PromptGuard
No phone app
in AI Security Testing Tools
- Recognised40% of the score20
- Phone app26% of the score0
- Documented20% of the score90
- Free plan14% of the score100
- Free plan
- Yes
- Paid plans from
- $19/mo
- Runs on
- api, Browser extension, Linux, Mac, self-hosted, Web, Windows
Summary
PromptGuard is a security layer between an application and its LLM provider that inspects requests before they reach the model. It describes 15 detectors across six layers for risks including prompt injection, jailbreaks, personal information exposure, data exfiltration, toxicity, fraud, secrets, malware, and tool injection. The product says it can detect and redact 43 PII types using reversible tokenization. Its SDK can automatically instrument supported LLM calls with one initialization call while leaving existing provider code unchanged. Listed providers include OpenAI, Anthropic, Gemini, Azure, Bedrock, Mistral, Cohere, DeepSeek, Groq, HuggingFace, Ollama, and vLLM. Deployment options are managed cloud, hybrid self-hosting, and air-gapped installations. In zero-retention mode, prompt and response content is not stored; default security events contain a shortened preview and content hash. PromptGuard says customer prompts, completions, and documents are not used to train, fine-tune, or evaluate models. The permanent Free tier includes 20,000 scans a month, one API key, one project, and 24-hour log retention. Paid plans include a 14-day money-back guarantee, not a trial.
Who it is for
It suits application teams that want to inspect LLM requests before they reach a provider, including for prompt injection, PII, or data leakage risks. Its self-hosted and air-gapped deployment choices may suit teams that need deployment beyond managed cloud.
What is good
- Describes 15 detectors across six layers.
- Detects and redacts 43 PII types.
- SDK can instrument supported calls with one initialization.
- Offers managed cloud, hybrid self-hosting, and air-gapped deployment.
- Free tier includes 20,000 monthly scans.
What to know first
- No free trial is listed.
- Hosted service has no EU region currently.
- SOC 2 Type II certification is not yet in place.
- Five OWASP LLM Top 10 risks are only partially covered.
Verdict
PromptGuard provides request inspection, data controls, and several deployment modes for LLM applications. Note that its free tier is permanent rather than a trial, and the listed OWASP LLM Top 10 coverage includes partial areas and gaps.
PromptGuard plans and pricing
All plansCompared on AI security testing tools
- Free plan
- Yespromptguard.co
Facts
- Product
- PromptGuard is a security layer between an application and its LLM provider that inspects requests before they reach the model.promptguard.co · 30 Sept 2026
- Threat detection
- The product describes 15 detectors across six layers for threats including prompt injection, jailbreaks, PII, data exfiltration, toxicity, fraud, secrets, malware, and tool injection.promptguard.co · 30 Sept 2026
- PII controls
- PromptGuard says it detects and redacts 43 PII types, with reversible tokenization.promptguard.co · 30 Sept 2026
- Deployment
- The product offers managed cloud, hybrid self-hosting, and air-gapped deployment; air-gapped licences validate offline with a signed key.promptguard.co · 30 Sept 2026
- Integrations
- The site lists integrations/providers including OpenAI, Anthropic, Gemini, Azure, Bedrock, Mistral, Cohere, DeepSeek, Groq, HuggingFace, Ollama, and vLLM.promptguard.co · 30 Sept 2026
- SDK behavior
- Its SDK can auto-instrument supported LLM calls with one initialization call while leaving existing provider code unchanged.promptguard.co · 30 Sept 2026
- Security data handling
- Zero-retention mode does not store prompt or response content, while default security events record a truncated 500-character preview and content hash.promptguard.co · 30 Sept 2026
- Training
- PromptGuard says customer prompts, completions, and documents are never used to train, fine-tune, or evaluate models.promptguard.co · 30 Sept 2026
- Certifications
- The trust page says SOC 2 Type II is not yet certified, ISO 27001 is planned, and GDPR and CCPA are supported.promptguard.co · 30 Sept 2026
- Residency
- The hosted service runs on Google Cloud Run in us-central1, and the company says it does not currently offer a hosted EU region.promptguard.co · 30 Sept 2026
- Support
- Pricing lists community support for Free, email support with a 48-hour response time for Pro, priority support with 24 hours for Scale, and dedicated support with four hours for Enterprise.promptguard.co · 30 Sept 2026
- Trial
- The pricing FAQ says Free is a permanent tier rather than a time-limited trial; paid plans include a 14-day money-back guarantee.promptguard.co · 30 Sept 2026
- Notable limits
- The product says five OWASP LLM Top 10 risks are covered in full and five are partial, with stated gaps including provenance verification and vector-store isolation.promptguard.co · 30 Sept 2026
- Company
- PromptGuard is the trading name of PG Tech Ltd, registered in England and Wales, with a registered office in London.promptguard.co · 30 Sept 2026
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Sources
- promptguard.co/about· checked 30 Sept 2026
- promptguard.co/features· checked 30 Sept 2026
- promptguard.co· checked 30 Sept 2026
- promptguard.co/security· checked 30 Sept 2026
- promptguard.co/pricing· checked 30 Sept 2026