Every UK startup needs a clear answer to one question: who owns what, and how does that change with every hire, raise, and option grant? Getting that answer right and keeping it right is what cap table management software is built to do.
This guide walks through what it is, why founders outgrow spreadsheets, how the main UK platforms compare, and how to move across without breaking anything.
What Is Cap Table Management Software?
Cap table management software is a digital platform that tracks who owns what in your company by replacing a spreadsheet with a live record that updates automatically as shares, options, and convertible instruments change hands. So what is a cap table, exactly? It's a ledger of every shareholder, the type and number of shares or options they hold, and any SAFEs or convertible notes that could turn into equity later. For a pre-seed founder with three co-founders and no investors, a spreadsheet does the job fine. The problem starts once you add option pools, multiple funding rounds, and outside investors at that point, the ownership picture gets complicated fast, and cap table management software becomes less of a nice-to-have and more of a basic operating requirement.
This is also where the two terms founders often confuse start to split. Cap table software, strictly, tracks ownership and dilution. Equity management software is the broader category; it adds option scheme administration, valuations, and compliance reporting on top. In practice, most UK platforms now blend the two, which is exactly why choosing the right cap table software for startups matters more than it did five years ago.
Why Spreadsheets Break at Series A
A spreadsheet cap table typically breaks down once you're juggling more than one funding round, an active option pool, and several convertible instruments at the same time, the exact combination most startups reach by Series A. Every new financing, grant, SAFE, or convertible note adds another tab, another formula, another version right as investors and lawyers are scrutinising the numbers most closely. Recording a common share as preferred, or forgetting to reflect a converted SAFE, is enough to make the whole document unreliable in an investor's eyes.
The version-control problem is just as common. One copy sits with the founder, another with finance, a third in an old email thread and by the time a round enters due diligence, none of them fully agree. That's precisely the gap that cap table management software is designed to close: a single, live source of truth rather than three competing spreadsheets. Investors aren't just checking that your numbers add up, they're using your cap table to model dilution, exit returns, and how much of the company genuinely produces that return. Any ambiguity in the structure breaks that model instantly, and a messy cap table at term sheet stage costs you time you don't have.
SeedLegals vs Capdesk vs Vestd vs Carta
The right cap table software for startups in the UK usually comes down to four names: SeedLegals, Vestd, Carta, and folded into Carta from 2022 Capdesk. Carta acquired the UK-founded Capdesk in a deal announced in September 2022, so Capdesk no longer operates as a standalone competitor; its former customers now sit on Carta's platform. Worth knowing if you see Capdesk mentioned in older comparison articles.
SeedLegals is the UK-first option, built around SEIS/EIS and early-stage fundraising rather than adapted from a US product. Its Access plan (cap table management with unlimited shareholders, plus legal documents and board tools) runs £649/year + VAT, with Funding and Options plans layered on top for £1,199/year and £2,699/year respectively. SeedLegals states it has supported over 60,000 companies and more than £2 billion raised on the platform figures the company reports itself rather than independently verified totals.
Vestd is the other UK-focused specialist, built around UK share schemes including EMI and CSOP with two-way Companies House integration. Pricing starts from roughly £25/month for early-stage companies, scaling up for larger teams.
Carta is the global player strongest for later-stage, cross-border, or IPO-track companies, with a free Launch tier for eligible early-stage founders and a £250/year Raise plan for companies with fewer than five stakeholders.
Most SeedLegals vs Carta comparisons come down to the same trade-off: SeedLegals leans into UK-specific fundraising support and transparent, capped pricing, while Carta brings global scale and later-stage depth at less predictable, custom pricing. If you're weighing SeedLegals vs Carta specifically for a pre-seed or seed round, the SEIS/EIS specialism tends to tip it towards SeedLegals; if you're already thinking about US expansion or a cross-border cap table, Carta's global reach starts to matter more.
How to Migrate Without Breaking Anything
Migrating to cap table management software without introducing errors means reconciling every historic transaction against your Companies House filings before you switch anything live. Many providers offer migration support as part of onboarding: a migration specialist pulls your existing records, cross-checks them against Companies House data, and flags discrepancies before the new platform goes live rather than simply uploading a spreadsheet and hoping for the best. You can typically keep your existing legal documents or adopt the platform's standard templates, and many straightforward migrations can be completed within a few days to a couple of weeks, depending on complexity, depending on how complex your ownership structure has become.
A few habits make this smoother on your side. Gather every option grant, SAFE, and share certificate before you start, rather than mid-migration. Nominating one person internally to be the single point of contact for the reconciliation process splitting it across founders is how details get lost. And don't switch off your spreadsheet until the new platform has been checked against Companies House and signed off, so you always have a fallback during the transition.
Choosing the Right Tool for Your Stage
The right cap table management software depends less on company size and more on what you're doing next, raising SEIS/EIS, running a UK option scheme, or scaling internationally. Pre-seed and seed founders raising through SEIS or EIS are usually best served by SeedLegals, given its UK-specific fundraising tooling and transparent pricing. Founders whose immediate priority is setting up or administering an EMI or CSOP scheme tend to find Vestd's UK-first share-scheme features a tighter fit. And founders already thinking about later-stage rounds, US hires, or a genuinely global cap table generally outgrow the UK-only tools and move towards Carta.
None of this is permanent; plenty of startups migrate cap table software more than once as they scale. The point isn't picking the "best" platform in the abstract; it's picking the one built for the problem you actually have right now.
FAQs
1. When does a spreadsheet cap table stop working?A spreadsheet cap table typically stops working once you're managing multiple funding rounds, an active option pool, and convertible instruments like SAFEs at the same time, usually somewhere around Series A. At that point, version-control errors and share-class mistakes become common enough that most founders move to dedicated cap table management software.
2. How do you migrate to cap table software without errors?You migrate without errors by having a provider reconcile every historic transaction against your Companies House filings before the new platform goes live, rather than uploading a spreadsheet as-is. Most UK providers build this reconciliation into onboarding, and straightforward migrations usually complete within one to two weeks.
3. How much does cap table software cost for UK startups?UK cap table software costs range from free (Carta's Launch tier for eligible early-stage companies) to around £2,699/year for SeedLegals' full Options plan. Vestd starts from roughly £25/month, and Carta's entry-level Raise plan is £250/year for companies with fewer than five stakeholders.
4. What is a cap table?
A cap table (short for capitalisation table) is a ledger that records who owns what in your company every shareholder, the shares or options they hold, and any convertible instruments like SAFEs that could turn into equity later. It's the single source of truth investors, founders, and employees use to track ownership as the company raises, hires, and grows.
Also read: Bridge Round Startup Funding: Why It's No Longer a Red Flag
Sources: SeedLegals, Vestd, and Carta pricing pages (current as of 2026); Crunchbase, Sifted, and Carta's own reporting on the 2022 Capdesk acquisition. Company-reported figures are attributed to the company in-text rather than presented as independently verified. Figures reflect the most recent available data at the time of writing.
The EP+ Editorial Desk covers UK startups, founder stories, and venture capital. All editorial content is independently produced and human-reviewed before publication.
