macOS
Universal · Apple silicon and Intel
Download ↓ Free · Open source · Signed builds
Your whole stack,
in one window.
Ask why signups dropped and get an answer that read Google Ads, GA4 and Stripe together. Approve the fix from the same card. Your model keys never leave your keychain.
macOS, Windows and Linux · Free · No credit card
Pick your platform
Every build is on the releases page with SHA-256 checksums. Or self-host it: same code, nothing touches our servers.
Windows
Windows 10 and later
Download ↓
Linux
Runs on any distribution
Download ↓Debian / Ubuntu
apt-based distributions
Download ↓What you get
Reads across. Acts with approval.
Remembers.
Reads across tools
Twelve connectors. Ads, analytics, revenue and session replays, read together for one question.
Acts, with your approval
It proposes the change, shows what it touches, and applies it only when you press Apply.
Remembers
Targets, decisions and what it learned, on a timeline you can correct.
Why it is called Duct
Named after the aqueduct.
Duct is Latin, ductus, a leading. It is the word inside aquaeductus: water, led. Rome’s aqueducts never made a drop of water. The springs already had it. Rome built the channel that carried it, on gravity alone, to where people lived.
Your stack is the same. Ads, analytics, search, revenue: the springs are fine. What is missing is the channel between them and the decision. That is the job, and the name.
It is also why the app greets you with a Roman threshold mosaic, SALVE, instead of a robot, and why the water runs full once everything is caught up. The whole story →
Two ways to run it
Download it, or build it.
The app is the fast way in: we run the backend, you run nothing. The code is all here if you would rather run every part of it yourself. Same repository, same agents, same connectors.
The desktop app
Sign in and start
Download, sign in with Google, connect your stack. Your projects and briefs live in Duct’s cloud, so they are there on your laptop and your desktop both, and adding a teammate to a project takes one invite. Nothing to host, nothing to keep running.
- Free with your own keys. No account fee, no card.
- Your model keys stay in your OS keychain and are sent with a request when a job runs. We never store them.
- Invite teammates to a project and share the same work.
- Updates itself on macOS, Windows and Linux.
Run it yourself
Nothing touches our servers
Duct is MIT licensed, and that includes the backend the app talks to. Host it on your own server, or build the desktop shell with the backend bundled inside it, and every part of the loop runs where you decide. No account with us, no data with us.
- Your database, your storage, your retention rules.
- The same connectors and agents. There is no held-back edition.
- No sign-up required.
- You operate it. Updates, backups and uptime are yours.
Where your things actually live
Worth being precise about, because “private” is a word everyone uses and few explain.
| Using the desktop app | On your device | In Duct’s cloud |
|---|---|---|
| Model API keys (Anthropic, OpenAI, Gemini, OpenRouter) | Yes — your OS keychain | Never stored. Sent with a request so the job can run |
| Connector authorisations (Google Ads, GA4, Mixpanel…) | — | Encrypted at rest, decrypted only to make a call you asked for |
| Projects, briefs, memories, activity log | — | Yes — which is what makes them there on your next device |
| Files you upload | — | Yes |
| Your account | — | Google sign-in: name, email, avatar |
Run it yourself and every row moves to your side of the table. The full detail is in the privacy policy.
macOS — universal, runs on Apple silicon and Intel. Requires macOS 12 or later. Signed and notarized by Apple, so it opens without a warning.
Windows — Windows 10 and later. The installer is not yet code-signed, so SmartScreen will say “Windows protected your PC” on first run: click More info → Run anyway. We are fixing this.
Linux — the AppImage runs anywhere (chmod +x it first); the .deb is for Debian and Ubuntu. Provider keys need a keyring daemon running — GNOME Keyring, KWallet or KeePassXC.
Your model keys stay yours. Duct is bring-your-own-key: paste an Anthropic, OpenAI or Gemini key and the desktop app keeps it in your OS keychain rather than a browser tab. Or sign in with the ChatGPT plan you already have. You are billed by the provider, not by us.