Best Shadow AI Detection Tools in 2026
Short answer: Netskope is the shadow AI detection tool to start with for a mixed estate in 2026. Netskope says its inline inspection covers 1,800+ AI apps, tells corporate accounts from personal ones, and can coach, redact or block, on a custom quote. Microsoft Purview fits Microsoft 365 shops at $12 per user per month over E3. Harmonic Security and Prompt Security are the browser-first specialists, Reco finds AI hidden inside SaaS, and Cloudflare is the one option here with a free plan.
10 tools that find unsanctioned AI use, score the risk and enforce policy, with prices checked on vendor pages in October 2026.
Buy shadow AI detection by what the tool can see, not by the dashboard. Netskope is the first one to shortlist for a mixed estate, because its inline inspection reads AI traffic across 1,800+ apps by Netskope's own count, and most of the other nine tools on this page cover the places that miss: the browser, the SaaS graph, and the expense report. Every tool here finds ChatGPT. Far fewer find the AI feature switched on inside a CRM, or the agent a team connected with an OAuth grant. Toolradar data: of the 717 security tools we track, 49% have a free or freemium plan, yet only one of the ten below (Cloudflare) does, and the other nine are paid or contact-sales listings.
Shadow AI hides on three planes, and each tool looks at one or two of them. The network plane (Netskope, Cloudflare, Microsoft's Global Secure Access) sees traffic from managed devices. The browser and endpoint plane (Harmonic Security, Prompt Security, LayerX, Nightfall AI) sees the prompt and the account on the device. The identity and spend plane (Reco, Torii, Zylo) sees SSO logins, OAuth grants and card charges, which is where AI built into sanctioned SaaS and connected agents show up. A program that covers one plane has a blind spot the size of the other two.
Methodology: these 10 were ranked for a CISO or IT lead who must discover unsanctioned AI use, score the risk and enforce policy, against the 717 tools in the security tools category. Prices come from vendor pages and from vendor-run AWS Marketplace listings checked in October 2026. No paid placement.
Once the inventory exists, the AI usage monitoring guide covers the running log, the AI data loss prevention guide covers the block-or-redact decision on each prompt, and AI governance tools covers policy and risk registers. This page is the discovery cut: what exists, who uses it, and which plane finds it.
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 |
|---|---|---|---|
| Netskope | Custom quote | n/a | Mixed estates that want one control point for discovery, coaching, redaction and blocking. |
| Microsoft Purview | From $12/user/mo over E3 | n/a | Microsoft 365 E3 shops that want discovery and controls inside the stack they already run. |
| Harmonic Security | $163/user/yr (AWS listing) | n/a | Browser-heavy workforces that want a focused discovery-to-coaching tool without a network project. |
| Prompt Security | Custom quote | n/a | Teams that want redaction and coaching on browser, desktop and code assistants, especially if SentinelOne is already the endpoint vendor. |
| Reco | From $18,000/yr (AWS listing) | n/a | Companies where the unknowns are AI features inside SaaS and agents connected by OAuth, not chatbot tabs. |
| Cloudflare | Free under 50 users; $7/user/mo | 4.379 reviews | Small teams and proof-of-concept runs that want a first network-plane shadow AI report at no cost. |
| LayerX (Akamai Workforce Protector) | $8.50/user/mo (AWS listing) | n/a | Teams that want a per-user browser control and are comfortable buying from Akamai during the transition. |
| Nightfall AI | Custom quote | n/a | Security teams that want data movement controls on endpoints, with shadow AI as one of the channels. |
| Torii | Custom quote | 4.5303 reviews | IT teams that want the identity, finance and OAuth view of AI sprawl, with owners and renewal workflows. |
| Zylo | Custom quote | 4.851 reviews | Finance and procurement teams that own the SaaS system of record and want AI purchases visible. |
Mixed estates that want one control point for discovery, coaching, redaction and blocking.
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
Microsoft 365 E3 shops that want discovery and controls inside the stack they already run.
The custom pay-as-you-go option offers flexibility for broader data governance beyond M365.
Browser-heavy workforces that want a focused discovery-to-coaching tool without a network project.
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 want redaction and coaching on browser, desktop and code assistants, especially if SentinelOne is already the endpoint vendor.
Companies where the unknowns are AI features inside SaaS and agents connected by OAuth, not chatbot tabs.
Reco only offers custom quotes with no public pricing, which is typical for enterprise security platforms but leaves buyers without a baseline for comparison.
Small teams and proof-of-concept runs that want a first network-plane shadow AI report at no cost.
Cloudflare's Free plan is the most generous in the CDN industry, unlimited bandwidth, DDoS protection, and a global CDN at $0.
Teams that want a per-user browser control and are comfortable buying from Akamai during the transition.
LayerX sells only a Custom quote tier with no published dollar amount, which is standard for enterprise browser security but leaves smaller buyers without a benchmark.
Security teams that want data movement controls on endpoints, with shadow AI as one of the channels.
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.
IT teams that want the identity, finance and OAuth view of AI sprawl, with owners and renewal workflows.
Torii's pricing model, based on custom quotes for both its IGA and SMP offerings, suggests an enterprise-focused solution.
Finance and procurement teams that own the SaaS system of record and want AI purchases visible.
Zylo's pricing is opaque, relying on 'Contact Sales' for all tiers, which typically indicates enterprise-level pricing that can be expensive.
Watch out
Implementation and onboarding fees
What shadow AI detection is, and where it stops
Shadow AI detection finds AI use that nobody approved, scores the risk, and applies a policy to it. The AI in question is wider than chatbots on personal accounts. It includes AI browser extensions, coding assistants, AI features switched on inside software you already pay for, and agents or MCP servers that a team connected through an OAuth grant.
Three jobs sit inside the category: discover (what exists and who uses it), assess (which apps train on your data, where the vendor sits, how it scores on a risk catalog), and enforce (coach the employee, redact the sensitive detail, or block the app). Microsoft's own deployment guide for this problem follows the same order: discover AI apps, block access to unsanctioned apps, block sensitive data going to sanctioned apps, then govern the data sent.
Detection stops where adjacent products start. A running per-employee log is usage monitoring. A per-prompt block-or-allow decision is AI data loss prevention. A risk register and policy library is AI governance. Several vendors on this page sell all of those, so the useful question is which plane the tool uses to find things in the first place.
Why a block list of chatbots misses most of it
Netskope's generative AI cloud and threat report states that most genAI use in the enterprise (72%) is shadow IT, driven by individuals using personal accounts. The same report says 75% of users use apps that incorporate genAI features, while genAI apps themselves are used by 4.9% of users. A list of blocked chatbot domains covers the small slice and misses the rest.
Spend is a second blind spot. Zylo's January 2026 index says expense-based SaaS spend rose 267% year over year and that ChatGPT is now the most expensed application, which means AI tools are arriving through a company card and never touch procurement.
The steelman for a hard block is real: it is cheap and it is clear. It also does nothing on a personal phone or an unmanaged laptop, and it pushes people to tools you cannot see. That is why Netskope and Prompt Security both lead with coaching and redaction, and why Microsoft puts discovery ahead of blocking. The account matters as much as the app. Approving ChatGPT Enterprise for the company does not approve every personal ChatGPT login, and only a few tools on this page tell the two apart.
Key Features to Look For
Which discovery plane it uses (Essential)
Network tools (Netskope, Cloudflare, Microsoft Global Secure Access) see managed-device traffic. Browser and endpoint tools (Harmonic Security, Prompt Security, LayerX, Nightfall AI) see the prompt and the account. Identity and spend tools (Reco, Torii, Zylo) see logins, OAuth grants and card charges. Ask which plane finds each of your ten largest unknowns.
Personal versus corporate account (Essential)
Netskope says its control operates at the account instance level, so approving a tool does not approve personal logins. Harmonic Security lists corporate versus personal account tracking on its Explore tier. Microsoft Purview groups browser-detected tools such as ChatGPT, Gemini and consumer Copilot in an 'Other AI apps' bucket. A tool that cannot make this split treats a risky login and a sanctioned one as the same row.
Catalog and risk score (Essential)
Vendors count differently: Harmonic cites 10,000+ apps, Prompt Security 15,000+ AI tools, Netskope 1,800+ AI apps inspected inline. Microsoft's Defender for Cloud Apps catalog scores each app from 0 to 10, with 10 the best. Treat the counts as marketing and ask for the matched number from a pilot on your own traffic.
An enforcement ladder, not a switch (Essential)
The useful range is coach, redact, then block. Netskope offers real-time coaching and redaction that lets a task through. Harmonic's Guide tier warns, nudges or blocks inline. Prompt Security redacts PII and secrets before a prompt leaves the device. Akamai Workforce Protector can warn, redact, block or guide. A block-only tool forces a yes or no on every app.
AI inside sanctioned SaaS, agents and MCP servers (Important)
Reco says it discovers agents across Copilot, ChatGPT, Claude, Agentforce, Make and n8n. Torii reads OAuth grants. Microsoft Global Secure Access flags SaaS MCP servers and AI model provider APIs. Nightfall Premier adds MCP server discovery with shadow-MCP detection. This is the layer a chatbot block list never sees.
Approval states and ownership (Important)
Cloudflare's Shadow IT Report tags each AI app Approved, Unapproved or In Review. Microsoft tags apps Sanctioned or Unsanctioned and blocks the latter on Defender for Endpoint devices. Reco assigns an owner to each risky tool. Without states and owners, the inventory is a spreadsheet that goes stale.
Deployment footprint (Important)
A browser extension (Harmonic, LayerX, Prompt Security) rolls out through MDM without a network change. An inline proxy (Netskope, Cloudflare) needs traffic steering. Nightfall's endpoint agent covers browser, desktop apps, clipboard, USB and CLI, and each user license includes two devices. Match the footprint to who owns your endpoints.
Spend and license context (Nice to have)
Zylo and Torii add who paid, which department owns the app and what it costs, and Torii tracks token consumption by department. That context turns a finding into a decision about keep, replace or block.
What to weigh before you pick a discovery plane
Start from the blind spot you can least afford: unmanaged devices, AI inside SaaS, or paid tools on cards, because no single plane covers all three.
Check which module carries AI visibility when pricing is modular, since Netskope's public price list splits Inline CASB and Inline SWG into separate lines.
Decide whether the browser extension is acceptable to your works council or privacy team before the pilot, because it reads prompts.
If you run Microsoft 365 E3 already, price the $12 Purview Suite add-on against a specialist before buying a second platform.
Ask each vendor how a new AI app enters the catalog, and how long that takes, because the catalog is only current if the process is fast.
Evaluation Checklist
Run two vendors in parallel on the same 100 users for 30 days in monitor-only mode, and compare the AI apps each one found that the other missed.
Ask each vendor to show an AI feature inside a SaaS app you already pay for, and an OAuth-connected agent.
Open a personal ChatGPT session and a corporate one on the same device, and confirm the tool tells them apart.
Trigger a coaching message, a redaction and a block, and read the wording the employee sees.
Add a new AI app to a test machine and time how long it takes to appear in the catalog.
Confirm which pricing line or module carries AI discovery, and get it in writing.
Check Mac, mobile and unmanaged device coverage before you accept a coverage percentage.
Pricing Overview
Free or pay-as-you-go to find the problem
Cloudflare One is free for teams under 50 users and $7 per user per month above that, so a small team can get a first shadow AI report this week without a procurement cycle.
$0 to $7 per user per month
Published per-user price
Microsoft Purview Suite ($12 over E3), the LayerX listing ($8.50, 50-user minimum) and Harmonic Security ($163 a year, 200-user minimum) let a CISO budget before a call.
$8.50 per user per month to $163 per user per year
Flat or per-100-user contract
Reco's AWS tiers are $18,000 and $90,000 a year, and Netskope Inline CASB is $34,831 a year per 100 users. These fit teams that buy a platform rather than a seat count.
$18,000 to $34,831 a year to start
Quote only
Prompt Security, Nightfall AI, Torii and Zylo publish no price, so budget a demo and a pilot before a number appears.
Custom
Pricing Comparison
| Tool | Discovery plane | Published price | Acts by |
|---|---|---|---|
Netskope | Network inline, plus endpoint | $34,831 per 100 users per year (Inline CASB, AWS listing) | Coach, redact, block |
Cloud app catalog, Entra network, endpoint, browser | $12 per user per month, paid yearly, over E3 | Unsanction and block, endpoint DLP warn or block | |
Browser extension, desktop telemetry | $163 per user per year, 200-user minimum (AWS listing) | Warn, nudge, block | |
Browser, desktop, code assistants | Custom quote | Redact, coach, enforce policy | |
Reco | SSO logs, OAuth, email metadata | $18,000 or $90,000 per year (AWS listing) | Tag owners, revoke access |
Cloudflare | Network, Gateway | Free under 50 users, then $7 per user per month | Block Unapproved apps, DLP on prompts |
Browser extension | $8.50 per user per month, 50-user minimum (AWS listing) | Warn, redact, block, guide | |
Endpoint agent, browser, SaaS | Custom quote | Redact, coach, block, quarantine | |
Torii | Identity, finance, browser extension, OAuth grants | Custom quote | Access reviews, automations |
Zylo | Finance systems (ERP, AP, expense) | Custom quote | IAM and ITSM workflow actions |
Checked October 2026 on vendor pages: Netskope AI security and Netskope AWS listing, Microsoft Purview Suite pricing, Harmonic pricing and Harmonic AWS listing, SentinelOne AI Usage Control, Reco discovery and Reco AWS listing, Cloudflare plans, Akamai Workforce Protector and LayerX AWS listing, Nightfall pricing, Torii, Zylo pricing.
Mistakes to Avoid
- ×
Counting catalog size as coverage. Harmonic cites 10,000+ apps, Prompt Security 15,000+ tools and Netskope 1,800+ inline AI apps, and those are three different definitions.
- ×
Approving a tool company-wide and assuming personal logins are covered, when Netskope's report puts 72% of genAI use in shadow IT through personal accounts.
- ×
Blocking the top five chatbots and calling it done, while Netskope's report says 75% of users use apps with genAI features built in.
- ×
- ×
Pricing Netskope Inline CASB at $34,831 per 100 users without checking whether the web gateway at $64,363 is also needed for the visibility you want.
- ×
Starting with a block. Microsoft's own order is discover, block unsanctioned apps, protect sensitive data in sanctioned apps, then govern. Skipping the first step blocks tools nobody uses and misses the ones everyone does.
Expert Tips
- →
Run discovery in monitor-only mode for 30 days, then sort the list into three buckets: approved, tolerated with coaching, and blocked. Cloudflare's Approved, In Review and Unapproved states map to exactly that.
- →
Pair one traffic-plane tool with one identity-plane tool. The first catches chat tabs and the second catches AI inside SaaS and agent grants.
- →
Write coaching text that names the approved alternative. Netskope says its coaching points to the approved option, and that is what keeps people from routing around it.
- →
Pull AI charges from the expense system before you buy anything. Zylo says ChatGPT is now the most expensed app, so a finance export is a free first inventory.
- →
Track MCP servers and agents as their own inventory line. Microsoft Global Secure Access, Netskope's endpoint visibility and Nightfall Premier all list them.
- →
Under 50 people, test the network plane on Cloudflare's free plan before you open a procurement ticket.
Red Flags to Watch For
- !
A demo that shows ChatGPT and Gemini but no AI feature inside a SaaS app you own.
- !
A catalog number with no method for how new apps enter it, or how fast.
- !
Coaching and redaction promised in the deck while the tier you can afford only allows or blocks.
- !
A modular price that never says which module carries AI visibility.
- !
No answer to how the tool separates personal accounts from corporate ones.
The Bottom Line
Start with Netskope if you need one control point for a mixed estate, or Microsoft Purview if Microsoft 365 E3 is already your base. Add Harmonic Security or Prompt Security when employees live in the browser, and Reco when AI shows up inside SaaS and agent connections. Use Cloudflare to test the network plane free, and Zylo or Torii when finance owns the problem. Run discovery in monitor-only mode for 30 days, then choose the enforcement tier from what you actually found.
Frequently Asked Questions
What is the best shadow AI detection tool in 2026?
Netskope is the best default for a mixed estate in 2026. Netskope says its inline inspection covers 1,800+ AI apps, tells corporate accounts from personal ones, and supports coaching, redaction and blocking. Microsoft Purview is the pick for Microsoft 365 E3 shops at $12 per user per month. Harmonic Security and Prompt Security are the browser-first specialists, and Reco is the pick when AI hides inside SaaS.
What is shadow AI detection, and how is it different from DLP?
Shadow AI detection finds AI use nobody approved, scores the risk and applies policy. DLP decides whether a given prompt or file may leave. Detection answers what exists and who uses it, and DLP answers whether this one prompt should be blocked. Several tools here, including Netskope, Nightfall AI and Microsoft Purview, sell both.
How much does shadow AI detection cost?
Published prices in October 2026 range from free to $163 per user per year. Cloudflare is free under 50 users and $7 per user per month above that. Microsoft Purview Suite is $12 per user per month over E3. LayerX's listing is $8.50 per user per month with a 50-user minimum, Harmonic's is $163 per user per year with a 200-user minimum, and Reco's AWS tiers are $18,000 and $90,000 a year. Prompt Security, Nightfall AI, Torii and Zylo are quote only.
Is there a free shadow AI detection tool?
Cloudflare One has a free plan for teams under 50 users, and its Shadow IT Report can be filtered to AI apps. Nudge Security publishes a free trial on its Essential plan, which is $750 a month billed annually for up to 150 users. Enterprise tools such as Netskope, Harmonic and Reco have no free plan.
How do tools actually detect shadow AI?
They use three signals. Network tools such as Netskope, Cloudflare and Microsoft Global Secure Access read traffic and match it to an app catalog. Browser and endpoint tools such as Harmonic, Prompt Security and LayerX see the prompt and the account on the device. Identity and spend tools such as Reco, Torii and Zylo read SSO logs, OAuth grants and expense data. Each signal misses what the others catch.
What about Zscaler, Palo Alto Networks, Nudge Security and Grip Security?
All four are credible and none is ranked here because none has a Toolradar profile yet. Zscaler's page lists AI app visibility, prompt blocking and a browser isolation mode that restricts cut, paste and download. Palo Alto Networks sells AI Access Security within its Prisma SASE line. Nudge Security publishes $750 a month billed annually for up to 150 users and $5 per user per month billed annually for 150 to 1,500 users. Grip Security lists shadow AI discovery within its SaaS and AI security platform.
Should we block ChatGPT?
Block the unsanctioned apps your discovery shows nobody needs, and coach on the rest. A block does nothing on a personal phone and pushes use out of sight. Netskope and Prompt Security both lead with coaching and redaction, and Microsoft's deployment order puts discovery ahead of blocking.
Cite this page: Toolradar, "Best Shadow AI Detection Tools in 2026", updated October 2026, https://toolradar.com/guides/best-shadow-ai-detection-tools