dCal — A local-first calendar

dCal is a planner you buy once. See plans that cross month boundaries in a four-week view, write unlimited notes on any day, and keep all of it on your Mac and iPhone — no cloud, no account, no subscription. One purchase covers both.

■ Truly local — proven, not just promised
dCal has no network connectivity. macOS App Sandbox denies the app any network entitlement, so it cannot reach any server technically. Perfect for confidential meetings, sensitive client schedules, or anyone who values their privacy.

■ See four weeks at a glance
The signature 3–6 week grid view shows long-running projects as continuous lines, never broken at month boundaries — something Apple Calendar can't do.

■ Notes, not just events
Each day cell can hold unlimited rich text — meeting minutes, work logs, family notes. Bold, italic, underline, color formatting. Full-text search across all your notes.

■ Windows hyCalendar compatible
Opens .cal files from hyCalendar (Windows freeware) byte-for-byte unchanged. Edit on Mac, save, and the file remains identical.

■ Japanese holidays built-in
Including substitute holidays and citizens' holidays. Computed from the official rules; no online lookup required. Valid 1980–2099.

■ Fast search
Find any keyword across day notes and period event titles, with the matches highlighted.

■ Jump to any date
Year scroller + 12-month grid. Two taps to reach any past date.

■ Mac + iPhone — sync your way
Use iCloud Drive, Dropbox, Google Drive, OneDrive — your choice. dCal itself never talks to those services; it just reads the file your sync client provides.

■ Plain text forever
No proprietary binary. Your .cal file remains human-readable. Even without dCal in 20 years, your data lives on.

■ Native Apple experience
Modern macOS / iOS design language. Glass materials, rounded cards, system fonts, Dark Mode.

Designed for:
• Lawyers, accountants, tax advisors with confidentiality obligations
• Doctors, therapists, anyone handling sensitive personal data
• Executives managing private meetings
• Privacy-conscious users
• Existing Windows hyCalendar users moving to Apple
• Anyone frustrated by Apple Calendar's monthly cut-off

Principles:
• No account required, no subscription
• No analytics, no tracking
• One-time purchase
• Your data is your data