Prompt Security
Inline LLM application security gateway
Overview
Prompt Security deploys as a transparent gateway in front of LLM applications, inspecting prompts and responses for injection, data leakage, abuse and policy violations. Strong fit for enterprises rolling out internal copilots.
Use cases
What you can produce with Prompt Security
- Deploy the gateway in front of an internal LLM application and have every prompt and response inspected for prompt-injection attempts, jailbreaks and policy violations without changing application code.
- Automatically redact PII, credentials and other sensitive data from employee prompts before they ever reach ChatGPT, Copilot or another external AI tool.
- Get a live inventory of shadow AI across the organisation, seeing which unsanctioned GenAI tools employees are actually using and what data flows into them.
- Write granular usage policies — for example blocking source code uploads to consumer chatbots while allowing sanctioned enterprise tools — and enforce them in real time.
- Scan LLM responses on the way out to block data leakage, toxic content or hallucinated sensitive information before it reaches the end user.
- Protect homegrown AI agents and copilots against abuse such as denial-of-wallet attacks and tool-misuse patterns at runtime.
- Feed AI-usage security events into SentinelOne's Singularity platform so GenAI incidents appear alongside endpoint and cloud detections.
ASEAN Perspective
Prompt Security in Southeast Asia
ASEAN-region availability and pricing notes coming soon. Drop the editorial team a note via /contact/ if you can supply local context (Singapore/Malaysia/Indonesia/Thailand/Vietnam).
Prompt Security is a pioneer in securing generative and agentic AI at runtime, giving organisations visibility into how employees and apps use AI, what data is being shared, and enforcement against prompt injection, sensitive-data leakage and misuse. It was acquired by SentinelOne in September 2025 and is being integrated into the Singularity platform, which validates the technology but means the standalone product is being absorbed into a larger suite.
It suits enterprises that need GenAI governance and runtime DLP across employee tools and homegrown AI apps. Caveats: as part of SentinelOne, standalone availability, pricing and roadmap are in transition (best evaluated within Singularity going forward), it is enterprise-only with sales-led onboarding, and there is no transparent pricing. ASEAN readiness follows SentinelOne's global enterprise footprint, which is broad, but expect bundled procurement rather than a quick self-serve start.
What people say
Prompt Security was acquired by SentinelOne in a deal announced on August 5, 2025 and completed on September 5, 2025, valued at roughly $250 million in cash and stock. The product line continues under SentinelOne, where it anchors the company's generative-AI and agent-security strategy within the Singularity platform. Buyers evaluating it today are effectively evaluating a SentinelOne product, which changes the procurement calculus — a plus for existing SentinelOne customers, a consideration for shops standardised on rival platforms.
User feedback, while not voluminous, is notably positive. Gartner Peer Insights carries around 22 reviews of Prompt Security, and G2 reviewers describe a familiar before-and-after story: before deployment they had zero visibility into shadow AI — employees pasting sensitive data into ChatGPT or code assistants with no oversight — and afterwards they had real-time monitoring, policy enforcement, and automatic data redaction across those interactions. Reviewers consistently call out smooth deployment and a minimal learning curve, which matters for a product that sits inline in front of production LLM traffic. The gateway architecture is the core appeal: it inspects prompts and responses for injection attempts, data leakage and policy violations without requiring code changes in each application it protects.
The caveats are mostly structural rather than complaints about the product itself. The public review base is still small compared with mature security categories, PeerSpot notes its mindshare in generative-AI security slipped year-over-year as the category crowded with competitors (including Palo Alto's Prisma AIRS), and inline gateways inherently add a latency and availability dependency that security architects must plan around.
Prompt Security fits mid-size to large enterprises rolling out internal copilots or employee GenAI access who need guardrails quickly — and it is an especially natural pick for organisations already running SentinelOne, where it now slots into a broader detection-and-response stack.
Summary of public user & expert reviews, compiled by RECATOOLS.
About this listing
This entry was compiled from publicly available data including Prompt Security's official website, press releases, documentation, and reputable third-party publications. RECATOOLS is not affiliated with Prompt Security unless explicitly stated.
Third-party AI tools update their pricing, features, availability, and policies frequently. Information here may be outdated by the time you read this — we make reasonable efforts to keep listings current, but cannot guarantee absolute accuracy.
For the latest details, please refer to Prompt Security directly →
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