Install the app

Download the signed Mac app from blowhorn.ai and verify it.

Install the app

Download the signed Blowhorn app for macOS, verify it, install it, and open it.

Early access: the app does not bundle its command-line engine yet. On first run it asks for a checkout of Blowhorn, which your Blowhorn administrator gives you access to (see First run).

Download

Download the latest build from the blowhorn-site releases, the same place the blowhorn.ai download button links:

Verify the download before you open it. With both files in the same folder:

shasum -a 256 -c SHA256SUMS.txt --ignore-missing

The line for Blowhorn-mac.dmg must read OK.

Install

  1. Open the downloaded .dmg.
  2. Drag the app to Applications.
  3. Open it from Applications. A notarized build opens without a warning.

You need macOS 13 or newer and Google Chrome. Chrome is not bundled: Blowhorn drives the Chrome profiles you already sign in to, through its Chrome extension, which you add to each Chrome profile you post from (Install the Chrome extension).

First run

The app opens on its Setup screen and checks, in order, the Blowhorn checkout, its Python environment, the connection to your organization's data, your Chrome profile mappings (Map Blowhorn profiles to Chrome profiles), and the background service. Each row says what it found, or what to do next. Every row is described under Setup in The Blowhorn app, screen by screen.

Then check sessions and run a dry-run post. Nothing is published until you post without --dry-run.

Early access: signing in with your Blowhorn account and a bundled engine that needs no checkout are still being built. When they ship, they replace the checkout and Python rows.

Update

Updates come from the same releases page. The app installs an update and relaunches when this machine can reach the releases; otherwise it opens the release page and you download the newer .dmg and drag the app over the old copy. The background service and your settings are kept.

Last modified October 9, 2026: docs: sync from master (5f4e718)