About hash-calendar

Last updated: March 2, 2026

Project Purpose

hash-calendar started as a privacy-first, client-only calendar that stores state in the URL hash for instant sharing. It has since evolved into a full calendar platform with optional cloud sync, a booking/scheduling system, multi-calendar management, version history, and subscription billing — while still offering the original free URL-hash mode with no account required.

Trust Signals

• No account required for core URL-hash mode.
• URL hash data is not sent in standard HTTP requests.
• Cloud data is secured with Supabase Row Level Security (RLS) — users can only access their own data.
• Dodo Payments handles all card details — hash-calendar never sees or stores payment information.
• Optional password-based encrypted links are supported.
• Cloud account and all associated data can be permanently deleted at any time.
• Privacy-first app under the MIT license.

This app is intended for convenience and privacy, but shared links are still sensitive. Treat calendar links like private data.

Features

• Day, Week, Month, Year, Agenda, Timeline, and Analytics views
• Share calendars via link or QR code
• Password-protect shared calendars
• Optional cloud sync across devices
• Multi-calendar management
• Version history for cloud calendars
• Booking and scheduling system with public booking links
• Import/export ICS files and JSON data
• Focus mode, command palette, and template gallery
• World planner for multi-timezone coordination
• Multi-language support and dark mode
• Offline capable (PWA)

Pricing

• Free: Full URL-hash calendar with no account required.
• Cloud trial: 7-day free trial with all cloud features.
• Monthly: $1/month — billed monthly, cancel anytime.
• Yearly: $10/year — save $2 compared to monthly billing.

Maintainer

Maintained by Supun Lakmal.

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