Harmonic Security protects data in AI tools using small language models for context-aware detection. AILeakShield covers the same browser and prompt use cases and adds Microsoft 365 AI app governance, firewall blocklist enforcement, a NIST AI RMF assessment and a console built for IT providers.
What Harmonic is: Generative AI data protection and AI usage control using small language models, across browser, desktop and MCP agents.
Yes means documented. Partial means limited, an add-on, a separate product or preview. Not documented means we could not find it in the vendor's public documentation; it does not mean the vendor has tested and failed it.
| Capability | AILeakShield | Harmonic Security |
|---|---|---|
| Discover | ||
| AI websites used in the browser | YesBrowser extension for Chrome, Edge and Firefox with a risk-ranked AI catalog. | YesPrompt-level visibility across 1,000+ applications with risk scores. |
| Desktop AI apps and coding tools | YesFirewall and DNS log import, plus RMM software inventory for MSPs (NinjaOne; ConnectWise, Datto, Kaseya and N-able in beta). | YesProtect Agent reports desktop AI use on Windows, macOS and Linux (Guide tier and above). |
| AI apps connected to Microsoft 365 (OAuth) | YesRead-only Microsoft 365 connection lists AI apps users or admins have consented to. | Not documentedMicrosoft 365 OAuth app discovery not found in public documentation. |
| AI agents | YesAI agent tools on desktops and AI agents connected to Microsoft 365, such as meeting bots. | YesMCP client and server discovery and a local MCP Gateway (Command tier). |
| Control | ||
| Block or restrict unapproved AI tools | YesIn the browser, through a firewall blocklist feed (Palo Alto EDL, FortiGate, pfBlockerNG, RPZ) and in Microsoft 365 consent. | YesApp Access outcomes of Allow, Advise and Block. |
| Revoke AI app access in Microsoft 365 | YesAudited revoke of an AI app's Microsoft 365 grants. | Not documentedMicrosoft 365 OAuth grant revocation not found in public documentation. |
| Protect | ||
| Inspect prompts for sensitive data | YesTyped and pasted prompt text, inspected before it is sent. | YesSmall language models evaluate prompts in real time. |
| Inspect files uploaded to AI | YesFiles attached to AI prompts are inspected before send. | YesSensitive file uploads detected and blockable, per a 2025 product blog. |
| Warn and require a typed justification | YesCoached warning; the reason is recorded in the audit log. | YesWarnings can require a justification. |
| Mask or redact sensitive values | PartialMasking is available in the AILeakShield secure AI workspace; on third-party AI sites the extension warns or blocks. | Not documentedRedaction not found in public documentation. |
| Custom sensitive terms | YesCustomer-defined terms such as project names and client lists. | PartialCustom detection types mentioned; setup not documented publicly. |
| Comply | ||
| Built-in NIST AI RMF assessment | YesIncluded in every subscription. | Not documentedMaps detections to NIST SP 800-53, not an AI RMF assessment. |
| AI policy library with staff acknowledgment | YesIndustry policy library with tracked staff acknowledgment. | Not documentedNo AI policy library with staff acknowledgment found. |
| Deploy and buy | ||
| No proxy, SSE or new browser required | Not requiredBrowser extension in the browsers staff already use, plus log import and a Microsoft 365 connection. | Not requiredManaged browser extension, plus a Protect Agent for desktop and a local MCP Gateway. |
| Multi-tenant console for MSPs | YesPartner console with per-client isolation and policy templates. | PartialPartner program accepts MSSPs and resellers; multi-tenant console not described. |
Harmonic: Harmonic deploys a managed browser extension through Intune, Jamf, Kandji or Group Policy; desktop coverage needs the Protect Agent and MCP coverage needs the local MCP Gateway. Features are tiered (Explore, Guide, Command). Prices are not published.
AILeakShield: A browser extension for Chrome, Edge and Firefox, installed silently through Google Admin, Microsoft Intune, Group Policy or Jamf, plus firewall and DNS log import and an optional read-only Microsoft 365 connection. No proxy, no TLS inspection and no new browser. Everything is in one subscription, sold through IT providers and distribution including TD SYNNEX, with no seat minimum. Most organizations start in monitor mode.
More comparisons: All comparisons · AILeakShield vs Microsoft Purview · AILeakShield vs Netskope · AILeakShield vs Zscaler · AILeakShield vs Palo Alto Networks · AILeakShield vs Cisco · AILeakShield vs Check Point · AILeakShield vs Island · AILeakShield vs Akamai (LayerX) · AILeakShield vs Prompt Security · AILeakShield vs Nightfall · AILeakShield vs Cyberhaven
Yes. Both inspect AI prompts in the browser and coach users. AILeakShield adds Microsoft 365 AI app governance, a firewall blocklist feed, a NIST AI RMF assessment and staff policy acknowledgment.
No. AILeakShield finds desktop AI apps and coding tools through firewall and DNS log import, or through the RMM an IT provider already runs.
With pattern and validation rules for structured data such as card numbers, credentials and identifiers, entity recognition for names and other personal data, and customer-defined terms.
From Harmonic Security's public documentation and product pages, last checked October 21, 2026, with sources linked on this page. Where we could not find a capability documented, we say so rather than claiming it is missing. Vendors can contact us with corrections.
AILeakShield discovers all the AI in your environment, blocks the AI tools you have not approved, and keeps sensitive data out of the prompts sent to the ones you have.
