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Tech riderRev. 4 Oct 2026

Prompt Inspector

Ch 017.4of 28 LLM Security Tools
  1. 1Runs onAPI, Linux, Mac, self-hosted, Web, Windows
  2. 2CostsFree plan
  3. 3Prompt injection defenseYes
3 lines stated Written from the maker's own pages: promptinspector.io
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Overview

Prompt Inspector is ranked #1 of 28 in LLM security tools on Specifiction. 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
Yespromptinspector.io
Prompt injection defense
Yespromptinspector.io

Facts

Purpose
Prompt Inspector provides real-time prompt injection detection, sensitive word filtering, and AI safety guardrails through an API call.promptinspector.io · 4 Oct 2026
Threat detection
Its detection engine checks for prompt injections, jailbreaks, and system prompt leaks.promptinspector.io · 4 Oct 2026
Detection layers
The engine uses hash caching, sensitive word matching, semantic vector analysis, optional AI review, and arbitration.promptinspector.io · 4 Oct 2026
Integrations
The maker lists a REST API, Python SDK, Node.js SDK, MCP server, and agent skills for OpenClaw and Claude Code.promptinspector.io · 4 Oct 2026
MCP clients
The maker identifies Cursor, VS Code Copilot, and Claude Desktop as tools that can connect through its MCP server.promptinspector.io · 4 Oct 2026
Tenant isolation
The maker says each app has its own API key, sensitive word configuration, rate limits, and detection logs.promptinspector.io · 4 Oct 2026
Self-hosting
The maker offers a self-hosted option for non-commercial use under the AGPL-3.0 license.promptinspector.io · 4 Oct 2026
Enterprise
The enterprise offering includes private or on-premise deployment, custom integrations, managed payload library updates, and dedicated SLA support.promptinspector.io · 4 Oct 2026
Free allowance
The homepage states the free plan includes 1,000 detections per month.promptinspector.io · 4 Oct 2026
Pricing detail
The maker describes cloud pricing as pay-as-you-grow but does not state a price on the opened homepage.promptinspector.io · 4 Oct 2026
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.promptinspector.io · 4 Oct 2026
Support
The homepage lists community support for self-hosted users and dedicated SLA support for enterprise customers.promptinspector.io · 4 Oct 2026

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All accessCh 02 PromptGuard Free planAPIBrowser from $19/mo7.3 All accessCh 03 GuardionAI Free trialAPILinux 7.2 All accessCh 04 Amazon Bedrock Guardrails Web from $0.07/mo7.0 All accessCh 05 Openlayer Guardrails Free planAPIself-hosted Free to start6.9 All accessCh 06 WitnessAI APIWeb 6.9 All accessCh 07 GLACIS Free planAPIself-hosted Free to start6.8

Where it ranks on Specifiction

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Sources