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Spec{0}

Install Spec0

Spec0 is a desktop app. Today it runs on Apple Silicon Macs. Windows and Linux builds are planned.

Download

  1. Open spec0.dev and click Download for macOS.
  2. Open the .dmg and drag Spec0 into your Applications folder.
  3. Launch Spec0 from Applications. If macOS asks to confirm, that’s the normal first-run prompt — confirm once and you won’t see it again.

That’s it. You don’t need an account. There is no signup flow, no email verification, no cloud sync.

What ends up on your machine

  • The Spec0 app itself in /Applications/Spec0.app.
  • Your data in ~/Library/Application Support/Spec0/ — projects, cards, the event log, the MCP server config. Everything stays on this directory; nothing is uploaded anywhere.

If you ever want to wipe Spec0 and start clean, deleting that folder removes all your data.

System requirements

  • macOS 12 (Monterey) or newer on Apple Silicon (M1 or later).
  • About 250 MB of disk space.
  • Node.js is not required — Spec0 ships everything it needs.

Verify the download (optional)

Each release page on spec0.dev lists a SHA256SUMS file plus a GPG signature. If you’d like to verify your download:

Terminal window
shasum -a 256 ~/Downloads/Spec0-*.dmg

Compare the output against the value in SHA256SUMS for that release.

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