Best Sertifi Alternative for Law Firms in the UK (2026)

A law firm's contract work is drafting-led and review-led. Fee earners write from precedents, mark up counterparty paper, judge risk and tie every document to a matter and client. Sertifi is a solid platform for secure e-signature and payment authorisation, trusted in sectors that process many agreements quickly, but it was never meant to be the tool a solicitor drafts and reviews in. For a UK firm, Sertifi usually sits at the signing step while the real legal work happens elsewhere. This guide is fair about Sertifi, then gives a shortlist for UK firms with Adira as one named option. ## What Sertifi is, and the fit question for firms Sertifi does secure signing and payment authorisation well, and in the right setting that is valuable. The question for a law firm is whether a signing tool addresses the work that fills a fee earner's day. Drafting from the firm's own precedents, comparing clauses, redlining third-party documents and keeping a reliable audit trail are all outside Sertifi's purpose. That is not a criticism of the product, it is a difference in category. A firm looking past Sertifi is usually looking for a drafting and review platform rather than a better signature. ## What a UK law firm needs from the tool Frame the brief around fee-earner work. A firm wants drafting that reflects its house style and precedents, redlining and clause comparison a solicitor can rely on, matter and client linkage so each document carries its context, dependable version history for the audit trail, and clause-level editing that is fast and precise. Clear pricing helps partners plan, and data handling must meet UK GDPR and ICO expectations. The tool has to fit the way fee earners already draft and review, not the other way round. ## A fair shortlist of Sertifi alternatives for UK law firms Order the list by whether your firm is review-heavy, drafting-heavy or negotiation-heavy. - Luminance is a UK-rooted legal AI strong on due diligence and high-volume review for transactional teams.

• Robin AI supports AI-assisted drafting and review and suits negotiation-heavy practices.
• Spellbook works inside Word, assisting drafting and redlining where fee earners already write.
• ContractPodAi is a broader legal platform for firms wanting workflow alongside AI assistance.
• Adira is an AI-native workspace, covered below, for firms wanting drafting, review and governance together with clear pricing. ## Where Adira fits for a law firm Adira is an AI legal operating system built on Anthropic's Claude. It combines drafting, review, clause-level editing, version history and compliance tracking in one workspace instead of several disconnected tools. The AI Drafting Studio produces a structured clause tree rather than flat text, so edits are precise and clause dependencies stay linked, which matches how precedents actually behave. The Document Intelligence dashboard marks positions as favourable, neutral or unfavourable to your client, flags risks, missing clauses, key dates and obligations, and clause-level editing lets a fee earner change terms in plain English and receive a clean diff. The Company Persona learns from the firm's own documents, so drafts sound like the firm and skew terms in the client's favour rather than reading like a generic template. Adira states that it does not train on your contract corpus, and the Enterprise tier adds SSO and SAML, audit logs and data residency controls for firms with stricter governance. On Adira's own measured results, 18 law firms already use the product and rank it highly, and across those live deployments contract review and due diligence that used to take 10 to 12 days was cut to under 2 hours, with only 2 to 3 rechecks needed in total. These are Adira's own figures and not an independent study, so treat them as a vendor benchmark and confirm the effect on your own matters. Adira publishes its per-seat pricing, which is rare in a category where most tools are quote-only. Practice is $89 per seat per month billed annually and Firm is $179 per seat per month billed annually, with a custom Enterprise tier and a 7-day free trial. UK firms are billed in US dollars that convert to roughly the equivalent in pounds, so confirm local billing and the current pound figure during the trial. You can read more at adiralaw.com. ## Being fair about the trade-offs Adira is a challenger, not the category leader. India is its deepest jurisdiction today, so a firm doing heavy English-law work should verify coverage on its own documents during the trial. The Company Command Centre is on the roadmap rather than live. For the very largest due-diligence exercises, Luminance may be the stronger specialist, and for firms that simply want drafting help inside Word, Spellbook sits closest to existing habits. Those are honest reasons to choose differently. ## How to choose Match the tool to your dominant work. If due diligence and review volume lead, Luminance is strong. If negotiation drafting dominates, Robin AI helps. If drafting inside Word is the habit, Spellbook fits, and ContractPodAi suits firms wanting broader workflow. If you want drafting, review and governance in one workspace with transparent per-seat pricing, shortlist Adira and run live matters through the 7-day trial. Keep Sertifi for the narrow job it does well, which is secure signing and payment, and choose a drafting and review platform for the legal work itself. On cost, Adira's published per-seat pricing lets a firm compare it against quote-only tools without a sales call, billed in US dollars that convert to roughly the pound equivalent, with the current pound figure worth confirming during the trial. This is general information, not legal advice.