AI Guard
Stop sensitive data leaking into ChatGPT, Claude and Gemini
AI Guard inspects every prompt and response on employee devices, finds source code, secrets and personal data, and allows, redacts or blocks it by policy. Your teams keep using AI. Your data stays yours.
The problem
Employees already paste company data into AI tools
Engineers paste code to debug it. Sales teams paste customer emails to summarise them. Finance pastes spreadsheets. Each of those prompts can carry proprietary source code, API keys, customer records or regulated data to a service your security team does not control.
Blocking AI outright pushes people to personal accounts and unmanaged devices. Traditional data loss prevention was built for email, files and network traffic, not for text typed into a chat window. AI Guard closes that gap at the point where the prompt is written.
What AI Guard does
Active safeguards for every AI conversation
Prompt inspection
Every prompt is checked before it leaves the device, including text copied from code editors and documents.
Response inspection
Responses are checked too, so risky instructions, links or code coming back from the model can be flagged.
Source-code protection
Detects proprietary source code and matches it against your own repositories before it reaches a model.
Secret and API-key detection
Finds credentials, tokens and keys in prompts and redacts them automatically.
PII and sensitive data detection
Identifies personal data and sensitive business information across 30+ security categories.
Organisation policies
Set rules per team: allow, redact, block or log, for each AI service and each data type.
How it works
An inspection pipeline between your people and the model
Capture
Prompts and code-copy events are captured on the employee device.
Intercept
The AI Guard agent intercepts the request in flight and sanitises data.
Evaluate
The policy engine applies matchers for PII, API keys and proprietary source.
Act
The request is allowed, redacted, blocked or logged, with the reason recorded.
Coverage
One control for every AI service your teams use
AI Guard monitors, controls and enforces secure AI usage across ChatGPT, Claude, Gemini, AI search engines and local developer tools, so policy follows the data rather than the app.
- Multi-AI service support
- AI usage monitoring and dashboards
- Request and response logging
- Allow and block enforcement
- Redaction before data leaves the device
- Per-device pricing, independent of package plans
Who it is for
Built for security teams that want to say yes to AI
CISOs and security leaders
See which AI tools are in use, what data flows into them and where policy is being enforced.
Engineering organisations
Let developers use AI coding tools without sending source code or secrets to third parties.
Compliance and privacy
Keep personal and regulated data out of external models, with logs to prove it.
FAQ
AI Guard: common questions
What is AI Guard?
AI Guard is a PexLens product that inspects prompts and responses on employee devices, detects sensitive data such as source code, secrets and personal information, and allows, redacts or blocks it according to your organisation’s policy.
Which AI tools does AI Guard support?
AI Guard works across ChatGPT, Claude, Gemini, AI search engines and local developer tools.
What sensitive data can AI Guard detect?
Source code, secrets and API keys, personal information (PII) and other sensitive content defined in your organization policies, across more than 30 security categories.
What actions can AI Guard take?
AI Guard can allow, redact, block or log a prompt or response based on your policy. Every decision is recorded, so security teams can review AI usage and tune policies.
Does AI Guard inspect AI responses too?
Yes. AI Guard inspects both prompts and responses, so you can monitor and control what flows to and from AI services.
Does AI Guard block AI tools completely?
No. AI Guard is designed to let teams keep using AI. It removes or blocks only the sensitive data your policy covers and logs every decision.
How is AI Guard different from traditional DLP?
Traditional DLP watches email, files and network traffic. AI Guard works at the prompt itself, on the device, before the text reaches an AI service.
How is AI Guard priced?
AI Guard is priced at $5 per device, per month, covering all monitored prompts and responses on that device.
Is AI Guard included with package security?
No. AI Guard is a separate per-device subscription, so you can buy it on its own or alongside any package plan.
How does the AI Browser relate to AI Guard?
AI Guard protects prompts and responses on existing browsers and devices. The AI Browser adds session, clipboard and browser-policy controls. Both use the same PexLens policy engine.
Can PexLens stop developers pasting code or secrets into AI tools?
Yes, with AI Guard. It detects source code, secrets and API keys in prompts on the device and redacts or blocks them according to your policy.
How does AI Guard handle sensitive data in prompts?
AI Guard inspects prompts on the device and can redact or block sensitive data before it leaves for an AI service. Decisions are logged according to your policy so you can audit them.
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Use AI without leaking what matters
See AI Guard inspect real prompts in a 30-minute demo.