Backed by   Combinator

Use safely without leaking sensitive data.

Employees use ChatGPT, Copilot, and Claude every day. LogosGuard blocks sensitive data before it reaches AI tools.

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Built by researchers and engineers from

Organizations want AI productivity without exposing sensitive data.

AI adoption is already happening

Training helps, but you still need a technical guardrail. IT teams can't block tools employees already use — they'll just find workarounds. Instead, you need visibility and control.

Data leaks are a real risk

Employees sharing PII, PHI, credentials, customer data, or proprietary code with AI tools exposes your company to breaches, compliance violations, and competitive harm.

Existing solutions don't scale

Network blockers are too blunt. Training alone doesn't stick. You need automated, real-time enforcement that adapts to new tools and workflows.

Real-time redaction and blocking

Detect and mask sensitive data before it's sent. Warn users, redact automatically, or block outright based on your policies. Works on paste, on type, and on submit.

Works with any AI tool

LogosGuard sits as a proxy between your team and any LLM, like ChatGPT, Copilot, Claude, Gemini. No per-tool integrations needed.

Full audit and compliance logs

Every prompt, every action, and every policy trigger is logged and searchable.

Three ways to protect your team.

Browser Extension

Blocks sensitive data from being submitted to AI web apps like ChatGPT, Copilot, and Claude — directly in the browser, before anything leaves the device.

  • ✓ Works on all major AI web apps
  • ✓ Real-time interception in the browser
  • ✓ No VPN or proxy required

Desktop App

Monitors and blocks sensitive data sent through native desktop AI tools — covering apps the browser extension can't reach, like local clients and IDE integrations.

  • ✓ Covers native and desktop AI clients
  • ✓ Works across macOS and Windows
  • ✓ Lightweight background process

Private LLM

Deploy a fully private, self-hosted LLM inside your own infrastructure — giving your team the power of frontier models without sending a single token to a third party.

  • ✓ Runs on-prem or in your VPC
  • ✓ No data ever leaves your environment
  • ✓ Fine-tune on your proprietary data
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Your rules. Your data.
Your control.

Try LogosGuard Pro free for 7 days — or book a demo to roll it out for your team.

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