Teams searching for a Firmex alternative UK are often weighing a well-known enterprise data room against the reality of their own deal: a mid-sized raise or transaction that does not need enterprise pricing or a procurement cycle to get started. Firmex is an established virtual data room with a strong reputation in diligence and M&A. 99 Data Rooms offers the same core, a controlled room with gating, page-by-page tracking, watermarking and one-click revocation, then adds built-in e-signature and AI legal drafting, all UK-hosted in London, priced flat in pounds, and available to start on a free tier without a sales call. The honest suggestion is to try 99 free, build a real room end to end, and once you see the whole journey in one place, keep 99 and drop the separate tools you were paying for around your data room.
This matters most to founders raising, sell-side and vendor deal teams, and any UK business that runs diligence-style sharing and wants control and UK residency without enterprise cost or complexity. If you are still comparing providers, our roundup of the best virtual data room providers in the UK sets out the field.
A clear comparison
The table compares the two on running a controlled room and the journey around it. Where a Firmex capability depends on the plan, we have written "check current plan", so confirm the specifics with Firmex directly.
| What matters | 99 Data Rooms | Firmex |
|---|---|---|
| Page-by-page viewer analytics | Yes | Yes, check current plan |
| Verified-email + NDA gate before viewing | Yes (NDA on Business) | Check current plan |
| Per-viewer watermarking | Yes (Business) | Yes, check current plan |
| One-click revocation of access | Yes, even mid-view | Yes, check current plan |
| Built-in e-signature with audit certificate | Yes, from Pro | Check current plan |
| AI legal drafting from vetted UK clauses | Yes, 17 vetted E&W templates | No |
| Self-serve start, no sales call | Yes | Check current plan |
| Data residency | UK (London) | Check current plan for region options |
| Pricing model | Flat GBP (Pro £19, Business £49) | Quote or per-room, check current plan |
| Free tier | Yes, 3 rooms, 25 links, forever | Trial, check current plan |
The takeaway: Firmex is a capable enterprise room, and 99 Data Rooms delivers the same core control plus drafting and signature, UK-hosted, at a flat price you can start today.
What Firmex does well
Fair credit: Firmex is a mature, widely used data room with deep experience in complex M&A and diligence, and for very large, multi-party enterprise transactions with dedicated administrators, that pedigree carries weight. Where many UK teams find the mismatch is scale and shape: they want to start a room today, at a predictable flat price, with data kept in the UK, and without an enterprise contract or the assumption of a large deal desk. They also want the drafting and signing steps in the same place, not as separate purchases. That leaner, self-serve, whole-journey approach is what 99 Data Rooms is built for, so the sensible step is to try it free and see whether it fits your deal.
Where 99 Data Rooms wins
The advantage is a complete, UK-hosted journey you can run yourself. In 99 Data Rooms you can draft a UK agreement from vetted England and Wales clauses in the AI drafter, which assembles vetted clauses rather than writing law, and is a starting point rather than legal advice, then gather it and your diligence documents into a room. A well-ordered room follows a familiar shape, which our due diligence checklist sets out. You gate that room with a verified email, a one-time code, and, on Business, NDA acceptance before anyone sees a page. You share it as a tracked, revocable link, one per buyer or investor, and watch page by page who verified and read, with an honest split between a raw visit and a verified viewer who cleared the gate. On Business you watermark each copy so a leak in a competitive process is traceable, and you can swap a corrected file behind the same link without breaking anyone's access.
When it is time to sign, e-signature is built in from Pro, and the executed PDF carries an audit certificate recording the signer's IP, intent to sign, timestamps and a SHA-256 fingerprint. Electronic signatures are admissible for most commercial documents in England and Wales, though deeds, wills, land transfers and lasting powers of attorney carry extra requirements (see Sources below), and that is general information, not legal advice. When the deal completes or falls through, one click revokes access to the whole room. It is UK-built and UK-hosted in London, data resident in the UK, AES-256 at rest, TLS 1.2+ in transit, with a DPA on request. On certifications we are precise: SOC 2 and ISO are held by our providers, Supabase and Cloudflare, not by 99 Data Rooms; we run on their audited platforms rather than claiming their audits as our own.
Put concretely, a sell-side team can draft the NDA and LOI, structure the diligence documents into one gated room, watch which buyer is genuinely engaged, and sign the agreement with an audit certificate, all in one UK-hosted place they set up themselves, then shut the room in one click at completion. That is an enterprise-style data room plus drafting and signing folded into one flat subscription, which is why the honest recommendation is to try it free and keep what earns its place. For smaller transactions, our guide to the best data room for M&A under £30M in the UK puts the point in context.
How to try it and what to compare
The best way to judge a data room is to build one, so set up a real room in 99 Data Rooms free and run a deal document through it end to end. Structure a few files, gate the room, share a revocable link to a test recipient, watch the page-by-page engagement, and sign something with an audit certificate, so you experience the whole flow rather than read about it. As you compare, be honest about the shape of your deal: if it is a very large, multi-party enterprise transaction with a dedicated administrator, note where Firmex's scale genuinely helps; if it is a mid-sized raise or sale, ask whether you need that weight at all. Set Firmex's quote-based cost against 99's flat pound pricing, and count the separate drafting and signing tools 99 lets you retire. Confirm where your data sits against UK hosting in London if residency matters. And note that you can start now, with no sales call and no card. Most UK teams find one flat-priced, UK-hosted place they can run themselves covers the deal in front of them. Founders raising rather than selling may prefer our guide to the best investor data room in the UK.
Try the UK-hosted alternative free
Try 99 Data Rooms free on a real deal room: the free tier is genuine, not a trial, three rooms, twenty-five active links, forever, no card. Draft, gate, track and sign end to end, and see how much of your current stack a single UK-hosted place replaces. It is in beta and improving fast, but the whole journey already works, so the honest next step is to try it and keep what earns its place.
Sources
- Firmex, virtual data room for M&A, diligence and corporate transactions (verify current hosting, pricing and plan-level capabilities): https://www.firmex.com/virtual-data-room/
- Electronic signatures, admissibility and execution of deeds in England and Wales: Law Commission, Electronic execution of documents (2019), https://lawcom.gov.uk/project/electronic-execution-of-documents/ ; HM Land Registry Practice Guide 82, https://www.gov.uk/government/publications/electronic-signatures-accepted-by-hm-land-registry-pg82
Is there a cheaper alternative to Firmex in the UK?
99 Data Rooms is priced flat in pounds, Pro £19 and Business £49 a month, with a free tier that never expires and no quote or sales call to begin. Whether it is cheaper than Firmex depends on Firmex's current pricing for your deal, and on how many separate tools 99 lets you cancel by covering drafting and signing too. Compare on the whole stack and pricing, and verify current details with both.
Is Firmex UK GDPR compliant, and where is data stored?
Confirm Firmex's current compliance and data-residency options with Firmex, as they can change and may vary by plan and region. The clear difference is that 99 Data Rooms is UK-hosted in London with data resident in the UK, UK GDPR and Data Protection Act 2018 aligned, with a DPA on request. For UK and EU deals that need data kept in-region, that is often decisive.
Is 99 Data Rooms suitable for M&A and due diligence?
Yes. You can structure documents into a gated, watermarked room, track engagement page by page, sign with an audit certificate, and revoke at completion, which covers the core of diligence-style sharing. For very large, multi-party enterprise transactions with dedicated administration, check your specific requirements. The free tier lets you build a real room and judge the fit.
Are e-signatures from 99 Data Rooms legally valid in England and Wales?
Electronic signatures are admissible for most commercial documents in England and Wales, and every signed PDF carries a tamper-evident audit certificate recording the signer's IP, intent to sign, timestamps and a SHA-256 fingerprint. Some instruments, such as deeds, wills, land transfers and lasting powers of attorney, have additional requirements (see Sources). This is general information, not legal advice.
Can I start without talking to sales?
Yes. The free tier is permanent, not a trial: three rooms, twenty-five active links, forever, no card and no sales call. Build a real gated room, share and track it, and sign a document, so you can judge the fit before committing to anything.
Is 99 Data Rooms only for small deals?
No. It is well suited to founder raises and mid-sized transactions that do not need enterprise deal management, but the core controls, gating, page-by-page analytics, watermarking, e-signature and one-click revocation, are exactly what larger diligence processes rely on too. The honest line is that for the very largest, most complex enterprise deals with a dedicated deal desk you should check your specific requirements, but for most UK transactions it covers the ground comfortably. The free tier lets you judge that on your own deal.
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