Modern Startup Software to Raise, Manage Equity
Modern-era cap table management tool for forward-thinking companies to view, track, manage equity in a matter of few clicks.
Tools built to grow
For forward-thinking startups
Built for modern startups. Manage your cap table, run your funding round, and handle SEIS and EIS in one streamlined platform.
Founders
From HMRC Advance Assurance to closing your round, Undo handles the paperwork. Draft SEIS and EIS applications with our AI co-pilot, keep your cap table clean as you raise, and run an EMI scheme without a lawyer on retainer.
Investors
See your portfolio with the same precision as your fund. When founders manage their cap table on Undo, you get clean, real-time data on every round, grant, and dilution event. Whether you write angel cheques or run a fund, the numbers reconcile.
Accounting & Law firms
Run multiple founder clients from one workspace. File HMRC Advance Assurance, maintain cap tables, and administer EMI schemes across your client base without rebuilding the workflow each time. Refer R&D claims to vetted partners and earn commission.
The companies that will define the next decade are being built right now, often by founders working alone.
They move quickly. Their tools should too.
Enterprise-level Security
Built for modern startups. Manage your cap table, run your funding round, and handle SEIS and EIS in one streamlined platform.
All data stored in UK/EU data centres. Full audit trail. Right to deletion honoured.
Data controller registration confirmed. We never share your AA content with third parties.
All data is encrypted at rest with AES-256 and in transit with TLS 1.3, the same encryption standards used by banks and government systems.
Your questions answered
How is Undo different from SeedLegals, Vestd, or Carta?
SeedLegals built the per-deal legal model: you pay each time you raise, grant options, or run a round. Vestd focuses on equity and EMI scheme administration. Carta was built for US C-Corps and adapts to UK rules. Undo is built UK-first as a single platform. Advance Assurance, cap table, options, and rounds happen in one place, with AI doing the drafting and qualified practitioners signing off where the stakes are real.
Can I trust AI with an HMRC application?
You're not trusting AI alone. Our AI is grounded in the full HMRC Venture Capital Schemes Manual and reviewed by qualified tax and corporate practitioners before it reaches the platform. Every Advance Assurance draft is validated against the eligibility tests, gross asset thresholds, and Knowledge Intensive Company criteria. If HMRC follows up with questions, we help you respond.
Is Undo a law firm or an accountancy?
No. Undo is a software platform. Our AI drafts documents based on the HMRC Venture Capital Schemes Manual and current UK legislation, and the qualified practitioners we work with review the outputs that require expert sign-off. For regulated advice, including formal tax opinions or representation in HMRC disputes, you'll still need to instruct a solicitor or accountant directly.
Do I still need a lawyer or accountant?
For most early-stage equity and compliance work, no. Undo handles Advance Assurance, cap table maintenance, EMI and unapproved option schemes, and standard funding rounds. You'll want your own advisers for complex tax planning, mergers and acquisitions, disputes, or anything involving overseas structures, non-standard share rights, or bespoke investor terms.
What does Undo cover today?
The platform currently covers SEIS and EIS Advance Assurance, your cap table, EMI and unapproved option schemes, funding rounds (including SAFEs, priced equity, and convertible loan notes), a deal room for investor sharing, and a shareholders hub for ongoing equity admin. R&D tax relief is handled through our vetted partner network.
Latest articles
What Is an EMI Option Scheme? Complete Guide for UK Startups (2026)
Angel Investors UK: What They Are, How They Invest, and How to Find Them
Advance Subscription Agreements: The UK Startup's Alternative to a SAFE
