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Install help

Install Fireball Sidecar on a Mac

For macOS 15 Sequoia or later, on Apple silicon or Intel. Fireball Sidecar is notarized by Apple and updates itself.

You need

  • macOS 15 Sequoia or later.
  • About 300 MB free.

Install

The usual Mac way: drag it to Applications.

  1. Open the download

    Double-click FireballSidecar.dmg in Downloads. A window opens.

  2. Drag it to Applications

    Drag Fireball Sidecar onto the Applications folder in that window.

    Fireball Sidecar
    Fireball Sidecar
    Applications
    Illustration: Fireball Sidecar

  3. Open it

    Open it from Applications (or Spotlight: ⌘ Space, then type its name). The first time, macOS checks it and asks if you're sure. Click Open.

    macOS

    “Fireball Sidecar” is an app downloaded from the Internet. Are you sure you want to open it?

    Apple checked it for malicious software and none was detected.

    CancelOpen
    Illustration: macOS

The first time it opens

Sidecar opens to sign-in: use your Fireball account, and your chats, library and files are there.

If something's off

macOS says it can't check the app for malicious software.
That only happens with a copy that didn't come from this page. Delete it and download again from here.
How do I update?
Fireball Sidecar checks by itself and installs updates when you quit it. To check now, use the app menu ▸ Check for Updates.
How do I remove it?
Quit it, then drag Fireball Sidecar from Applications to the Trash.

Still stuck? .