You just pasted your client's bank details into ChatGPT.

fearnot catches names, account numbers, and API keys before the send — on your device, in milliseconds. Nothing leaves your browser. Verify it yourself.

Demo: a message to an AI chat containing a person's name, an account number and a PAN is typed. fearnot flags each one and replaces them with placeholders NAME_1, ACC_1 and PAN_1 before sending.

This is normal now. That's the problem.

77%

of enterprise AI users paste company data into chatbots

14×

pastes per day, per person, on average

82%

go through personal accounts no security team can see

Sources: LayerX Enterprise AI telemetry; Menlo Security 2025.

01 detect02 seal03 send clean
  • person
  • address
  • PAN · checksum valid
  • account no.
  • API key · AWS

Please reconcile this for [NAME_1] at [ADDR_1]. PAN [PAN_1], A/C [ACC_1]. Billing runs with key [KEY_1].

assistant

Done. Reconciliation drafted for Rohan Mehta — PAN AXJPM4821K and A/C 50100234887766 matched to the invoice.

⌘C

Redacted going out. Real coming back.

Reversible redaction — the AI never sees the data, you never lose it. The mapping lives in an encrypted vault on your machine.

PANAadhaarcredit cardsIFSCGSTINIBANSSNAWS keysGitHub tokensJWTs.env blocks
namesaddressesclient listscontract languagemedical contextpasted screenshots

Three detection tiers: instant pattern validators, an on-device language model (Gemini Nano — your text never leaves Chrome), and your own custom dictionaries.

Now your AI clicks buttons by itself.

Agentic browsing is here — and prompt injection is officially unpatched. fearnot's Agent Seatbelt is the flight recorder: every click logged, payments tripwired, injections flagged.

Demo: an AI agent's cursor moves toward a Buy now button. The Seatbelt panel logs each action, raises a payment tripwire, and the agent cursor freezes before it can buy.

Don't trust us. Watch the network tab.

A network panel shows zero requests containing your text while a message is typed.

  • Open source

    read the detection engine you're trusting, line by line.

  • Minimal permissions

    it only runs on AI sites — nowhere else in your browser.

  • Local vault

    every redaction mapping is sealed on your device.

Free to be careful. Paid to be thorough.

Free

₹0

  • — Detection on ChatGPT, Claude, Gemini
  • — Warnings
  • — 20 redactions / month
Add to Chrome

Pro

₹499/mo · $6

  • — Unlimited reversible redaction
  • — Screenshot scanning
  • — Custom dictionaries
  • — Minimize modes
  • — Encrypted audit vault
  • — More sites
Go Pro

Team

waitlist

  • — Shared policies
  • — Admin visibility
  • — Zero-data-path compliance
Join waitlist

Say everything.
Leak nothing.

Add to Chrome — free