macOS
Picks the right build for your Mac’s chip, Apple silicon or Intel. Signed and notarized by Apple.
Desktop appAndroid app
Download OpenTandem for MacDownload OpenTandem for WindowsDownload the OpenTandem Android app
Follow task progress, reply to your agents and get notified of new replies on your phone. To connect a computer, scan its QR code in the app.
Download for WindowsUse the web version
If Windows shows “Windows protected your PC” on first launch, click More info, then Run anyway. See how
Use the web version
On iPhone, use the web version for now
Choose your version
Windows
For Windows 10 and later, 64-bit. The desktop app includes the Runner, so there is nothing else to install.
Stopped by Windows on first launch? See how to allow it
Android phones
Install the app and sign in with the same email you use on your computer. To connect a computer, scan its QR code in the app.
You can use OpenTandem in your mobile browser now.
iPhone
The iPhone app is on its way. For now, open the web version in Safari and add it to your Home Screen to use it full screen, like an app.
Desktop app
From sign-in to results, all in the Mac app
Step 1 · Sign in
Sign in with an email code, in your browser.
Open the app and choose Sign in. The sign-in page opens in your default browser, where you enter your email and the 6-digit code. Confirm the account, and you return to the app.
- Email and a 6-digit code
- Confirm the account in the browser
- Return to the app and keep going
Step 2 · Connect this Mac
Connect this Mac to your account in one click.
After you sign in, OpenTandem asks whether to connect this computer to your account. Choose Connect, and this Mac appears in your Machines list, ready to take tasks from the web or your phone. Only workspace admins can connect a computer.
- One confirmation, no command to run
- Status shown in the sidebar and the Machines list
- Not now? Connect later in Settings → Computers
Step 3 · Run a task
Pick this Mac and send the task.
Write the task, choose a project folder and select this Mac as the machine. The agent runs on your computer, inside your own project, and you follow its progress in the conversation.
- Choose the project folder and machine in the composer
- The task runs on this Mac
- Follow progress in the conversation
Step 4 · Read the result
Open the files your agents make, right on your Mac.
From any file preview you can show the file in Finder or open it with the app you already use. Files created on another computer open here in one click, as a copy in your default app.
- Show in Finder from the file preview
- Open with your default app
- Documents and media from other computers open in one click
Manage connections
See and control every connection on this Mac.
Each workspace this Mac is connected to has its own connection and its own Runner process. Open Local connections from the menu bar to check which are connected, then disconnect or reconnect one workspace.
- One connection per workspace, each with its own status
- Disconnect or reconnect one workspace
- A summary in the menu bar, details one click away
Desktop app vs web app
| Web app | Desktop app | |
|---|---|---|
| Agents, models, quota, projects, tasks and mobile access | Yes | Yes, it is the same workspace |
| Open a file from a task preview | Preview in the browser or download | Also show in Finder or open with your default app |
| Files created on another computer | Preview or download in the browser | One click to open in your default app |
| Connecting this computer | Install a Runner with a command | Sign in, then choose Connect |
| Managing connections on this computer | Settings in each workspace | One Local connections panel for every workspace on this Mac |
Install OpenTandem on Mac
- Download the version for your Mac: Apple silicon for Macs with an M-series chip, Intel for older Macs.
- Open the downloaded file and move OpenTandem to your Applications folder.
- Open OpenTandem, sign in in your browser, and choose Connect when the app asks.
Not sure which chip your Mac has? Open the Apple menu, choose About This Mac, and look at Chip (Apple M…) or Processor (Intel).
Install OpenTandem on Windows
- Download the Windows version (a .zip file, Windows 10 or later, 64-bit).
- Right-click the downloaded file, choose Extract All, and extract it to a folder you will keep.
- Open the folder and double-click OpenTandem.exe, then sign in in your browser and choose Connect when the app asks.
If you see “Windows protected your PC”
The Windows app is not code-signed yet, so Microsoft Defender SmartScreen may stop it the first time you open it. This only happens once.
FAQ
Desktop app FAQ
Systems, chips, installation and how the desktop app differs from the web version.
Does OpenTandem have a desktop app?
Yes. The OpenTandem desktop app is available for Mac, for both Apple silicon and Intel, and for Windows 10 and later (64-bit). The web version also works in any browser on any system.
How do I know whether my Mac uses Apple silicon or Intel?
Open the Apple menu and choose About This Mac. If it lists a Chip such as Apple M1 or later, download the Apple silicon version. If it lists a Processor made by Intel, download the Intel version.
What is different between the desktop app and the web app?
The workspace is the same, so agents, models, quota, tasks, projects and mobile access work the same way. The desktop app adds local file actions, such as showing a file in Finder or opening it with your default app, and a Local connections panel in the menu bar for managing this Mac’s connections.
Do I need to install a Runner separately?
No. The desktop app includes a built-in Runner. After you sign in, choose Connect when the app asks, and this Mac joins your workspace. Only workspace admins can connect a computer.
Is there a Windows app?
Yes. Download the Windows version, extract the .zip file and open OpenTandem.exe. The Windows app is not code-signed yet, so the first time you open it Windows may show “Windows protected your PC”. Click More info, then Run anyway.
Is the Mac app signed by Apple?
Yes. The app is signed and notarized by Apple, so macOS can verify it when you open it for the first time.