Comparison
Seisly does SEIS and EIS advance assurance. SeedLegals is a full legal and fundraising platform that offers it as a paid add-on to a subscription. Here is an honest comparison of price, scope and turnaround.
| Seisly ✦ | SeedLegals | |
|---|---|---|
| Advance assurance price | £99 prepared, or £399 fully done for you | £499 as an add-on, or one included on the £1,199 Funding plan |
| Can you buy advance assurance on its own? | Yes | No – a plan is required |
| Cheapest total for one advance assurance | £99 | £578 (one month of Access at £79, plus the £499 add-on) |
| Subscription required | None | Yes – Access £649/yr or £79/mo, Funding £1,199/yr, Options £2,699/yr |
| Percentage-of-raise fees | None | Yes, on funding rounds |
| Prepared for you | Yes | Guided build with expert review |
| Submission to HMRC | Included in the £399 package | Included |
| Wider platform | Advance assurance, with more launching | Cap table, rounds, options, compliance, R&D |
| Specialist SEIS/EIS focus | Sole focus | One module among many |
Scroll across to compare →
Prices verified against seisly.com, seedlegals.com/pricing and foundercatalyst.com, 24/07/2026.
Seisly charges £99 for the application prepared and ready for you to file, or £399 for the full service including human review by a Chartered Tax Adviser and submission to HMRC. One payment. Nothing else to buy.
SeedLegals prices advance assurance at £499, but it cannot be bought on its own. You need a plan first: Access at £649 a year or £79 a month, Options at £2,699 a year, or Funding at £1,199 a year which includes one advance assurance or compliance application. The cheapest route to a single advance assurance is therefore £578 – one month of Access plus the add-on – or £1,148 on an annual Access plan.
A solicitor or accountant typically charges between £1,000 and £2,500, usually billed hourly.
SeedLegals has no minimum term and you can cancel at any time, so nobody is locked in. The cost is not lock-in, it is that the platform is the entry ticket. To reach a £499 application you must first buy a subscription to a platform you may not have come for. If you want the cap table, the round documents, the option schemes and the compliance work, that is a reasonable trade. If you want an advance assurance application, you are paying for a platform to reach a product.
Seisly has no plan to buy. £99, or £399 for the full service, once.
And where SeedLegals bundles everything into a subscription you rent, Seisly's model is a one-off core today, with the wider toolset – cap table, documents, outreach – arriving this year and an adviser network already in place for the work that needs a regulated firm.
Seisly is built by a Chartered Tax Adviser and ICAEW Fellow who founded the UK's first SEIS fund in 2012. The eligibility engine tests your company against the statutory conditions and tells you where you fall short, including where the honest answer is that you do not qualify.
Advance assurance is where Seisly starts, not where it stops. Cap table, fundraising document templates and investor outreach are arriving through this year, building toward support across the whole raise. And Seisly already connects founders with law firms and advisers who work on fixed, competitive fees – so when you do need regulated advice, you are not left to find it alone or pay open-ended hourly rates.
SeedLegals covers the full lifecycle today – cap table, funding rounds, share issues, EMI and unapproved options, compliance, R&D claims and exit documents – as an established platform. The difference is the model: SeedLegals sells the platform as a subscription; Seisly is building the same breadth around a specialist core you buy once.
Seisly drafts your application from a short questionnaire, usually in under an hour. HMRC then typically takes 4 to 8 weeks to respond, whichever route you use.
SeedLegals is for founders who want one established platform across the whole company lifecycle today and expect to use several of its products in a year.
Seisly is for founders who need advance assurance done properly now, from a specialist – and who want a platform that is building outward across the raise, with an adviser network already on hand for regulated work, rather than a subscription rented for a single document.
A lawyer is for genuinely complex or bespoke structures, or where an investor requires formal advice.
No. Advance assurance is an add-on priced at £499 and requires an active plan. The cheapest combination is a month of Access at £79 plus the £499 add-on, so £578 in total. The Funding plan at £1,199 a year includes one advance assurance or compliance application. Seisly sells advance assurance on its own from £99, with no plan required.
Yes, on every route. £99 prepared or £399 fully done for you, against £578 as the cheapest SeedLegals combination and £1,148 on an annual Access plan.
Seisly is a specialist: SEIS and EIS advance assurance, priced as a one-off. SeedLegals is a broad legal and fundraising platform sold as an annual or monthly subscription, with advance assurance as a paid add-on. Different products for different needs.
Funding round products are charged separately from the plan, and round fees apply on top of the subscription. Seisly charges nothing on what you raise.
For a straightforward application, yes. For genuinely complex cases – a borderline excluded trade, a group or overseas structure, or an investor who requires sign-off from a regulated firm – a solicitor or tax adviser is the right call, and Seisly can refer you through Seisly Advisers.
Seisly drafts from a short questionnaire, usually under an hour. HMRC then typically takes 4 to 8 weeks, whichever route you use.
Figures verified against seisly.com; seedlegals.com/pricing; foundercatalyst.com, 24/07/2026. Competitor prices and HMRC thresholds are taken from primary sources, not from either party's marketing about the other.
Check whether you qualify in about five minutes, free. If your case needs more than an application, your report will tell you.
No account, no email sign-up.