1 · Desktop app
The signed installer bundles the local engine and keeps itself up to date.
- Runs the protection brain on your machine
- Auto-updates (signature-verified)
- Hosts the engine the extension pairs with
DOWNLOAD
Install Closehold in two minutes.
The desktop app runs the protection engine locally on your machine; the browser extension pairs with it automatically. Nothing sensitive ever leaves the boundary you control — and every download is signed and checksum-verifiable.
Windows 10/11 · signed installer · macOS coming soon
GET STARTED
Three steps to a protected team.
2 · Browser extension
For ChatGPT, Claude, and Gemini in the browser — it auto-pairs, no sign-in.
- Captures the prompt, protects it locally
- No detection logic in the browser
- Chrome, Edge & Firefox
3 · Enroll your team
Sign in to the console to add seats and enroll devices.
- Your purchase email is the admin account
- Invite teammates within your seat count
- One enrollment token deploys a whole fleet
VERIFY BEFORE YOU RUN
Signed, and checksum-verifiable.
The Windows installer is Authenticode-signed, and we publish SHA-256 checksums for every release. Verify your download matches before installing — trust the math, not the marketing.
Read the trust center →
Not sure yet?
See it protect your own data first — book a 20-minute walkthrough, or check the pricing.
No raw data leaves your machine. Ever.