Calen is an AI calendar companion for macOS that learns your patterns, integrates with Google Calendar, and helps you plan — through natural conversation.
Why Calen
Built for developers and creators who live in their calendar — and want AI that actually understands them.
Learns your preferred time blocks, energy patterns, and scheduling habits over time. Gets smarter the more you use it.
Reschedule your day, fill empty slots, auto-categorize events — all through a natural chat interface in your menu bar.
Google Calendar + Apple Calendar side by side. Todos, reminders, and AI suggestions — one place to see it all.
No windows. One click from your menu bar and your full calendar is there. Close it and it's gone.
Set range-based habits that span days or weeks. Visual progress bars on your calendar grid keep you accountable.
Your data stays on your Mac. API keys are in your Keychain. No server collects your calendar data — ever.
Deep Dive
Most AI assistants forget everything after a session. Hermes is different — it extracts long-term insights from your conversations and applies them automatically.
Type in plain language. Calen understands what you mean and takes action — creating, moving, or restructuring your day.
Weekly stats, habit streaks, and completion rates — the Review tab turns your calendar into a personal productivity dashboard.
Interactive Demo
Setup
No configuration files. No signup. Just install and connect.
Download the universal binary or use Homebrew Cask. Signed and notarized — no Gatekeeper warnings.
One-click OAuth flow. Calen only asks for the scopes it needs. Your credentials stay in your Keychain.
Paste your Claude or OpenAI API key in Settings. Then ask Calen anything — it handles the rest.
Pricing
No subscriptions. No paywalls. No telemetry.
Your calendar is already full. Let Calen help you make it intentional.