Windows
With early-access teams today.
Tell us about your team and you will hear back with a date, and with what protection looks like for the tools you actually use.
AVAILABILITY
Closehold is not public yet.
There is no public release today. The desktop app is with early-access teams, and this is the page it appears on when it opens to everyone.
macOS
macOS build, coming soon.
The macOS build is behind Windows and is not available to anyone yet, early access included. Leave your email and we will tell you the day it ships.
No public installer · no beta link · early access is the only way in today
BROWSER EXTENSION
Pairs with the desktop app automatically.
24 AI sites in the browser, ChatGPT, Claude, Gemini and Microsoft Copilot among them. It captures the prompt and hands it to the local engine. Once the desktop app is installed the extension pairs with it by itself, nothing to paste.
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Chrome Get it from the Chrome Web Store -
Edge Coming soon -
Firefox Get it from Firefox Add-ons -
Safari Coming soon
The Chrome and Firefox listings are live; Edge and Safari follow. The extension has no detection logic of its own, so it protects nothing until the desktop app is installed: that is where the engine it hands prompts to lives.
ONCE YOU ARE IN
Three steps to a protected team.
1 · Run it once
The app starts the local engine and sits quietly in the tray.
- Runs the protection brain on your machine
- Auto-updates, signature-verified
- Hosts the engine the extension pairs with
2 · Add the browser extension
It pairs with the desktop app by itself. All 24 browser surfaces are protected from the first prompt.
- Prompts and files are protected before they leave
- Replies come back with the real values restored
- Chrome, Edge & Firefox
3 · Connect your device
Press Connect in the app and approve the short code in the console. A fleet enrolls with one token.
- Your purchase email is the admin account
- Invite teammates within your seat count
- One enrollment token deploys a whole fleet
WHY IT IS SHUT
A release we cannot stand behind is not a release.
Going public is a promise about provenance, licensing and support all at once, and we make it once the whole path has been reviewed end to end. What the engine does with your data is already settled, and the trust center documents it today: local-first, and the sensitive value itself is never stored.
Read the trust center →
Want it sooner?
Early-access teams get it first. Book a 20-minute walkthrough on your own data, or see what it will cost.
No raw data leaves your machine. Ever.