Prompt Inspector

7.3easy start · #1 of 28
in LLM Security Tools

Free to practise onyes
Free trialnot on record
Well documentedyes
Runs where you workyes

Runs on api, Linux, Mac, self-hosted, Web, Windows.

Prompt Inspector is ranked #1 of 28 in LLM security tools on The Geeks Club. It runs on API, Linux, macOS, Self-hosted, Web, Windows. There is a free plan.

Prompt Inspector plans and pricing

All plans

Free Free 1,000 detections / month 1,000 detections / month · REST API · SDK · MCP promptinspector.io · 4 Oct 2026

Starter Not published 100,000 requests/month · 50 req/s · < 50 ms P95 promptinspector.io · 4 Oct 2026

Enterprise Not published Unlimited requests · Custom rate limit · < 20 ms P95 + SLA promptinspector.io · 4 Oct 2026

Pro Not published 1,000,000 requests/month · 200 req/s · < 30 ms P95 promptinspector.io · 4 Oct 2026

Compared on LLM security tools

Free plan: Yes
Prompt injection defense: Yes

Best Prompt Inspector alternatives

See all 20

PromptGuard 0 of 4 in the starter kit Lesson 27.1 Amazon Bedrock Guardrails 0 of 4 in the starter kit Lesson 37.0 GuardionAI 0 of 4 in the starter kit Lesson 47.0 Openlayer Guardrails 0 of 4 in the starter kit Lesson 57.0 GLACIS 0 of 4 in the starter kit Lesson 66.9 WitnessAI 0 of 4 in the starter kit Lesson 76.6

The record

Purpose: Prompt Inspector provides real-time prompt injection detection, sensitive word filtering, and AI safety guardrails through an API call.
Threat detection: Its detection engine checks for prompt injections, jailbreaks, and system prompt leaks.
Detection layers: The engine uses hash caching, sensitive word matching, semantic vector analysis, optional AI review, and arbitration.
Integrations: The maker lists a REST API, Python SDK, Node.js SDK, MCP server, and agent skills for OpenClaw and Claude Code.
MCP clients: The maker identifies Cursor, VS Code Copilot, and Claude Desktop as tools that can connect through its MCP server.
Tenant isolation: The maker says each app has its own API key, sensitive word configuration, rate limits, and detection logs.
Self-hosting: The maker offers a self-hosted option for non-commercial use under the AGPL-3.0 license.
Enterprise: The enterprise offering includes private or on-premise deployment, custom integrations, managed payload library updates, and dedicated SLA support.
Free allowance: The homepage states the free plan includes 1,000 detections per month.
Pricing detail: The maker describes cloud pricing as pay-as-you-grow but does not state a price on the opened homepage.
API limits: The maker's API article lists 10,000 monthly requests and 10 requests per second for Free, while the homepage lists 1,000 monthly detections.
Support: The homepage lists community support for self-hosted users and dedicated SLA support for enterprise customers.
Price from: Free

Where it ranks on The Geeks Club

Best LLM Security Tools in 2026#1 of 28

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Sources

promptinspector.io· checked 4 Oct 2026
promptinspector.io/blog/prompt-security-api· checked 4 Oct 2026