Catch secrets before they reach the chat.
PromptKit checks what you are about to send to ChatGPT, Claude and Gemini, on your own device, and stops API keys, passwords and personal data before they leave your browser.
Free beta for Chrome, Edge and Brave. No account. Nothing you type is sent to us.
This message contains 2 sensitive items
Not sent yet. Choose what to do. Here is what PromptKit found (shown partly hidden):
- criticalOpenAI API key: sk••••••••B2
- criticalCard number: 41••••••••11
- mediumEmail address: ja••••••••om
Checked on this device. Nothing was sent to PromptKit.
How it works
- 1
You write
Use ChatGPT, Claude or Gemini as you always do.
- 2
PromptKit checks, on your device
Before the message is sent, it looks for keys, passwords, cards and personal data. No server is involved.
- 3
You decide
Hide the sensitive parts and send, edit the message, or let lower-risk items through.
Write better prompts, as you type
The Prompt Coach scores every message out of 100, on your device, and tells you in one line what is missing: a role, who it's for, limits, a format.
One click inserts a ready-made structure. Save your own templates and insert them whenever you need them.
Has: a clear task
Missing:
- a role: who should it act as?
- who it's for, and why
- limits: length, tone, what to avoid
- length or format
What it catches
You choose Block, Warn or Off for each category, and you can add your own keywords and rules.
Nothing leaves your browser
PromptKit has no server and makes no network request of its own.
Your messages, your files and the values it finds stay in memory on your device. They are never stored or sent.
It asks for only two things: storage, to keep your settings, and access to chatgpt.com, claude.ai and gemini.google.com.
Pricing
Start free. Pay once or yearly only if you need higher limits. Prices are in euros. Local VAT, where it applies, is added at checkout by Paddle.
Free
€0
- Detection and blocking on ChatGPT, Claude and Gemini
- Hide and send, Ignore once, exceptions
- Prompt Coach and score
- Your own keywords
- Up to 3 custom rules and 5 templates
- Statistics, pause and the waiting games
Pro
Everything in Free, and up to 50 custom rules and 100 templates.
Pro, 1 year
€19 for 12 months
The license is valid for 12 months and does not renew by itself.
Pro, for life
€29 one time
The key has no end date.
Licenses are not on sale yet. Request the beta to try PromptKit for free in the meantime.
What you receive
After your purchase you receive an order number from Paddle. Enter it with your e-mail address on the Get my key page to receive your license key, then paste it into PromptKit's settings. The key is checked on your device and raises the limits right away. No account is needed.
Good to know
- Today, Pro raises the limits listed above. We do not promise any other future feature.
- You can try everything else for free before you buy.
- Within 30 days of purchase you can get a full refund, with no reason needed. See the refund policy.
- For companies and teams, contact us.
Questions
Do you see my prompts?
No. Your messages are checked inside your browser and never sent to us. The extension makes no network request.
Which browsers and sites?
Chrome, Edge and Brave, on chatgpt.com, claude.ai and gemini.google.com.
What if it flags something that is not secret?
Choose Ignore once or add an exception, or lower the action for that category in the settings.
Is it free?
Yes, with limits. A Pro license raises them. See the pricing above.
Can my company use it?
Yes. Contact us about deploying it with a managed policy.
What are its limits?
Detection works on patterns, so it cannot recognize every sensitive piece of information and should not be your only safeguard. It works on ChatGPT, Claude and Gemini only, in Chrome, Edge and Brave. Those sites change their pages without notice: a daily test tells us when something breaks, and we fix it.
Try the beta
Free for now, with limits. Chrome, Edge and Brave.
Request the beta
You receive a zip file by e-mail.
Install it
Unzip it, open chrome://extensions (or edge://extensions), turn on Developer mode, click Load unpacked and choose the folder.
Use it as usual
A small chip near the message box shows your prompt score. If a message holds something sensitive, a panel opens and nothing is sent.
Please enter a valid e-mail address.
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We use your address only to send you the beta and the news that matter for it. No newsletter, no third party. See the privacy policy.