Best AI Data Loss Prevention Tools in 2026
Short answer: Microsoft Purview for any team already on Microsoft 365, with DLP and Copilot data protection bundled into the Purview Suite add-on at $12/user/mo on top of an E3 license. Netskope prices inline DLP by the dimension, from $11,688 a year for 1TB of scanned cloud storage. Cyera publishes a $50,000 tier for 25TB on its data security platform. Cyberhaven, Nightfall AI, and Harmonic Security are the AI-native specialists built for ChatGPT-era leaks, and none of the three prints a dollar. Teramind is the self-serve option, from €28/seat/mo for its DLP tier, priced in EUR since the vendor's own pricing page shows no USD rate to our region.
Match the contract to the surface your data actually leaves through, not the vendor with the loudest GenAI pitch.
Every vendor on this list claims to stop sensitive data from leaving the company. The difference is which surface it actually watches: the Microsoft 365 tenant, the SaaS API, the network egress point, or the browser tab open to ChatGPT. Buy the tool built for the wrong surface and the leak happens on a channel it never inspected.
Toolradar data: 711 security tools sit in the catalog we track, 48% of them ship a free or freemium tier, and 355 tools (50%) are paid-only from the first seat.
DLP lives almost entirely in that paid-only group. Microsoft Purview is the default for any team already paying for Microsoft 365, because the labels, classifiers, and Copilot protections already sit inside the tenant. Netskope and Skyhigh Security price DLP as one line inside a bigger SSE contract, so the total depends on which other modules the account already carries. Cyberhaven, Nightfall AI, and Harmonic Security are the newer, AI-native specialists built after employees started pasting customer data into GenAI tools, and none of the three publishes a rate card. Cyera and Proofpoint sit in between: both sell a defined contract on AWS Marketplace with a real number attached.
How we ranked: these 10 were picked from the 711 security tools in the catalog for their ability to inspect and block sensitive data leaving the organization, including into generative AI apps, every price was read on the vendor's own page or a marketplace contract that vendor sells, in September 2026, and nobody paid for a slot.
Top Picks
Picked by editorial review, informed by G2 and Capterra review volume and rating and by media mentions, the signals behind our category rankings. How we rate
| Tool | Starting price | Rating | Best for |
|---|---|---|---|
| Microsoft Purview | From $12/user/mo, needs E3 | n/a | Teams whose sensitive data already lives inside a Microsoft 365 tenant |
| Netskope | $34,831/12mo per 100 users | n/a | Teams that want DLP enforced at the network layer across every cloud app |
| Cyera | $50,000/12mo up to 25TB | 3.932 reviews | Teams that want DSPM and DLP under one contract, priced by data volume |
| Proofpoint | $176,000/12mo per 500 users | 4.6601 reviews | Teams centered on email risk that also need endpoint and cloud DLP |
| Cyberhaven | Publishes no list price | n/a | Teams protecting unstructured data, like source code, that content matching alone misses |
| Nightfall AI | Publishes no list price | n/a | Teams that want one policy engine across SaaS, endpoint, and AI agent traffic |
| Harmonic Security | Publishes no list price | n/a | Teams that need visibility into shadow AI use before they write a blocking policy |
| Varonis | No usable list price | 4.688 reviews | Teams that already run Varonis for permissions and want DLP in the same console |
| Skyhigh Security | No usable list price | 4.393 reviews | Teams already evaluating SSE vendors that want DLP folded into the same suite |
| Teramind | €28/seat/mo (DLP tier) | 4.6148 reviews | Smaller security teams that want a self-serve DLP tier with a listed price |
Teams whose sensitive data already lives inside a Microsoft 365 tenant
The $12/month Microsoft Purview Suite is a budget-friendly entry point for organizations needing DLP, insider risk, and eDiscovery, but it lacks the full productivity and advanced security of the $60/month E5 tier.
Teams that want DLP enforced at the network layer across every cloud app
Netskope's custom-only pricing, with no public starting point, targets large enterprises but leaves SMBs in the dark.
Watch out
Base platform excludes ZTNA (Private Access) which costs extra
Teams that want DSPM and DLP under one contract, priced by data volume
Teams centered on email risk that also need endpoint and cloud DLP
Teams protecting unstructured data, like source code, that content matching alone misses
Cyberhaven's pricing is entirely custom, with no public figures, which is typical for enterprise security suites but makes it challenging for small buyers to evaluate upfront.
Teams that want one policy engine across SaaS, endpoint, and AI agent traffic
The Foundation tier likely starts in the tens of thousands annually, which is expensive for small teams but reasonable for organizations needing comprehensive DLP across SaaS, endpoints, and AI agents.
Teams that need visibility into shadow AI use before they write a blocking policy
Harmonic Security's all-custom pricing is opaque and likely enterprise-grade, which can feel expensive for smaller teams but is fair for large organizations needing deep AI governance.
Teams that already run Varonis for permissions and want DLP in the same console
Teams already evaluating SSE vendors that want DLP folded into the same suite
Smaller security teams that want a self-serve DLP tier with a listed price
This approach often indicates an enterprise-focused solution with potentially high costs, especially for the feature-rich UAM and DLP tiers.
Watch out
Potential minimum seat requirements
What AI data loss prevention actually covers
AI data loss prevention is software that inspects content moving through email, cloud apps, endpoints, and now AI prompts, then blocks, redacts, or quarantines what matches a sensitive-data policy. The "AI" label covers two different jobs: using machine learning to classify content more accurately than regex, and specifically watching the new exit door of GenAI chat boxes and coding agents.
The surface decides the shortlist more than the vendor's marketing. Purview inspects natively inside Microsoft 365 and extends to Copilot prompts, so it fits an organization whose data already lives in that tenant. Netskope and Skyhigh Security sit inline on the network and inside the CASB, watching traffic to any cloud app or AI site as it happens. Cyberhaven, Nightfall AI, and Cyera build their own detection layer from the ground up, aimed at SaaS APIs, endpoints, and AI agents rather than one ecosystem. Proofpoint and Teramind start from a different angle: Proofpoint from email and insider threat, Teramind from endpoint activity monitoring with DLP rules layered on top.
Harmonic Security is closer to AI governance than classic DLP: it maps what GenAI tools employees actually use before it tries to block anything leaving through them. Varonis approaches the same problem from data permissions and access, adding DLP and email protection as one module inside a wider data security platform.
Why the sticker price rarely matches the invoice
Microsoft Purview's cleanest number is the Purview Suite add-on, paid yearly on top of an existing Microsoft 365 E3 license (see the pricing table below). That add-on requires E3 already in place, so it is not a standalone DLP cost, and the alternative is Microsoft 365 E5, which bundles the same Purview capabilities at $60.00/user/mo with Teams or $51.45/user/mo without it. Consumption-based Purview pricing for data governance, security, and compliance workloads sits on a separate Azure pricing page and is not part of that per-user rate.
Netskope has no public pricing page at all. The only dollar figures come from the AWS Marketplace contract Netskope sells: inline CASB, which covers DLP scanning of data in motion, runs $34,831 for 100 users over 12 months, and a 1TB IaaS storage scan with "standard DLP/threat protection" is $11,688 for the same term. Each capability, secure web gateway, inline CASB, API-based CASB, storage scanning, is its own dimension, so a real quote is the sum of several of those lines, not one number.
Cyera and Proofpoint both sell a defined marketplace contract. Cyera's Cloud Data Security Platform starts at a five-figure annual rate for 12 months up to 25TB (see the pricing table below), rising in two further steps as the data cap rises, though the listing prices the platform broadly rather than breaking out a DLP-only line. Proofpoint's Information Protection package, which the listing describes as "DLP Transform" including endpoint DLP, cloud DLP, SaaS isolation, and insider threat management, is $176,000 for 500 users over 12 months, a separate line from the $96,000 core email security package for the same 500 seats.
Cyberhaven, Nightfall AI, and Harmonic Security publish nothing. Nightfall's own pricing page shows a bare dollar sign with no number next to "per user/year," and its AWS Marketplace listing prices each dimension at a nominal $1.00, which is a placeholder, not a rate. Varonis and Skyhigh Security are the same story from a different angle: their marketplace listings exist, but Varonis leaves the billing unit undefined across ten separate per-connector dimensions, and Skyhigh's "Complete" package is listed at $0.001, also a placeholder. None of those four numbers belongs on a budget line.
Key Features to Look For
Content inspection tuned for false positives (Essential)
Cyera's Omni DLP claims up to 98% fewer false positives by adding data, identity, destination, and business context to alerts, and Skyhigh's UEBA layer narrows billions of raw events to thousands of anomalies. A DLP tool that fires on every 16-digit number will get its alerts ignored within a month.
Coverage of the GenAI prompt box (Essential)
Netskope inspects traffic into ChatGPT inline, Nightfall blocks a paste into ChatGPT, Gemini, or Perplexity and can redirect to an approved tool, and Proofpoint's Data Security for AI monitors prompts and uploads into Copilot. A tool that only watches file uploads misses the copy-paste leak.
Data lineage, beyond content matching (Important)
Cyberhaven traces where a file originated and who has handled it, which catches source code, product designs, and recorded meetings that carry no recognizable pattern a keyword scanner would flag.
AI agent and MCP visibility (Important)
Nightfall's Premier Edition hooks into Cursor, Claude Code, and VS Code to inspect prompts, MCP tool calls, and shell commands, and Harmonic's Command tier adds MCP client and server discovery. Skip this layer only if the estate has no coding agents yet.
Native fit with the existing productivity suite (Essential)
Purview classifies and labels inside Microsoft 365 without a separate agent, extending to Microsoft 365 Copilot data protection. A non-Microsoft shop gets none of that native advantage and pays for a fresh deployment either way.
Insider risk and behavioral signals (Important)
Teramind's DLP tier adds 200 pre-packaged DLP rules plus keystroke logging and screen recording, and Proofpoint layers communications analysis to read intent, not only content. This is the module that catches a departing employee, not a misconfigured share link.
What to settle before the demo
Name the surface first: Microsoft 365 content, SaaS APIs, network egress, or the AI prompt box. Purview wins the first, Cyberhaven and Nightfall the second and fourth, Netskope and Skyhigh the third.
Ask whether the quoted module is DLP specifically or a broader data security platform. Cyera's terabyte tiers and Varonis's per-connector dimensions both price the platform, not a DLP line item by itself.
Separate the email channel from everything else. Proofpoint sells People Protection and Information Protection as two contracts for the same 500 users, so an email-only need still touches two SKUs if insider threat protection is required.
Check whether the vendor's own pricing page shows a real number or a bare currency symbol. Nightfall, Harmonic, Cyberhaven, Varonis, and Skyhigh all require a sales call before a budget line exists.
Decide how much employee monitoring the team actually wants. Teramind's DLP tier ships with keystroke logging and screen recording bundled in, which is a heavier posture than a content-only scanner.
Evaluation Checklist
On Microsoft Purview, confirm whether the E3 base license is already owned before pricing the Suite add-on, and separately price Azure consumption charges for data governance workloads.
On Netskope, list every dimension needed (inline CASB, API CASB, storage scanning, secure web gateway) and size each to the actual user or terabyte count before comparing the total to a single-line competitor.
On Cyera, ask the seller in writing whether DLP enforcement is included in the Standard tier or billed as a separate line beyond the 25TB data cap.
On Proofpoint, get the People Protection and Information Protection quotes on the same page, since the DLP-carrying package is a second contract on top of core email security.
On Cyberhaven, Nightfall, and Harmonic, ask for a written quote range before the demo, since none of the three publishes even a starting number.
On Varonis and Skyhigh, ask the seller to define the billing unit on every marketplace dimension in writing before treating any listed figure as a price.
Pricing Overview
Bundled into an existing suite
Microsoft Purview, priced against an existing Microsoft 365 tenant.
Add-on, or bundled into E5
Marketplace contract, defined unit
Netskope, Cyera, and Proofpoint, billed by users or terabytes.
Four to six figures / 12 mo
Self-serve, per seat
Teramind, with a 5-seat minimum and an annual discount. Priced in EUR, no confirmable USD rate.
From about €11/seat/mo
No public price
Cyberhaven, Nightfall AI, Harmonic Security, Varonis, and Skyhigh Security.
Quote only
Pricing Comparison
| Tool | Published price | What that price buys | Billing |
|---|---|---|---|
$12/user/mo (Suite) | DLP, info protection, insider risk, audit, eDiscovery, Copilot data protection. Needs an M365 E3 base. | Add-on, or $60/user/mo bundled in E5 | |
Netskope | $34,831 / 12 mo | Inline CASB for 100 users, covering DLP scanning of data in motion. | 12-month marketplace contract |
Cyera | $50,000 / 12 mo | Cloud Data Security Platform, Standard tier, up to 25TB. Not a DLP-only line. | 12-month marketplace contract |
Proofpoint | $176,000 / 12 mo | Information Protection for 500 users: endpoint DLP, cloud DLP, SaaS isolation, insider threat management. | 12-month marketplace contract |
Cyberhaven | Publishes no list price | AI-native DLP, DSPM, and insider risk via data lineage. Demo required for any figure. | Quote |
Publishes no list price | Foundation and Premier editions, per user per year, plus an AI agent and MCP security layer. | Quote, or a 7-day proof of value | |
Publishes no list price | Explore, Guide, and Command tiers for GenAI visibility and control. Demo required. | Quote | |
Varonis | No usable list price | Ten per-connector dimensions (AWS, Box, Salesforce, Slack, and more), each with an undefined unit. | 12-month marketplace contract |
No usable list price | Complete SSE package, billed per user. The marketplace listing shows a placeholder rate, not a real one. | 12-month marketplace contract | |
Teramind | €28/seat/mo (DLP tier) | Content-based rules, sensitive content redaction, 200 pre-packaged DLP rules, LLM content rules. Priced in EUR, no USD rate confirmed. | Monthly or annual, 5-seat minimum |
Prices were checked on vendor pages and vendor-sold AWS Marketplace contracts on September 24, 2026. Teramind's own pricing page and pricing API served EUR only to our session; no first-party USD rate was confirmable, so Teramind's price here is shown in EUR, not converted. See security for the wider catalog, and AI tools for security teams for SOC-facing tools rather than data controls.
Mistakes to Avoid
- ×
Pricing Purview's Suite add-on as a standalone DLP cost. That figure sits on top of an existing Microsoft 365 E3 license, not instead of it, so the real cost includes whatever the E3 base already runs.
- ×
Comparing Netskope's single CASB dimension to a competitor's all-in price. That figure covers inline CASB for 100 users only; secure web gateway, API-based CASB, and storage scanning are separate lines most deployments also need.
- ×
- ×
Assuming Proofpoint's email security quote already includes DLP. People Protection and the DLP-carrying Information Protection package are two separate contracts for the same seat count, not one bundle.
- ×
Reading a $1 or $0.001 marketplace listing as a real number. Nightfall's and Skyhigh's marketplace dimensions show placeholder prices the vendor never finished configuring, not a discount or a typo worth negotiating from.
- ×
Buying Teramind's DLP tier for content scanning alone. The tier also turns on screen recording and keystroke logging by default, which changes the conversation with employees and, in some jurisdictions, with works councils or legal.
Expert Tips
- →
Ask Microsoft which base license the Purview Suite price assumes. If the tenant already holds E3, the add-on is the marginal cost; if not, treat E5 at $60.00/user/mo or $51.45/user/mo without Teams as the real comparison point.
- →
Request Netskope's full dimension list before comparing a single line to another vendor's flat rate. A quote missing secure web gateway or API-based CASB is not comparable to a platform that bundles those in.
- →
- →
Push Cyberhaven, Nightfall, and Harmonic for a number before the demo, not during it. None of the three publishes a rate, and a written range going in makes the call about fit, not about extracting a first figure.
- →
Decide the monitoring posture before shortlisting Teramind. Its DLP tier is the cheapest listed per-seat rate in this group, but it comes with keystroke logging and screen recording by default.
- →
Do not average these contracts into one monthly figure. A per-user suite add-on, a per-terabyte platform contract, and a quote-only enterprise deal answer different budget questions, and the wider catalog sits at security. If Purview is the incumbent everyone is trying to unseat, see Microsoft Purview alternatives.
Red Flags to Watch For
- !
A Purview quote that never states whether the buyer already holds the required E3 base license, since the Suite add-on price assumes it.
- !
A Netskope or Skyhigh proposal that quotes one flat number without listing which dimensions (CASB, DLP scanning, secure web gateway) that number includes.
- !
- !
A Proofpoint quote that bundles Information Protection into the email security line instead of pricing it as its own package.
- !
Any AWS or Azure Marketplace listing with a price under $1, which is a placeholder the vendor never finished configuring, not a real rate.
The Bottom Line
Microsoft Purview when the sensitive data already lives inside Microsoft 365, on the Suite add-on price above, or bundled into E5. Skip it if the estate is mostly non-Microsoft SaaS.
Netskope or Skyhigh Security when DLP needs to sit inline on network and cloud traffic across many apps at once, and the team can live with a multi-dimension marketplace contract instead of one flat number.
Cyera when the buying question starts with data volume rather than user count, and Proofpoint when email and insider threat sit at the center of the risk, on the DLP-carrying package priced above.
Cyberhaven, Nightfall AI, and Harmonic Security when the estate is AI-native: GenAI prompts, coding agents, and SaaS copilots the older platforms were not built to watch. Expect a demo before a number on all three.
Varonis when DLP only needs to live beside permissions and access data already tracked there, once the per-connector units are defined in writing. Teramind when a smaller team wants a listed, self-serve rate for the DLP tier, and can accept the activity-monitoring features that come with it.
Cite this: Toolradar, "Best AI Data Loss Prevention Tools in 2026", September 2026. Prices checked on vendor pages and vendor-sold marketplace contracts in September 2026. No paid placement. Compared against the 711 security tools we track.
Frequently Asked Questions
What is the best AI data loss prevention tool in 2026?
Microsoft Purview, for any team whose sensitive data already lives inside Microsoft 365. The Purview Suite add-on, which bundles DLP with information protection, insider risk management, and Copilot data protection, is priced on top of an existing E3 license (see the pricing table above), or the same capabilities come inside Microsoft 365 E5.
Pick Netskope or Skyhigh Security if DLP needs to sit inline on network and cloud traffic across a mixed app estate. Pick Cyera or Proofpoint if a defined marketplace contract, priced by data volume or user count, matters more than an all-in Microsoft bundle.
How much does AI data loss prevention cost in 2026?
As of September 24, 2026, Microsoft Purview's Suite add-on is $12.00/user/mo, paid yearly, on top of an M365 E3 license. Netskope's inline CASB dimension, which covers DLP scanning of data in motion, is $34,831 for 100 users over a 12-month AWS Marketplace contract, and a 1TB storage-scanning dimension is $11,688 for the same term.
Cyera's Cloud Data Security Platform starts at $50,000 for 12 months up to 25TB. Proofpoint's DLP-carrying Information Protection package is $176,000 for 500 users, separate from its $96,000 core email security package for the same seats. Teramind's DLP tier runs €28/seat/mo billed annually, with a 5-seat minimum; the vendor's pricing page and pricing API served no USD rate to our region, so that figure is EUR, not converted. Cyberhaven, Nightfall AI, Harmonic Security, Varonis, and Skyhigh Security publish no usable list price; expect a quote after a demo.
Is there a free AI data loss prevention tool in 2026?
No tool in this ranking gives away DLP. Every pick here is either bundled into a paid suite, priced as a marketplace contract, or sold entirely on a quote. Nightfall offers a 7-day proof of value instead of a self-serve trial, and several vendors offer a demo, but none of that is a working free tier.
Teramind and Microsoft Purview come closest to a low commitment: Teramind has a 5-seat minimum rather than a large enterprise floor, and Purview's cost is marginal for a team that already holds Microsoft 365 E3 or E5.
How does Microsoft Purview compare with Netskope for DLP?
Purview inspects natively inside Microsoft 365, labeling and classifying content in Exchange, SharePoint, OneDrive, and Teams without a separate agent, and it extends that same policy to Microsoft 365 Copilot prompts through its Suite add-on.
Netskope sits inline on the network and inside the CASB, watching traffic to any cloud app or AI site, not only Microsoft's own, priced by the 100-user band on its inline CASB dimension. A Microsoft-centric estate gets more native coverage per dollar from Purview; a mixed-cloud estate with heavy non-Microsoft SaaS use needs Netskope's broader inline reach, or both together.
Which AI data loss prevention tools cover GenAI prompts and AI agents?
Netskope inspects traffic into ChatGPT inline as part of its DLP dimension. Nightfall AI blocks a paste into ChatGPT, Gemini, or Perplexity and can redirect the user to an approved tool, and its Premier Edition adds hooks into Cursor, Claude Code, and VS Code to inspect prompts and MCP tool calls.
Harmonic Security's Command tier adds MCP client and server discovery and granular agent permissions, though prompt injection detection there is still listed as coming soon. Proofpoint's Data Security for AI monitors prompts and uploads into GenAI tools and Copilot in real time, and Microsoft Purview covers Copilot specifically through its Suite add-on.
Why do so many AI data loss prevention vendors not publish pricing?
Cyberhaven, Nightfall AI, Harmonic Security, Varonis, and Skyhigh Security all withhold a public rate, and the pattern is consistent with enterprise security software generally: pricing scales with data volume, user count, and which modules a buyer picks, so a single list price would misrepresent most deals.
Marketplace listings sometimes fill the gap with a real, defined number, as with Cyera's terabyte tiers or Proofpoint's DLP package, both priced in the table above. Elsewhere the marketplace dimension is a placeholder, such as Nightfall's $1.00 line or Skyhigh's $0.001 line, which is not a number worth quoting either. The only way to get a real figure from those five is a written quote.
Cite this page: Toolradar, "Best AI Data Loss Prevention Tools in 2026", updated September 2026, https://toolradar.com/guides/best-ai-data-loss-prevention-tools
Sources
Prices and plan details on this page come from each vendor's own pricing page, re-checked by the Toolradar pricing tracker: