Prompt Security, now part of SentinelOne, covers employee AI use, code assistants, MCP agents and AI applications companies build. AILeakShield focuses on employee AI governance and adds Microsoft 365 AI app governance, firewall enforcement, a NIST AI RMF assessment and staff policy acknowledgment.
What Prompt Security is: Prompt Security, a SentinelOne company: AI usage control, agentic AI security and AI application security, sold as part of the SentinelOne Singularity Platform. SentinelOne completed the acquisition on September 5, 2025.
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 | Prompt Security (SentinelOne) |
|---|---|---|
| Discover | ||
| AI websites used in the browser | YesBrowser extension for Chrome, Edge and Firefox with a risk-ranked AI catalog. | YesInventories AI tools and code assistants across 15,000+ AI services. |
| 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). | YesEndpoint agent discovers desktop AI apps and code assistants. |
| 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. | YesDiscovers MCP servers and agent deployments; MCP Gateway. |
| 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. | YesSanction approved tools and block the rest. |
| 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. | YesInspects and redacts prompts inline before they leave the device. |
| Inspect files uploaded to AI | YesFiles attached to AI prompts are inspected before send. | Not documentedFile upload inspection not found on vendor pages. |
| Warn and require a typed justification | YesCoached warning; the reason is recorded in the audit log. | Not documentedCoaching documented; a typed justification flow was not found. |
| Mask or redact sensitive values | PartialMasking is available in the AILeakShield secure AI workspace; on third-party AI sites the extension warns or blocks. | YesRedaction and anonymization of sensitive data. |
| Custom sensitive terms | YesCustomer-defined terms such as project names and client lists. | PartialCustom role-based policies and guardrails; customer keyword lists not documented. |
| Comply | ||
| Built-in NIST AI RMF assessment | YesIncluded in every subscription. | Not documentedNo NIST AI RMF assessment found. |
| 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 requiredBrowser extension and an AI endpoint agent; no proxy required. |
| Multi-tenant console for MSPs | YesPartner console with per-client isolation and policy templates. | PartialMSSP multi-tenancy announced in 2024; SentinelOne offers multi-tenant management. |
Prompt Security: Prompt Security uses a browser extension and an AI endpoint agent, with an API and SDK for homegrown applications and an MCP gateway. It is sold through SentinelOne as part of the Singularity Platform. 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 Harmonic · AILeakShield vs Nightfall · AILeakShield vs Cyberhaven
For employee AI use, yes. Prompt Security, now part of SentinelOne, also secures AI applications companies build. AILeakShield focuses on employee AI and adds Microsoft 365 AI app governance and compliance evidence.
No. AILeakShield works on its own and alongside any endpoint security product.
Yes. Files attached to AI prompts are inspected before they are sent.
From Prompt Security (SentinelOne)'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.
