Comparison
ShadowLock vs DefensX
DefensX guards the managed browser. ShadowLock guards three layers - Windows endpoint, browser, and Microsoft 365 tenant - including everywhere DefensX can't see.
DefensX details last verified · sources
DefensX is a browser-security suite that added shadow AI features. ShadowLock is a shadow AI control built across three layers: endpoint clipboard, managed browser, and M365 tenant via Microsoft Graph. The moment your shadow AI strategy moves past “block the browser tab,” you need more than one layer.
Comparing more than these two? See the full DefensX alternatives roundup.
of AI interactions involve sensitive dataCyberhaven Labs, 2026 ↗
DefensX governs which sites and sessions employees can reach, and its own documentation describes in-browser prompt inspection with PII redaction. Access control and content classification are still different jobs, and Cyberhaven puts sensitive data in roughly two of every five AI interactions. ShadowLock classifies every paste at the clipboard (Shannon entropy, Luhn, tiered confidence) before it reaches an AI tool you have allowed, including pastes into desktop apps that never touch a browser.
Head to head
Side by side
The browser-extension blind spot
An employee opens an unmanaged Edge profile, installs the ChatGPT desktop app, or copies a customer record from your CRM and pastes it into Claude on their phone via Continuity. DefensX's browser extension doesn't see any of that. Its enforcement happens inside the tab.
ShadowLock's clipboard monitor runs as a Windows service. It sees every paste regardless of which app is receiving it, runs entropy + Luhn classification locally, and blocks at paste time. That's the only architecture that holds when shadow AI moves outside the browser - which, for most shops, is already happening.
The data-sharing toggle nobody else enforces
Most AI tools default to training on your conversations, and the opt-out is buried in settings. ShadowLock reads each provider's actual setting on every session and blocks prompts until it reads off - then releases automatically, across every open tab, the moment someone turns it off. That's verification, not a request you hope was followed.
DefensX ships a "Block Model Improvement Settings" control, but its own documentation describes instructing the user to change the setting rather than confirming or changing it. For a compliance story - proving your data wasn't fed into a third-party model - reading and gating on the real state is the difference between evidence and an honor system.
Fit
Which one fits your situation?
Choose ShadowLock when…
- You need shadow AI coverage outside the managed browser - desktop AI apps, unmanaged browsers, or any paste from anywhere.
- You want visibility into M365 Copilot plugins and third-party AI add-ins consented in your tenant.
- Your procurement team wants a per-device price they can get without a sales call and model against renewal economics.
- You need clipboard-level data classification for HIPAA, SOC 2, or GDPR - not just in-browser regex redaction.
- You need to prove the "train on my data" setting is off on every AI tool - and block prompts until it is, not just ask employees to flip it.
DefensX still fits if…
- You can mandate the DefensX-managed browser on every endpoint and disable everything else.
- You buy primarily through Pax8 or Sherweb and want the marketplace co-sell motion.
FAQ
Frequently asked questions
Can ShadowLock and DefensX run on the same endpoint?
Yes. A browser extension and an endpoint agent don't conflict. Most evaluations pick one based on threat model rather than running both.
Does DefensX cover desktop AI apps?
DefensX describes its platform as three layers: a browser extension, an endpoint agent, and cloud intelligence. Its published AI Data Protection capability is described as inspecting prompts and responses in-browser, and we could not find public documentation of prompt or clipboard classification inside native desktop AI apps. Treat that as undocumented rather than absent, and ask DefensX directly if it matters to your evaluation. ShadowLock classifies clipboard content at the OS layer, so a paste into ChatGPT for Windows is inspected whether or not a browser is involved.
Is ShadowLock cheaper than DefensX?
DefensX prices through distributors with no public per-seat number, so honest dollar comparisons require a quote. ShadowLock is priced per managed device in the same band as MSP DNS filters, below most browser-security suites, and the rate card is emailed on request without a sales call.
Sources and verification
Every competitor claim below links to that vendor’s own public documentation. Where a vendor does not publish an answer, we say so rather than presenting silence as proof. Competitor facts on this page were last checked on . Pricing and features change without notice — verify against the vendor before you buy.
- DefensX product ↗ — DefensX describes a browser extension, endpoint agent, and cloud intelligence layer, with AI Data Protection that inspects prompts and responses in-browser, redacts PII and source code before transmission, and limits or sanitises file uploads to LLMs.
- DefensX: Atlas support ↗ — DefensX announced support for the OpenAI Atlas agentic browser.
- DefensX for MSSPs ↗ — DefensX markets to MSPs and MSSPs but does not publish a per-seat price on its public site.Not publicly documented
One claim on this page rests on the absence of public documentation rather than on a vendor statement. We have written it as “not publicly documented” for that reason. If you represent one of these vendors and we have it wrong, tell us and we will correct it.
Comparisons
Compare ShadowLock to other shadow AI tools
Researching alternatives? Honest side-by-side comparisons against every MSP-channel shadow AI tool.
AI-native XDR with no M365 scanning. We scan the tenant and publish a price.
Blocks AI apps. We inspect the prompt content.
Resolver-layer only. Blind to embedded AI and M365 OAuth.
Browser isolation. We are purpose-built for shadow AI.
Governs shadow AI inside the E5 stack. We need no E5 license.