HEAD-TO-HEAD · FACTS ONLY
Neo vs Prompt Security: AI endpoint control facts side by side
Short answer
Neo describes 1 of the four product control types on the pages we read and Prompt Security describes 2; they differ on browser extension. On decisions, Neo decides on a tool call before it runs and Prompt Security 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: Neo
- Dashed teal ring: Prompt Security, 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)
What are the facts, side by side?
| Fact | Neo | Prompt Security |
|---|---|---|
| Owner | None | SentinelOne (acquisition announced 5 August 2025; SentinelOne's blog of 3 September 2025 is titled SentinelOne Acquires Prompt Security) |
| Positioning | Agentic Software Control from Neo Security, Inc. (neo.ai, not Pulumi Neo): a live inventory of agents, models, skills, MCP servers and extensions on every endpoint, and runtime control that intercepts agent actions and allows, blocks or holds them for approval. Launched 20 July 2026 with $100M from Andreessen Horowitz and Bessemer; HQ Boston. | 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. |
| How it reaches devices | A lightweight endpoint sensor with no kernel module, no reboot and no OS hooks; analysis stays on the device. OS support is not listed on the pages we read; SACR (secondary) says it needs no MDM. Source: Neo: platform · Read 13 Oct 2026 | 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 |
| On-device control | DescribedA live inventory of agents, models, skills, MCP servers and extensions on every endpoint, with runtime control that intercepts agent actions. Source: Neo homepage · Read 13 Oct 2026 | 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 |
| Browser extensionDiffers | Partly described(secondary: SACR) user-mode endpoint and browser security. Source: SACR (secondary): CISO guide to endpoint control and prevention, July 2026 · Read 13 Oct 2026 · secondary source | DescribedA browser extension inspects prompts, redacts sensitive data and discovers shadow AI. Source: Prompt Security blog: browser and endpoint sensors · Read 11 Oct 2026 |
| Network or SSE proxy | Not in our sourcesNot described on the pages we read. | Not in our sourcesNot described on the pages we read. |
| 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 covers | MatchesNames Claude Code, Gemini CLI, GitHub Copilot and OpenAI Codex; Cursor is not named. Source: Neo: platform · Read 13 Oct 2026 | MatchesNames GitHub Copilot, Cursor and Claude Code. Source: SentinelOne: Prompt Security · Read 27 Sep 2026 |
| Decides on a tool call before it runsDiffers | MatchesIntercepts agent actions at the endpoint and allows, blocks or holds them for approval. Source: Neo homepage · Read 13 Oct 2026 | Not in our sources |
| Controls what goes into browser AIDiffers | Not in our sources | MatchesThe browser extension inspects prompts and redacts sensitive data. Source: Prompt Security blog: browser and endpoint sensors · Read 11 Oct 2026 |
| Rolls out through EDR or device management you run | PartlyIts own lightweight sensor rather than a rollout through existing EDR or MDM. Source: Neo: platform · Read 13 Oct 2026 | 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 |
| Can warn or ask instead of only blockingDiffers | MatchesHold an action for verified human approval. Source: Neo: platform · Read 13 Oct 2026 | Not in our sources |
| Can block an agent, tool or actionDiffers | MatchesBlock is one of its runtime actions. Source: Neo: platform · Read 13 Oct 2026 | Not in our sources |
| Has a watch-only or simulation modeDiffers | MatchesAudit mode before enforcement. Source: Neo: platform · Read 13 Oct 2026 | Not in our sources |
| Records who or what took each actionDiffers | MatchesEvery action tied to the human or agent that caused it, in an immutable audit chain. Source: Neo homepage · Read 13 Oct 2026 | Not in our sources |
| Also covers SaaS, cloud or homegrown AIDiffers | PartlyNames SaaS and desktop AI such as Slack AI, Notion AI, Salesforce Agentforce and ChatGPT Desktop. Source: Neo: platform · Read 13 Oct 2026 | MatchesCovers homegrown AI apps from testing to runtime. Source: SentinelOne: Prompt Security · Read 27 Sep 2026 |
| Has a public price or tiers (vendor site or marketplace) | Not in our sources | Not in our sources |
| Built into | None | Built into the SentinelOne Singularity Platform. Source: SentinelOne: Prompt Security · Read 27 Sep 2026 |
| Works with | None in our sources | None in our sources |
| Price | Not published (demo request). Source: Neo homepage · Read 13 Oct 2026 | Not published. Source: SentinelOne: Prompt Security · Read 27 Sep 2026 |
Where do they differ?
- Browser extension: Neo partly describes it; Prompt Security describes it.
- Decides on a tool call before it runs: Neo matches; Prompt Security is not in our sources.
- Controls what goes into browser AI: Neo is not in our sources; Prompt Security matches.
- Can warn or ask instead of only blocking: Neo matches; Prompt Security is not in our sources.
- Can block an agent, tool or action: Neo matches; Prompt Security is not in our sources.
- Has a watch-only or simulation mode: Neo matches; Prompt Security is not in our sources.
- Records who or what took each action: Neo matches; Prompt Security is not in our sources.
- Also covers SaaS, cloud or homegrown AI: Neo partly matches; Prompt Security matches.
Choose Neo if
- You want to hold agent actions for human approval on the device
- You want an audit mode before enforcing rules
Choose Prompt Security if
- You already run SentinelOne Singularity
- You need an inventory of AI tools and coding assistants first
Which limits should you check?
Neo
- Uses its own sensor rather than the EDR or MDM you run, and OS support is not listed on the pages we read.
- No price is published.
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.