If you are looking for a Datasite alternative, you have probably just asked what Datasite costs and been told it depends. That is accurate rather than evasive: Datasite's own FAQ says "Datasite pricing is customized for every transaction", and its general FAQ says a new project starts when you sign a statement of work (both as at 28 September 2026). For a banked auction with a corporate finance adviser steering it, that is a normal way to buy. For a founder-led raise or a mid-market sale where the whole legal and advisory budget is a known number, it is the wrong shape: you cannot compare, cannot budget, and cannot start this afternoon. 99 Data Rooms is built for the second case. The price is published in pounds, the room is UK-hosted, and you can open one, gate it, track it and sign inside it without speaking to anybody.
This is not a claim that we are Datasite's equal at the top of the market, and the table below concedes where we are behind. Datasite is a genuine incumbent of the M&A world, and if your deal is the kind it was built for, it is a strong choice. The useful question is not which platform is bigger, but which one matches the deal in front of you. If you want the wider field first, our roundup of the best virtual data room providers in the UK sets both of us in context.
What Datasite is genuinely strong at
Fair credit, and it is substantial. Datasite states on its own site that it carries "40% of the world's top 100 M&A transactions" and four of the five largest deals by transaction value in 2025, with 16,000+ transactions a year and 99.9%+ uptime since February 2022. That is a scale a newer UK platform cannot match and should not pretend to. Their certification set is one of the broadest in the category: Datasite states it holds ISO/IEC 27001, 27017, 27018, 27701, 42001 and SOC 2 Type II. If your buyer's compliance team works from a checklist of certificate numbers, that wall of credentials is a real, checkable answer, and pretending otherwise would not help you. They also build for deal scale in ways a smaller platform does not: integrated Q&A that routes follow-up questions back to the previous answerer, redaction driven by their own AI across words, data types and even text inside images, and a stated 24/7/365 live support commitment in 20 languages. On a heavily banked process with hundreds of buyer questions in flight, those are the features that earn the fee.
An honest comparison
Datasite publishes no rate card, and their engagement terms are set per transaction, so anywhere their position depends on the deal you have negotiated we have written "check current engagement" or "not published, quote-based" rather than guess. Confirm all of it with Datasite directly.
| What matters | 99 Data Rooms | Datasite |
|---|---|---|
| Published price | Yes, flat GBP: Pro £19/mo, Business £49/mo | Not published, quote-based |
| Charging model | Flat monthly plan, never per seat | Per-transaction statement of work, check current engagement |
| Free tier | Yes, 3 rooms, 25 active links, forever, no card | Free account to prepare a project; the paid boundary is not spelled out on its site, check current engagement |
| Start without a sales call | Yes, same day | No, statement of work signed first |
| Data residency | Primary data UK (London); encrypted backups in an EU region | No UK region published, check current engagement |
| Certifications | Held by our infrastructure providers (Supabase, Cloudflare), not first-party | Datasite states ISO/IEC 27001, 27017, 27018, 27701, 42001 and SOC 2 Type II |
| E-signature | Built in, from Pro (5/month on Pro, unlimited from Business) | Separate Electronic Signature by Datasite app |
| NDA acceptance gate | Yes, on Business, with receipts | Check current engagement |
| Per-viewer watermarking | Yes, on Business | Watermarking yes, per a customer account on their site; per-viewer detail not published |
| AI legal drafting | Yes, from Pro, from vetted E&W clauses | Not published on its site as of 1 Sep 2026; its published AI targets redaction and deal insight |
| Deal-scale Q&A and AI redaction | No | Yes, built into the room |
| Support | Email, priority support on Business | Datasite states 24/7/365 live support in 20 languages |
| Track record | Newer platform, shorter track record | Decades of transactions, 99.9%+ uptime since February 2022 |
The cost question, answered honestly
Datasite tells you what their billing feels like rather than what it costs: their FAQ promises prices that are "completely transparent and all-inclusive" with "no surprise add-ons", which describes the quote once you have it, not a number you can read today. No rate card, per-page rate or per-user rate appears anywhere on their site, and their own words for the model are "customized for every transaction". Its pricing FAQ, re-checked on 28 September 2026, still says the same: pricing is "customized for every transaction" and quoted to the scope, requirements and timeline of the project. Third-party blogs publish per-page estimates, and we do not repeat them: our method is to quote a vendor's own published figure or to say "not published, quote-based", because an aggregation of reviews is not a price list. The point that survives is structural: if a charge is linked to document volume, a diligence process that grows from 4,000 to 40,000 pages carries a cost you did not size at the start.
Our side of that is dull by design. Pro is £19 a month, Business is £49 a month, both flat in pounds with no per-seat surcharge, and annual billing is ten times the monthly price. An Enterprise company account carries unlimited seats, because our billing scales on storage and AI capacity, never headcount. The total is knowable before you upload anything, which is the whole argument. Full detail is on the pricing page.
Where 99 Data Rooms wins
The win is not a longer feature list. It is that one document travels the whole journey in one place, self-serve, without a bolt-on at each step. You can draft a UK agreement in the built-in AI legal drafter from vetted England and Wales clauses, which assembles vetted wording rather than inventing it and is a starting point, not legal advice. You gather that and the rest into a data room and gate it with a verified email and a one-time code, and on Business with NDA acceptance before a single page is visible, receipts included. You share a tracked, revocable link and watch page by page who read what and for how long. On Business, each viewer's copy is watermarked with their own identity, so a leaked screenshot points somewhere. When it is time to sign, e-signature is built in from Pro rather than sold as a separate application, and the executed PDF carries an audit certificate with the signer's IP, intent-to-sign consent, timestamps and a SHA-256 fingerprint. Electronic signatures are admissible for most commercial documents in England and Wales, with deeds, wills, land transfers and lasting powers of attorney carrying extra requirements (see Sources). This is general information, not legal advice.
Underneath it, the room is UK-hosted in London with primary data resident in the UK and encrypted backups in an EU region, AES-256 at rest and TLS 1.2+ in transit, and a DPA on request; the detail is on our security page and our trust page. On certifications: 99 Data Rooms runs on SOC 2 and ISO audited platforms from Supabase and Cloudflare, and those providers hold the reports. Datasite's certificate wall is broader, and if a compliance questionnaire demands a first-party certificate number, that is a fair reason to choose them.
The last difference is that you can check us. Our prices and allowances are pinned by automated tests that are run before release, so a price or an allowance should not drift out of the product and quietly stay on the website. Our public Model Context Protocol server at mcp.99datarooms.com/mcp answers questions about the product from the source, so you can point your own AI assistant at it and interrogate what we say here rather than take our word for it. Marketing you can run a test against is a strange thing to advertise, and it is the part we are proudest of.
Where we are behind, plainly
We are newer, with a shorter track record than a company whose lineage runs back through decades of transactions, and no amount of feature parity substitutes for that when a board is asking who else has used it. Our SOC 2 and ISO assurance sits at the infrastructure layer with Supabase and Cloudflare, while Datasite publishes certificates in its own name. E-signature on Pro is capped at five a month, and only becomes unlimited from Business. We have no phone-based 24/7 support tier in 20 languages: support is email, prioritised on Business. And we do not build the deal-scale machinery Datasite does, the Q&A workflow that absorbs hundreds of buyer questions with import and categorisation, or AI redaction that reaches into images. If your process needs those, that is not a gap we would talk you out of.
The honest recommendation
If you are running a nine-figure banked auction, with a corporate finance adviser, a Q&A log in the hundreds and a compliance team that wants certificate numbers, Datasite is a strong incumbent choice and you should get a quote from them. If your deal is founder-led or mid-market, and what you actually want is a known flat cost, UK primary data with EU backups, and the whole draft, gate, track and sign journey in one login you can set up today, try us free. The free tier is a tier rather than a trial: three rooms, twenty-five active links, forever, no card; the AI drafter and e-signature start on Pro at £19 a month. Run one real document through it, then compare it with the quote you were sent. For a closely-related premium comparison, see 99 Data Rooms versus iDeals.
Try the UK-hosted alternative free
Start for free and build a real gated room in an afternoon: gate the room, share tracked links, watch who read what, and draft the NDA and sign it from Pro, all in the same place. No statement of work, no card, and a price you can read on the way in.
Sources
- Datasite scale claims, certification list and encryption: Datasite homepage, https://www.datasite.com/ and https://www.datasite.com/en/company/why-datasite (both fetched 1 September 2026).
- Datasite pricing model, statement of work and free account: Datasite FAQs, https://www.datasite.com/en/resources/faqs (fetched 1 September 2026; statement of work wording re-checked 28 September 2026).
- Datasite Q&A, redaction, AI and free project trial: Datasite Diligence, https://www.datasite.com/en/products/diligence (fetched 1 September 2026).
- Electronic Signature by Datasite as a separate application: https://www.datasite.com/en/products/apps/e-signature (referenced 1 September 2026).
- Datasite pricing, quote-based and customised per transaction: Datasite FAQ, https://www.datasite.com/en/resources/faqs/how-much-does-datasite-cost (re-checked 28 September 2026).
- Electronic signature admissibility 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
Datasite does not publish a price. Its pricing FAQ says pricing is customised for every transaction and quoted to the project's scope, requirements and timeline, and its general FAQ says a new project starts when you sign a statement of work (both as at 28 September 2026), so there is no rate card to compare against. It is not published, and it is quote-based, so ask Datasite to price your actual deal in writing.
Yes. 99 Data Rooms publishes flat GBP pricing: Pro at £19 a month and Business at £49 a month, with no per-seat charge, plus a free tier of three rooms and twenty-five active links that never expires and needs no card. You know the total before you upload a document, which is the practical difference from a quote-based, per-transaction engagement.
For founder-led and mid-market diligence, yes: verified-email gating, NDA acceptance with receipts on Business, per-viewer watermarking, page-by-page analytics, one-click revocation, UK hosting in London, AES-256 at rest and TLS 1.2+ in transit. On certifications: 99 Data Rooms runs on SOC 2 and ISO audited platforms from Supabase and Cloudflare, and those providers hold the reports.
E-signature is built into 99 Data Rooms from Pro, five signatures a month on Pro and unlimited from Business, with an audit certificate recording signer IP, intent-to-sign consent, timestamps and a SHA-256 fingerprint. Datasite offers signing through a separate Electronic Signature by Datasite application rather than as a step inside the core diligence room, so signing sits outside the main workflow.
Choose Datasite for a large banked process: a corporate finance adviser running the auction, hundreds of buyer questions needing an integrated Q&A workflow, AI-assisted redaction across documents and images, 24/7 phone support in many languages, and a compliance team that wants first-party certificate numbers. Datasite states it holds ISO/IEC 27001, 27017, 27018, 27701, 42001 and SOC 2 Type II.
Every Datasite claim here links to a primary Datasite URL with its fetch date in the Sources list, and we do not repeat third-party price estimates. Our own prices and allowances are pinned by automated tests that are run before release. Our public MCP server at mcp.99datarooms.com/mcp also answers product questions from the source.
Comparison details are checked against public vendor pages at the date shown in the article and may have changed since. Names and trademarks belong to their owners.