BEFORE YOU SEND
Small Chrome extensions that help you check for email addresses, phone numbers, API keys and registered terms before sending text to AI or by email. Checks run in your browser.
A working demo — try it ↘
Nothing is sent from this screen. Review the details and decide what to do next.
The real extension works from the rules you configure.
Safe Privacy Gate shows a confirmation just before you send.
Review the text yourself before sending.
TOOLS BY MOMENT
Choose a tool for the moment you want to check: pasting into AI, attaching a file, sending a late-night email or opening a link.
When it finds things like email addresses or phone numbers, it shows a confirmation just before sending. It does not rewrite your text.
Safe Privacy GateIt replaces things like email addresses and API keys inside the input field. An optional confirmation stops a send when masking occurs.
Safe Privacy MaskWhen you attach a file, it shows things like a photo's location and a document's author details. It does not stop the upload.
Safe Attachment CheckChoose whether to return to your draft, schedule the email or send it now.
Safe Night CheckJust before it opens, it shows the link text and the actual URL side by side. It does not declare anything dangerous.
Safe Mail Link CheckSelect a date on the page and it shows the ages at that time, the weekday, the Japanese era year, and how long ago it was.
Find My AgeCollect passages with the right-click menu, reorder and tidy them up, then copy the lot in one go.
Copy & PrepPress the icon and it shows what the page states about its operator, with the evidence.
Site Operator CheckCheck the notice without following its email links, then find out what to do for the information affected.
Check a breach notice (Japanese)Things you can check without installing a tool or paying extra. See Guides →
THE TOOL ROOM
Select a tool to see how it works and how it handles data. Choose based on what you want to check.
Notice it the moment you try to send.
When it finds an email address, phone number or other match, it shows a confirmation without changing your text. You decide whether to send.
Replace personal details in the input field before sharing them with AI.
Masks email addresses, phone numbers, API keys and names you register inside the input field. With confirmation on, a send that masks text pauses for review.
![An AI chat composer where a contact name, an email address and a phone number have been replaced with [Name], [Email] and [Phone]. The Safe Privacy Mask popup floats at the top right, reading “Protecting all fields”.](/assets/screenshots/lp/mask-en.webp)
See hidden information when you attach a file.
Reads image GPS data, the author of a PDF or Office file, comments, tracked changes and hidden sheets — and shows them without deleting anything.
Decide whether that late-night email can wait.
During the night hours you set, sending in Gmail brings up three choices: back to draft, schedule it, or send now. It is not a tool that forbids sending.
See the real destination, not the text shown.
Just before a link in your mail opens, it shows the link text and the actual URL side by side. It does not declare anything dangerous; it gives you more to go on.
How old was I on that day?
Select a date on any web page and it shows how old you and your family were then, the weekday, the Japanese era year, and how long ago it was. Future dates work too.
Collect text from different pages and copy it all at once.
Collect text with the right-click menu, then edit and arrange it. Tidy unwanted line breaks and copy everything as plain text or Markdown.
See who runs this page before you type.
Press the toolbar icon and it shows what the page states about its own operator — with an excerpt of where each line was found. It makes no judgement about whether the site is safe. Primarily designed for Japanese websites.
AI × EXTENSION
A Chrome extension can add a small feature without changing the web systems you already run. And AI now makes software this small easier to build than it used to be.
Keep the task, screen and data requirements small so you can ask AI to implement one feature at a time.
Review the code's permissions, network requests and data storage, then test it in a browser before using it.
The usual browser, the usual screen. Start alone, use it as a team — and in a company, admins decide who gets it.
CONCEPT
In software, “legacy” has come to mean something outdated. Legacy Tools uses the word in its older sense — something handed down.
Not tools you keep switching between, but tools you can still rely on ten years from now.
Not one large tool that does everything, but small tools that do one job properly — built one at a time.
We build tools you can use on your own device, without handing your data to the developer.
NOTES
Read about store rejections, design decisions and problems found after release. These notes explain how the tools are made, including what went wrong.
VERIFY, NOT TRUST
Instead of calling it safe, each product publishes its permissions, its network activity and where it stores things. Being able to check that yourself explains more than any wording could.
You can check the traffic yourself: content scripts running in the page show up in the page's DevTools, and the extension's service worker has its own DevTools, opened from chrome://extensions.
What each tool stores, and where, differs from tool to tool. This table describes the extensions only, not the communication of the websites or AI services you use them on. For analytics on this website itself, seethe site privacy policy.
GET STARTED
No account sign-up. Add it to Chrome and start using it right away. Remove it any time if it does not suit you. They are all free.
No sign-up · Free · Remove any time
At the end of the day, at a desk at night.
No rush, one at a time. Not perfect, but honest.
Found3string(s) in this field that look like personal or confidential information.
