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Prompt Inspector

Freemium#25 of 30 in LLM Security Tools

Prompt Inspector: A focused prompt-injection defense layer with flexible deployment and developer tooling. Ranked #25 of 30 in LLM Security Tools by our editors (5.3/10); pricing: Free plan; best for developers focused on prompt-injection detection.

5.3/10Editor score
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At a glance

  • Editor score
    5.3 / 10
  • Pricing
    Free plan
  • Best for
    Developers focused on prompt-injection detection
  • Free plan
    Yes
  • Prompt injection defense
    Yes
  • Facts checked
    21 Sep 2026

  • Where it wins

    • Multi-layer and semantic analysis targets prompt-injection threats
    • Open-source deployment supports cloud API and self-hosted use
    • REST API, SDKs, MCP, and editor integrations support developer workflows

  • Where it doesn't

    • Its verified protection scope is narrower than full runtime guardrail platforms
    • AI review is optional rather than a universal analysis step
    • The product is focused on prompt-injection defense rather than broad LLM security

Our verdict on Prompt Inspector

Prompt Inspector is an open-source security layer for LLM-powered applications and AI agents. It analyzes untrusted prompts before they reach a language model through sensitive-word matching, semantic vector-based threat detection, optional AI review, and result arbitration. The product is aimed at developers building chatbots, autonomous agents, AI coding tools, and other applications that need prompt-injection defenses. It is available through a cloud API, Python and Node.js SDKs, an MCP server, and self-hosted deployment across web, API, Windows, macOS, and Linux.

The product’s strongest fit is its developer-facing ecosystem. A REST API provides prompt safety verdicts, while the Python and Node.js SDKs support application integration. MCP server integration connects the product with Model Context Protocol workflows, and listed integrations include Cursor, VS Code Copilot, Claude Desktop, and Dify. Custom sensitive-word lists support literal and regex matching, giving teams a way to define application-specific terms alongside semantic detection. The threat payload library adds a dedicated reference point for known threats, with self-iterating enrichment described as part of the feature set.

Prompt Inspector uses a freemium structure with Free, Starter, Pro, and Enterprise plans. The free plan can make it accessible for early evaluation or smaller development projects, while the broader plan structure gives teams room to adopt additional commercial tiers as their needs change. Self-hosting is relevant for teams that want deployment control, and the open-source model may suit developers who prefer to inspect or operate the security layer themselves. Choose Prompt Inspector when prompt-injection detection, MCP support, and flexible deployment are the priority. Choose a broader runtime guardrail platform when verified coverage beyond prompt-injection defense is the deciding requirement.

Prompt Inspector pricing

Plans Free planFreemium A usable free plan; paid tiers unlock the limits above. Prices re-checked Sep 2026.
See plans on promptinspector.io

All 4 Prompt Inspector plans and prices →

Prompt Inspector fact sheet

Free planYes
Paid fromNot verified
Prompt injection defenseYes
PII redactionNot verified
Secrets detectionNot verified
Output guardrailsNot verified
Model-abuse detectionNot verified
Deployment modelNot verified
DeploymentCloud, Self-hosted
PlatformsWeb, Windows, macOS, Linux
Compliance & securitySSO/SAML
SupportDocs, Community
Built forSmall business, Mid-market, Enterprise (editorial estimate)
Integrations5 integrations: Cursor, VS Code Copilot, Claude Desktop, Dify, Model Context Protocol
PricingFree plan (source)
Websitepromptinspector.io
Facts checked21 Sep 2026

Prompt Inspector integrations

Prompt Inspector lists 5 integrations on its own site.

  • Cursor
  • VS Code Copilot
  • Claude Desktop
  • Dify
  • Model Context Protocol

Alternatives to Prompt Inspector

See all Prompt Inspector alternatives →

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Featured on iTechGuides

Featured on iTechGuides — Prompt Inspector 5.3/10

Prompt Inspector is listed in our LLM Security Tools directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

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