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Your secrets shouldn't end up in someone else's AI.

People paste passwords, card numbers, client records, even a kid's home address, straight into ChatGPT. AI Prompt Guard catches it the moment it's typed, and warns or blocks before it's sent.

Works on ChatGPT, Claude, Gemini & more Your data stays on your machine Set up in under a minute
▌ chat.openai.com ● Prompt Guard on
Watching…
Type a prompt and Prompt Guard checks it in real time.
Send ⏎
The problem, in numbers 1 in 10 prompts to public AI tools contains sensitive data* Most teams have no control that actually catches it 0 servers see your prompts with Prompt Guard
What it catches

It knows private data when it sees it.

Built-in detectors for the things you don't want in a chat box. Tunable, with your own words and patterns on top.

KEY

Secrets & keys

API keys, OAuth & JWT tokens, AWS/GCP/Azure secrets, SSH & PGP keys, passwords, DB connection strings.

FIN

Financial

Credit cards & CVV, bank, routing, IBAN & SWIFT, crypto wallet addresses, tax IDs.

ID

Government IDs

Social Security, passport, driver's license, national IDs, date of birth.

PII

Personal info

Home address, phone, email, GPS coordinates, health & insurance details.

BIZ

Work & confidential

"Internal only," NDA & legal terms, M&A and roadmap chatter, internal URLs.

KID

Kid safety

Age, school name, "home alone," meet-ups, "don't tell my parents."

30+ built-in detectors and ready-made keyword packs. Everything is off by default, so you switch on exactly what matters to you, and add your own words or patterns.

How it works

Quiet until it matters.

1

Install & choose

Add it to Chrome or Edge, pick what counts as private and whether to warn or block.

2

It watches as you type

On supported AI sites, it checks each prompt the instant before it's sent.

3

Warn, block, or log

A risky prompt gets held back with a clear reason, and recorded in your private history.

4

Get told when it counts

Optional email alert to a parent or guardian when something private slips through.

🔒 Private by design

  • Your prompts and history stay on your device. Full stop.
  • No account, no tracking, no prompt ever sent to us.
  • Sensitive values are stored masked, not in the clear.
  • Alerts go only where you choose to send them.
MADE BY READYSTRIKE
For security teams

Prompt Guard shows one person what leaks into AI. ReadyStrike proves whether your whole company's controls would catch it, before an attacker finds out they don't.

ReadyStrike · Continuous Cyber Readiness

Do your AI & security controls actually fire?

We send faithful, safe test events at your live detection and data-loss controls and tell you what caught them, and what didn't. No theater, no false gaps.

Validate DLP / CASB / AI-gateway against real data-egress
Map coverage to MITRE ATT&CK with evidence
Catch silent failures before attackers do

For Fortune 1000 & mid-market security teams. We'll reach out within a day.

Free forever for the basics

Stop the next overshare before it happens.

Pro options like custom rules, multiple guardians, and team reports unlock with a license key.