Instead of Prompt Inspector
Prompt Inspector alternatives
Prompt Inspector focuses on checking prompts before they reach an AI system. Its API detects prompt injections, jailbreaks, and system-prompt leaks, with layers for sensitive-word matching, semantic analysis, optional AI review, and arbitration. It also offers a REST API, Python and Node.js SDKs, an MCP server, and a free plan with 1,000 detections per month. The service supports web, desktop, Linux, API, and self-hosted use; self-hosting is for non-commercial use under AGPL-3.0. Cloud pricing is pay-as-you-grow, but no price is stated, and the published monthly allowance differs between the homepage and API article.
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PromptGuard
Free plan APIExtensionLinux+4Teams needing broad LLM security and deployment options — PromptGuard adds 15 detectors across six layers, reversible PII tokenization, and managed, hybrid, and air-gapped deployment.
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NVIDIA NeMo Guardrails
Free plan Open source APILinuxMac+2Developers building configurable guardrails in Python — NeMo Guardrails adds programmable input, retrieval, dialog, execution, and output rails configured with YAML and Colang.
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Amazon Bedrock Guardrails
Paid WebTeams configuring content and information filters — Bedrock Guardrails offers separately priced text and image filters, denied topics, sensitive-information filters, and prompt-attack checks.
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Openlayer Guardrails
Free plan APISelf-hostedWebTeams needing live controls and traceable decisions — Openlayer adds live input and output enforcement, more than 50 PII and PHI entity types, and decision evidence records.
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CyberSecEval
Free plan Open source APILinuxMac+2Teams benchmarking model cybersecurity behavior — CyberSecEval is a benchmark suite for evaluating model vulnerabilities and defenses, not a runtime prompt inspection service.
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GLACIS
Free plan APISelf-hostedWebAI teams needing signed records of runtime actions — Glacis controls AI actions and creates signed, externally verifiable records, rather than focusing on prompt threat detection.
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LLM Guard
Free plan APILinuxSelf-hostedPython teams integrating open-source scanners — LLM Guard provides customizable input and output scanners, including anonymization, toxicity, secrets, and factual consistency checks.
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Inferwall
Free plan APILinuxMac+1 - 9
Guardrails AI
Free plan APISelf-hostedWeb - 10
Sanctum Runtime
Free plan AndroidAPIiPhone+3 - 11
VotalAI
Free plan APISelf-hostedWeb - 12
GuardionAI
Free trial APILinuxMac+36.4 Visit site - 13
Google Cloud Secret Manager
Free plan Web - 14
Cisco Catalyst Center
Paid APILinuxMac+3 - 15
Check Point AI Guardrails
Paid APISelf-hostedWeb - 16
Vigil Guard
Free trial APIExtensionLinux+1 - 17
Cloudflare Advanced Certificate Manager
Paid APIWeb - 18
HiddenLayer AI Guardrails
Paid Self-hostedWeb - 19
Noma Security
Paid APISelf-hostedWeb - 20
Lasso AI Security Platform
Paid APIExtensionWeb - 21
SecureAI Guard
Paid APISelf-hostedWeb - 22
Straiker Defend AI
Paid APISelf-hostedWeb - 23
WitnessAI
Paid APIWebWindows - 24
ZeroTrusted AI Firewall
Paid Self-hostedWeb - 25
Prompt Security AI Red Teaming
Paid Self-hostedWeb
Alternatives may suit teams that need broader input and output controls, more deployment choices, or a benchmark rather than a runtime service. Some focus on PII handling, policy configuration, or evidence records; others are open-source libraries that require integration into an application. Compare what each product checks, where it runs, how it handles data, and whether it is a service, toolkit, or evaluation suite. Those differences matter alongside price, deployment constraints, and the controls Prompt Inspector already provides.
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