Ranked mostly on data protection, with extra credit for ISO 27001, HIPAA, redaction and document rights control.
Every serious data room encrypts files and logs access. The differences that matter show up one level down: whether the vendor holds an ISO 27001 certificate as well as a SOC 2 report, whether an admin can stop a reviewer from printing or downloading a single file, whether sensitive passages can be redacted inside the room, and how detailed the audit trail is when someone asks who saw what.
This list weights the Data protection criterion at 45% and adds points for the attestations and controls a security reviewer usually asks about. A room needs both dynamic watermarking and an audit trail to be eligible at all.
| # | Provider | List score | Entry price | Trial |
|---|---|---|---|---|
| 1 |  Ellty | 97 | $149 a month | 14-day free trial |
| 2 |  iDeals | 96 | Quote only | Free trial offered |
| 3 |  Datasite | 96 | Quote only | Demo on request |
| 4 |  Intralinks | 93 | Quote only | Demo on request |
| 5 |  Ansarada | 91 | Quote only | Free trial offered |
| 6 |  Drooms | 90 | Quote only | Demo on request |
| 7 |  Firmex | 89 | Quote only | Free trial offered |
| 8 |  SmartRoom | 88 | Quote only | Demo on request |
| 9 |  Box | 87 | $15 per user/mo | Free trial offered |
| 10 |  Citrix ShareFile | 87 | $55 a month | Free trial offered |
Top 10 most secure virtual data rooms: the top three
Ellty 97 Document rights control iDeals 96 ISO 27001 certified, Native redaction Datasite 96 ISO 27001 certified, Native redaction Complete diligence room with AI built in, a modern interface and a $149 monthly price printed openly.
Why it made the list Document rights control · Data protection 9.4/10 · Diligence toolkit 9.5/10
Established UK-headquartered M&A room with deep security credentials and the best support marks we give.
Why it made the list ISO 27001 certified · Native redaction · Data protection 9.6/10
The investment-banking standard: the widest feature checklist we track, analytics and AI, priced by quote.
Why it made the list ISO 27001 certified · Native redaction · Data protection 9.6/10
Veteran enterprise room for regulated, security-heavy deals, with ISO 27001 and redaction.
Why it made the list ISO 27001 certified · Native redaction · Data protection 9.6/10
Australian deal room built around readiness and governance, with AI tools and ISO 27001.
Why it made the list ISO 27001 certified · Document rights control · Data protection 9.3/10
German room with deep real-estate roots, AI tools and an on-premises option for European deals.
Why it made the list ISO 27001 certified · Native redaction · Data protection 9.2/10
Dependable mid-market room from Canada, easy for outside reviewers and strong on support.
Why it made the list ISO 27001 certified · Native redaction · Data protection 9.0/10
Security-minded M&A room known for granular permissions and a disciplined Q&A workflow.
Why it made the list ISO 27001 certified · Native redaction · Data protection 9.3/10
Enterprise content cloud with strong compliance and integrations, but no deal Q&A or redaction.
Why it made the list ISO 27001 certified · HIPAA listed · Data protection 9.0/10
Client file sharing with built-in e-signature and HIPAA, popular with professional services firms.
Why it made the list ISO 27001 certified · HIPAA listed
Deciding between the top two? Read Ellty vs iDeals for a criterion-by-criterion comparison and a cost calculator.
Entry rule for this list: dynamic watermarks and an audit trail.
How this list weights the six criteria
Security attestations across the field
Both attestations listed.
No ISO 27001 in our facts.
Relevant for health data.
Named in certifications.
The full criteria definitions and the sources behind each mark are on how we rank. Every provider we track, including the ones that did not make this list, has a profile on the leaderboard.
A SOC 2 report describes how a vendor operates its controls over a period and is read by your security team under NDA. ISO 27001 is a certificate for an information security management system, issued by an accredited body. Many procurement checklists name ISO 27001 explicitly, which is why it earns the largest bonus here. Ask for the scope of either document: it should cover the data room product, not just a parent company.
Some vendors list SOC 2 for the cloud infrastructure they run on. That is real assurance about the hosting layer, but it is not the same as a SOC 2 report on the vendor's own application and processes. Our profiles say which kind each provider lists, so you can ask the right follow-up question.
Ask the vendor to show view-only access with printing and downloading switched off for one group, a watermark carrying the viewer's email and timestamp, a redaction applied and then audited, and an export of the activity log for one document. Each takes a minute to demonstrate and tells you more than a feature grid.
On current scores Ellty ranks first, with iDeals and Datasite next. The top places go to rooms that pair high data protection marks with ISO 27001, SOC 2, redaction and document rights control. All rooms here meet the baseline of dynamic watermarks plus an audit trail.
For deal documents, usually yes. A data room adds per-document permissions, view-only modes, dynamic watermarks and a complete access log, which general cloud drives either lack or leave to the user to configure. The trade-off is cost and a narrower purpose.
No. Our score reflects published certifications and documented controls. It is not an incident history. Ask each vendor directly about past incidents and how they notify customers.
Ask for the current SOC 2 Type II report and, if your policy requires it, the ISO 27001 certificate with its scope statement. Regulated buyers may also need HIPAA terms or a data processing agreement under GDPR.
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