Installation

Klack currently supports release installs on macOS for Apple silicon and Intel. It has been developed against Slack 4.50.143 and requires Node.js 24 or newer.

Download Klack

The installer selects the release for your Mac, verifies its SHA-256 checksum, and adds a launcher at ~/.local/bin/klack. It does not patch Slack yet.

curl -fsSL https://klack.sh/install | sh

Quit Slack completely

Use Slack → Quit Slack and confirm no other Slack copy is running. Klack intentionally refuses to modify an app while Slack is open.

Inspect before changing anything

~/.local/bin/klack status
 
# Use a separate app path while testing:
~/.local/bin/klack status --app "$HOME/Applications/Slack-Klack.app"

Install the bootstrap

~/.local/bin/klack install
 
# Or install into a disposable copy:
~/.local/bin/klack install --app "$HOME/Applications/Slack-Klack.app"

To download Klack and patch Slack in one command, add --install to the installer:

curl -fsSL https://klack.sh/install | sh -s -- --install

Restore Slack

Quit every Slack copy, then run:

klack uninstall
 
# Match the custom app path if you used one:
klack uninstall --app "$HOME/Applications/Slack-Klack.app"

For protected canonical installs, Klack restores the complete vendor-signed bundle it preserved. Directly writable copies restore the original ASAR but remain ad-hoc signed.

Build from source

Source builds additionally require pnpm. Clone the repository, run its checks, then use pnpm klack in place of the release launcher.

git clone https://github.com/zygimantass/klack.git
cd klack
pnpm install
pnpm check
pnpm test
pnpm klack status

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