactions
Vesting, valuations and documents
Machine-readable, and legally legible
Who governs it
The Open Cap Table Coalition, a nonprofit rather than a vendor. Work is underway to establish it as a Linux Foundation project so the standard outlives any one company, including ours.
CaptableAI is built by Fairmint, a Coalition member and an SEC-registered transfer agent since 2023.
Open Cap Table Coalition →Why it protects you
Your cap table is stored as schema-conformant OCF, so it's portable, auditable, and readable by any tool that supports the standard.
Leaving costs you a download, not a migration project. It is why we verify against a standard instead of inventing our own format.
Get your cap table verified →A standard established with the firms and institutions that handle trillions in equity
Open Cap Table Coalition membership reflects participation in an industry standard and does not imply endorsement of Fairmint or CaptableAI by any other member.
Founders and investors have been asking for this
“ok real talk – who is building the open-source Carta alternative/successor??”
“Expect cap tables to become commoditized at lightning speed!”
“Excel sheet is the most used captable management tool rn🤫”
“Cap table management tool: essentially Excel on steroids. Market status: nearing commoditization. Next step: cap table management as a free feature for all founders.”
“Interesting … [OCF] open source captable data format. If next-gen Carta alternatives standardize on this, we can see a lot less data lock-in and more portability.”
“Why haven’t the captable SaaS companies made it 1-click to share all of the information with VC fund’s auditors?”
Common questions
Which AI assistants can I use with my cap table?
Any client that speaks the Model Context Protocol: Claude.ai and Claude Desktop, ChatGPT, Cursor, Gemini, Grok and VS Code Copilot. Point the client at https://mcp.captable.ai/mcp and sign in with OAuth.
What is an MCP server and why does my cap table have one?
The Model Context Protocol is an open standard that lets an AI assistant call external tools. CaptableAI runs a hosted MCP server, so your assistant reads and edits your real cap table instead of guessing from text you pasted in.
How do I make my cap table IPO-ready?
Upload every legal document, let classification and OCF extraction run, then commit. A company-wide validator reconciles every object across all documents; when it passes you get an OCF verification report your investors, auditors and bankers can check.
What is Open Cap Table Format (OCF)?
OCF is the open, machine-readable standard for cap table data, stewarded by the Open Cap Table Coalition. CaptableAI stores your cap table as schema-conformant OCF, so the data is portable and auditable rather than locked into one vendor.
Which documents should I upload first?
Upload everything at once: incorporation documents, SAFEs, stock purchase and option agreements, and board consents. PDF, DOCX, XLSX, DOC and images are supported. Files up to 25 MB go through the MCP; larger files up to 50 MB use the CLI.
Does the AI change my cap table without asking?
No. Extraction produces draft objects that you review. The cap table only changes when you commit, and the first commit is what activates it.
How long does extraction take?
Documents are extracted one at a time in chronological order, a few minutes each. Nothing is considered stuck until roughly 15 minutes without progress, so poll rather than re-triggering.
Can a cap table OCF expert review my cap table?
Yes. CaptableAI offers a free 30-minute review with a cap table OCF expert covering validator findings, missing documents, migration off other cap table tools, and IPO-readiness requirements.
What does CaptableAI cost?
It is free.
Have a cap table OCF expert review it with you
Before you send anything to a lead investor, an auditor or a banker, walk through the verification report with someone who does this every day. 30 minutes, no charge, no obligation.
What we cover
Open the chat you already have. Bring your cap table with you.
Free. You need a CaptableAI-enabled company where you're an owner or admin. The server signs you into your existing account.