Is Prompt Security or Zscaler better for AI endpoint control?

Neither is scored on this site. Prompt Security describes 2 of four product control types and Zscaler 1 on the pages we read, and they differ on 7 recorded facts. Which fits depends on the AI tools people use, your devices, where the work happens and whether you block or guide; the finder checks those.

Which of the two decides on a tool call before it runs?

Prompt Security: Not in our sources. Zscaler: Not in our sources. Warn or ask: Prompt Security Not in our sources, Zscaler Not in our sources.

Do Prompt Security or Zscaler publish prices?

Prompt Security: Not published. Zscaler: Not published (demo request).

HEAD-TO-HEAD · FACTS ONLY

Prompt Security vs Zscaler: AI endpoint control facts side by side

Short answer

Prompt Security describes 2 of the four product control types on the pages we read and Zscaler describes 1; they differ on on-device control, browser extension and network or SSE proxy. On decisions, Prompt Security does not describe tool-call decisions on the pages we read and Zscaler does not describe tool-call decisions on the pages we read. We do not score either; the right choice depends on the AI tools people use, your devices, your current stack and whether you block or guide.

By The Device Desk · Endpoint AI Finder · Published 2026-10-11

Desk research from public vendor pages read on 27 September and 11 October 2026. Profiles follow our published method; we did not run the products.

Vendor pages read September and October 2026 · updated 2026-10-13

Where do their controls sit?

Filled or hatched marker: Prompt Security
Dashed teal ring: Zscaler, described

DEV Filled marker: described on the product pages we read
DEV Hatched marker: partly described (another component, a narrower scope, or method not detailed)
DEV Dashed marker: not in our sources (it may exist; we did not find it)

The map shows where each product's own pages describe a control, or where your answers point. It is not a measure of how well a product works.

What are the facts, side by side?

Prompt Security (SentinelOne) and Zscaler Generative AI Security, from each product's own pages. Differs is computed from recorded statuses, not wording.
Fact	Prompt Security	Zscaler
Owner	SentinelOne (acquisition announced 5 August 2025; SentinelOne's blog of 3 September 2025 is titled SentinelOne Acquires Prompt Security)	None
Positioning	Prompt Security, now part of SentinelOne, inventories AI tools and code assistants, including unsanctioned shadow AI, through two local sensors, a browser extension and a dedicated AI endpoint agent, and is built into the SentinelOne Singularity Platform.	Zscaler's controls for employee use of generative AI: prompt-level visibility, allow or block by app, DLP blocking across GenAI apps, browser isolation that disables cut, paste and download, and data security for Microsoft Copilot.
How it reaches devices	Two local sensors: a browser extension and a dedicated AI endpoint agent, managed from the SentinelOne Singularity Platform. Prompt Security argues that MDM or EDR integrations, which mostly run scripts periodically, are not enough. Source: Prompt Security blog: browser and endpoint sensors · Read 11 Oct 2026	Delivered with Zscaler's cloud security service in the network path; endpoint agents are not described on the page we read. Source: Zscaler: Secure the use of generative AI · Read 11 Oct 2026
On-device controlDiffers	DescribedA dedicated AI endpoint agent detects new AI agents, skills and connectors and applies runtime policies; it names GitHub Copilot, Cursor and Claude Code among the code assistants it inventories. Source: Prompt Security blog: browser and endpoint sensors · Read 11 Oct 2026	Not in our sourcesNot described on the pages we read.
Browser extensionDiffers	DescribedA browser extension inspects prompts, redacts sensitive data and discovers shadow AI. Source: Prompt Security blog: browser and endpoint sensors · Read 11 Oct 2026	Not in our sourcesNot described on the pages we read.
Network or SSE proxyDiffers	Not in our sourcesNot described on the pages we read.	DescribedSee all input prompts users send to apps, allow or block apps, block sensitive data with DLP across GenAI, and isolate the browser to disable cut, paste and download. Source: Zscaler: Secure the use of generative AI · Read 11 Oct 2026
AI or MCP gateway	Not in our sourcesNot described on the pages we read.	Not in our sourcesNot described on the pages we read.
Names the coding agents it coversDiffers	MatchesNames GitHub Copilot, Cursor and Claude Code. Source: SentinelOne: Prompt Security · Read 27 Sep 2026	Not in our sources
Decides on a tool call before it runs	Not in our sources	Not in our sources
Controls what goes into browser AI	MatchesThe browser extension inspects prompts and redacts sensitive data. Source: Prompt Security blog: browser and endpoint sensors · Read 11 Oct 2026	MatchesPrompt-level visibility, DLP blocking across GenAI apps, and browser isolation that disables cut, paste and download. Source: Zscaler: Secure the use of generative AI · Read 11 Oct 2026
Rolls out through EDR or device management you runDiffers	PartlyIts own agent and extension, managed in the SentinelOne console; it does not ride on other EDR or MDM tools. Source: Prompt Security blog: browser and endpoint sensors · Read 11 Oct 2026	Not in our sources
Can warn or ask instead of only blocking	Not in our sources	Not in our sources
Can block an agent, tool or actionDiffers	Not in our sources	MatchesAllow or block GenAI apps, and block sensitive data with DLP. Source: Zscaler: Secure the use of generative AI · Read 11 Oct 2026
Has a watch-only or simulation mode	Not in our sources	Not in our sources
Records who or what took each action	Not in our sources	Not in our sources
Also covers SaaS, cloud or homegrown AIDiffers	MatchesCovers homegrown AI apps from testing to runtime. Source: SentinelOne: Prompt Security · Read 27 Sep 2026	PartlyData security for Microsoft Copilot, including misconfigurations. Source: Zscaler: Secure the use of generative AI · Read 11 Oct 2026
Has a public price or tiers (vendor site or marketplace)	Not in our sources	Not in our sources
Built into	Built into the SentinelOne Singularity Platform. Source: SentinelOne: Prompt Security · Read 27 Sep 2026	None
Works with	None in our sources	None in our sources
Price	Not published. Source: SentinelOne: Prompt Security · Read 27 Sep 2026	Not published (demo request). Source: Zscaler: Secure the use of generative AI · Read 11 Oct 2026

Where do they differ?

On-device control: Prompt Security describes it; Zscaler is not in our sources.
Browser extension: Prompt Security describes it; Zscaler is not in our sources.
Network or SSE proxy: Prompt Security is not in our sources; Zscaler describes it.
Names the coding agents it covers: Prompt Security matches; Zscaler is not in our sources.
Rolls out through EDR or device management you run: Prompt Security partly matches; Zscaler is not in our sources.
Can block an agent, tool or action: Prompt Security is not in our sources; Zscaler matches.
Also covers SaaS, cloud or homegrown AI: Prompt Security matches; Zscaler partly matches.

Choose Prompt Security if

You already run SentinelOne Singularity
You need an inventory of AI tools and coding assistants first

Choose Zscaler if

You already route traffic through Zscaler and want GenAI controls there
Your main risk is sensitive data pasted or uploaded into GenAI web apps

Which limits should you check?

Prompt Security

Two new local sensors to roll out, a browser extension and an endpoint agent, unless you already run SentinelOne.
Tool-call decisions, blocking, warning and activity records for agent actions are not described on the pages we read, and no pricing is published.

Zscaler

Coding agents, MCP servers and local agent actions are not described on the page we read.
Warn or ask responses are not described, and no pricing is published.

Line up Prompt Security and Zscaler with others Run the finder