PromptGuard review
Broad AI security testing with flexible deployment and a low-cost paid entry tier.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
PromptGuard is an AI security platform for teams testing and protecting applications that use large language models. It sits between applications and LLM providers to detect prompt injection, jailbreak attempts, PII exposure, data exfiltration, unsafe content, secrets, and other threats. Its red-team module covers 20+ attack vectors, custom attacks, fuzzed variants, tool-call validation, and automated assessments. This makes it a fit for development, security, and AI engineering teams that need both ongoing protection and repeatable testing across web, API, desktop, browser extension, or self-hosted environments.
The published plans show a freemium structure with monthly pricing. Free includes 20,000 scans per month, prompt injection and PII detection, and one API key. Pro costs $99 per month and adds 100,000 scans, the full detector set, custom policies, email alerts, and five API keys. Standard starts at $19 per seat per month and includes 15,000 pooled scans per seat, a browser extension, macOS and Windows agents, on-device secret blocking, and PII redaction. Scale includes 500,000 monthly requests, unlimited API keys, unlimited projects, and advanced analytics. Enterprise adds fully air-gapped deployment, SCIM, IP allowlisting, custom retention, a dedicated CSM, custom SLAs, and an analytics dashboard.
Provider coverage is a notable strength: PromptGuard lists OpenAI, Anthropic, Google Gemini, Azure, Amazon Bedrock, Mistral, Cohere, DeepSeek, Groq, Hugging Face, Ollama, and vLLM integrations. CI/CD integration supports regression testing, while API scanning and redaction extend protection beyond red-team assessments. Teams should pick PromptGuard when they want broad attack coverage, multiple deployment options, and a free or $19-per-seat starting point. It is less suitable for buyers seeking a simple single-purpose scanner or a product whose advanced capabilities are available entirely on the entry plan.
PromptGuard pros and cons
- Where it wins
- 20+ attack vectors plus custom and fuzzed adversarial variants
- CI/CD regression testing, security grades, and vulnerability reports
- Web, desktop, browser extension, API, and self-hosted deployment
- Where it doesn't
- Free plan limits usage to 20,000 scans per month and one API key
- Advanced capabilities are concentrated in paid and higher-tier plans
- Premium offers no listed feature highlights
PromptGuard fact sheet, pricing and score →
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