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Worldline
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Your calendar, habits
and projects. Yours.

A calendar you type into, habits tracked over years, and a writing space for long projects — with equations and code. On your Mac and iPhone, synced end-to-end encrypted. Free, no account, no server.

Download for Mac
Version 0.11.3 · 12 MB · macOS 11 or later · Apple silicon and Intel
Open Worldline
Free · works offline · iOS 16.4 or later

✓ Downloading Worldline.dmg — then:

  1. Open Worldline.dmg and drag Worldline onto Applications.
  2. Open Worldline. The first time, macOS says it can't check the app (it isn't from the App Store) — click Done. Worldline is free and open source, so it isn't registered with Apple's paid program.
  3. System Settings → Privacy & Security, scroll down, click Open Anyway. Only once — after that it opens normally and updates itself.
Prefer Terminal? One line installs it and skips steps 2–3 (Terminal downloads aren't flagged):
curl -fsSL https://worldline-calendar.github.io/worldline/install.sh | sh

Worldline on your iPhone

  1. Point your iPhone's camera here and open the link in Safari.
  2. Tap Share → Add to Home Screen.
  3. Open it from your Home Screen. It works offline; pair it with your Mac in Settings → Sync.
Or open worldline-calendar.github.io/worldline/app on the phone.

Add it to your Home Screen

  1. Tap Open Worldline above, in Safari.
  2. Tap Share → Add to Home Screen.
  3. Open it from your Home Screen. No App Store, nothing to pay; works offline.
Worldline's week view: events from several calendars, deadlines drawn as runways across the top, and the sidebar with this month, tasks and deadlines
The same calendar on an iPhone, three days at a time

Quick add

Type it, and it's on your calendar.

One box for events, tasks and deadlines, in plain English — with a preview of exactly what you'll get before you press Return.

  • lunch with Sam tomorrow 12:30 #social for 90 min
  • Change things the same way: move Alex's meeting to tues at 3pm, skip gym this week
  • Reminders before events, as Mac notifications
Quick add with “lunch with Sam tomorrow 12:30 #social for 90 min” typed, previewing an event on Wednesday from 12:30 to 2 PM in the Social calendar

Deadlines

Deadlines you can't miss.

A deadline isn't a dot on one day: it's drawn as a runway across the weeks you should be working on it, and it gets louder as the day comes — green, yellow, orange, then red in the last 48 hours.

  • A checklist of steps for each one, with their own due dates
  • The colours and when they change are yours to set
  • A reminder before it's due
Deadlines drawn as coloured runways across the week — red for one due tomorrow, orange, yellow — and a deadline's panel with its checklist

Calendars

Every calendar you have, both ways.

The calendars already on your Mac — iCloud, Google, Exchange — show up and can be edited here; changes go back to them.

  • Subscribe to any iCal link: seminars, a team's schedule, a Google calendar
  • Repeating events, time zones and travel handled properly
  • Export any calendar as an .ics file, back everything up in one file
The month view of October, with meetings, all-day events and multi-day events from several calendars

Habits

Habits that hold up over years.

Strength instead of a fragile streak: missing one day doesn't wipe out months. Every year of history stays.

  • Daily, a few times a week, or an amount (pages, minutes)
  • Rest days that don't count against you
  • Ticks itself from your calendar (“counts gym events”)
Three habits — Gym, Read and Meditate — each with its strength, streak and a year of history as a grid of days

Projects

Projects you write in.

Long-running work as pages and dated notes. Worldline gathers what's in them: your to-dos, the ideas you jotted, who you're waiting on and what's still open.

  • LaTeX equations, inline and displayed
  • Code blocks with syntax colours — Python, Bash, C++, Julia, Fortran, SQL…
  • Search across every page and note
A project page with a methods draft, a displayed equation for the waiting-time distribution and a Python code block

Mac and iPhone

On your phone too — synced, encrypted.

Pair your iPhone with a QR code. Changes go between your devices end-to-end encrypted, through public relays that only ever see ciphertext.

  • Works offline on both; catches up when it's back
  • The iPhone app opens from Safari — no App Store, nothing to pay
  • No account: the pairing code is the only key
The calendar on an iPhone
Habits on an iPhone

And the rest

Scheduling linksLike Calendly and when2meet: guests pick a time or mark when they're free. No sign-up, no email.
Travel-proofAll-day events stay on their day; a weekly 3 PM meeting stays 3 PM in its own time zone wherever you are.
Backups and undoA daily snapshot on the Mac, one-file backups, and ⌘Z for everything.
Keyboard firstShortcuts for everything, and events and tasks reachable with Tab for screen readers.
Fast with years of dataTested with ten years of events, habits and notes: typing and switching views stay instant.
Updates itselfSigned updates arrive within a day; the iPhone app refreshes on its own.

Yours, and free — for everyone.

Everything stays on your devices. No account, no tracking, no server — and the code is open (MIT).

Download for Mac Read the docs
Worldline · MIT licence
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