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Should I use OpenCap Stack?

Open-source cap table & equity management - opencapstack.com

Depends. A reasonable free option for technical, pre-Series A founders who will self-host or accept an early-stage product. Avoid it if you need vendor support, audits, or a proven track record — none appear in the evidence.

Confidence

Low. Based on ~11 public sources; nearly all product claims are vendor-published. Many 'security' and 'pricing' search results referenced OpenStack (the unrelated cloud platform) and were excluded. No independent user reviews found.

Ratings

  • Value for money
  • Ease of useNo user evidence found
  • Feature depth
  • Support qualityNo user support evidence found
  • Security posture

Pricing

$0

Self-hosted (open source)

ModelNot disclosed
Monthly feesNot disclosed
HardwareNot disclosed
Free tierYes

Best for

  • Pre-seed to Series A startups
  • Cost-sensitive founders avoiding Carta fees
  • Technical teams comfortable self-hosting
  • Accountants doing 409A reviews

Not for

  • Non-technical founders wanting hands-off hosted service
  • Late-stage companies needing audited vendor SLAs
  • Teams requiring phone support and compliance guarantees
  • Buyers who need a mature product with real user reviews

Gotchas - check before you buy

medium

Hosted pricing not clearly published; free applies to self-hosting — verify before committing

medium

Self-hosting shifts backups, upgrades, and security patching onto you

medium

Database was migrated from MongoDB to ZeroDB mid-project; expect further infrastructure changes

low

Docs live on a third-party domain; continuity risk if that relationship ends

Pros and cons

Pros

  • Free, MIT-licensed, and self-hostable — every line reviewable
  • Aligned with the Open Cap Table standard for portability
  • Scenario modeling and post-money dilution tracking built in
  • 409A support via credentialed accountant reviewers
  • API and MCP server for programmatic access

Cons

  • No independent user reviews found; evidence is vendor-published
  • Tiny footprint: 7 followers on the GitHub org
  • Docs and API split across and domains
  • Mid-flight database migration (MongoDB to ZeroDB) signals churn
  • Self-hosting means you own backups, upgrades, and patching

Sources & method

Analyzed 9/29/2026 - 11 sources - No known vulnerabilities found in the sources reviewed.

official x7review x3news x1

Key stats

  • Value for money: 5/5

    Rating

  • $0

    Starting price

  • 11

    Sources

  • Analyzed

  • Value for money: 5/5. Free, MIT-licensed, self-hostable per vendor
  • Ease of use. No user evidence found
  • Feature depth: 4/5. Scenarios, dilution, 409A exports, API, MCP server
  • Support quality. No user support evidence found
  • Security posture: 3/5. Open-source auditable; no independent audit found
  • Yes Free tier MIT-licensed, self-hostable
  • $0 Starting price Self-hosted open source
  • 7 GitHub org followers Open-Cap-Stack on GitHub

Pricing

Self-hosted (open source)

$0

  • MIT license, review full code
  • Host your own cap table data
  • Open Cap Table format import/export

Security

No known vulnerabilities found in the sources reviewed.

What users say

No independent third-party reviews or verbatim user quotes were found in the sources reviewed.

Full analysis

Based on ~11 public sources; nearly all product claims are vendor-published. Many 'security' and 'pricing' search results referenced OpenStack (the unrelated cloud platform) and were excluded. No independent user reviews found.

Free MIT-licensed cap table tool aligned to Open Cap Table format — promising but unproven; no independent reviews found.

Methodology

Based on ~11 public sources; nearly all product claims are vendor-published. Many 'security' and 'pricing' search results referenced OpenStack (the unrelated cloud platform) and were excluded. No independent user reviews found.

Sources

  1. OpenCap Stack — Open Source Cap Table & Equity Managementopencapstack.com
    official
  2. Cap Table Management Software | Free, Open Sourceopencapstack.com
    official
  3. Earn as a 409A Reviewer — OpenCap Stack for Accountantsopencapstack.com
    official
  4. Open-Cap-Stack/opencap GitHub repositorygithub.com
    official
  5. Open Cap Stack GitHub organizationgithub.com
    official
  6. OpenCap Stack Overview — OCTA schema docsdocs.ainative.studio
    official
  7. OpenCap Stack security pageopencapstack.com
    official
  8. Carta vs Pulley vs OpenCap Stack comparison (vendor blog)opencapstack.com
    review
  9. Best Cap Table Software for Startups in 2026 (vendor blog)opencapstack.com
    review
  10. Ranveer Deshmukh — OpenCapStack MongoDB to ZeroDB migrationin.linkedin.com
    news
  11. Private Equity vs Venture Capital (third-party mention)ainative.ax
    review

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