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Calen menu bar screenshot

Latest release MIT license macOS 14+

Calen

Menu bar calendar planner for macOS with Google Calendar, Apple Calendar, Reminders, and local Claude/Codex CLI scheduling suggestions.

brew install --cask oyeong011/calen/calen-ai

What it does

Plan Sync Assistant Updates
Find free slots, move unfinished tasks, drag events Google Calendar, Apple Calendar, Reminders Uses your locally installed Claude Code or Codex CLI Sparkle auto-update

Example workflows:

  • Find a 30-minute Monday slot for a long-term goal.
  • Move unfinished todos into tomorrow's open blocks.
  • Ask "plan me 3 study blocks around Thursday's meetings".

Install

Homebrew (recommended)

brew install --cask oyeong011/calen/calen-ai

Homebrew official registration (Homebrew/homebrew-cask) is pending — Calen needs to meet Homebrew's notable criteria first. Install through the project tap until then.

Direct download

  1. Download Calen-0.2.3-universal.dmg from Releases
  2. Drag Calen.app to /Applications
  3. Launch from Launchpad

Enable AI features (optional)

Install Claude Code or Codex CLI:

brew install claude-code       # or:
npm install -g @openai/codex

"앱이 확인되지 않음" 경고 시 (Google OAuth)

Calen is currently undergoing Google OAuth verification (1–6 weeks). Until verified, you'll see a warning during sign-in. Workaround:

  1. Click "Advanced" on the warning screen
  2. Click "Go to Calen (unsafe)"
  3. Proceed with normal consent

The app is properly code-signed and notarized by Apple. The warning only means Google's review hasn't completed yet.

Requirements

  • macOS 14 Sonoma or later
  • Universal binary (Apple Silicon + Intel)

Comparison

Fantastical / BusyCal Calen
Positioning Full calendar suite Menu bar planner + local CLI assistant
Pricing Subscription Free, MIT
AI scheduling None Uses your local Claude/Codex CLI
Apple Calendar Yes Yes
Google Calendar Yes Yes
Dock icon Yes Menu bar only

Calen is intentionally narrower — it's for developers who already trust their terminal tools and want a lightweight planning surface.

Known limitations

  • Early stage (v0.2.3). Recurring event edits are limited.
  • Some UI states need polish.
  • Google OAuth verification pending (see above).
  • No iOS/iPadOS/watchOS yet (planned).

Privacy

See Privacy Policy and Terms of Service.

  • Calendar data never leaves your device except via Google Calendar API sync.
  • AI chat uses your locally installed Claude/Codex CLI — no hosted backend.
  • OAuth tokens stored in macOS Keychain (WhenUnlockedThisDeviceOnly, no iCloud sync).
  • Open source and MIT-licensed.

Development

See CONTRIBUTING.md for branch strategy, build commands, and release process.

License

MIT © 2026 Oyeong Gwon