What Is an iCal Subscription Link? (And How to Use One)

You've probably seen a button that says "Add to Calendar" or received a link that starts with webcal:// and wondered what to do with it. That's an iCal subscription link — and once you understand how it works, you'll never go back to manually copying events into your calendar again.

This guide explains exactly what an iCal subscription link is, how it differs from downloading a calendar file, how to use one in every major calendar app, and what to do when things go wrong.

What Is an iCal Subscription Link?

iCal (short for iCalendar) is an open standard format for calendar data, defined in RFC 5545. Files in this format use the .ics extension and can be read by virtually every calendar application in existence — Apple Calendar, Google Calendar, Outlook, Thunderbird, Fastmail, and hundreds of others. It's been around since 1998, which is why it's so universally supported.

An iCal subscription link is a URL that points to a live .ics file hosted on a server. When you subscribe to it, your calendar app doesn't just download the events once — it saves the URL and periodically fetches it again to check for updates. That means if the person or organization who created the calendar adds, changes, or removes events, those changes will eventually appear in your calendar automatically.

This makes iCal subscription links ideal for any calendar you don't control yourself: a sports league schedule, a school's academic calendar, a team's work schedule, a conference agenda, or a friend's shared calendar. Instead of asking someone to "send me the updated schedule" every few weeks, you subscribe once and stay current.

webcal:// vs. https:// — What's the Difference?

If you've seen iCal links, you've probably noticed they sometimes start with webcal:// instead of the usual https://. These two are almost identical — webcal:// is simply https:// with a custom URL scheme registered with your operating system.

When your browser or OS encounters a webcal:// link, it knows to hand it off to a calendar application rather than open it in a browser tab. On a Mac, clicking a webcal link opens Apple Calendar directly. On iPhone, it prompts you to add the subscription. It's a convenience mechanism — the underlying data transfer still happens over HTTPS.

In practice, both schemes point to the same file. These two links are equivalent:

• webcal://example.com/calendar/schedule.ics
• https://example.com/calendar/schedule.ics

Most modern calendar apps accept either format when you paste a link manually. If a webcal:// link isn't working, try swapping the scheme to https:// — it almost always resolves the issue. This is especially common when pasting links into Google Calendar, which sometimes prefers the https:// format.

What Does an iCal Subscription Link Look Like?

Here are some real-world examples of what subscription URLs look like:

• webcal://example.com/calendar/abc123.ics — a typical self-hosted calendar
• https://calendar.google.com/calendar/ical/abc123%40group.calendar.google.com/public/basic.ics — a public Google Calendar feed
• webcal://p09-caldav.icloud.com/published/2/abc123/calendar.ics — a shared iCloud calendar
• https://syncourschedule.com/cal/your-unique-id.ics — a calendar published through Sync Our Schedule

The key identifiers: the URL typically ends in .ics, and it either starts with webcal:// or points to a calendar service's domain. The long string of characters in the middle is usually a unique identifier that makes your specific calendar URL hard to guess, providing a basic level of privacy.

How to Subscribe in Each Calendar App

The steps vary slightly by app, but the concept is the same everywhere: find the "subscribe" or "add from URL" option, paste the link, and confirm.

Apple Calendar (Mac)

1. Open Apple Calendar.
2. In the menu bar, click File → New Calendar Subscription.
3. Paste the iCal subscription URL into the field and click Subscribe.
4. Give the calendar a name, choose a color, and set how often you want it to auto-refresh (every 5 minutes, every hour, every day, or manually).
5. Click OK. The calendar will appear in your sidebar under "Other."

Apple Calendar (iPhone / iPad)

1. Open the Settings app — not the Calendar app itself.
2. Scroll down and tap Calendar → Accounts → Add Account.
3. Tap Other at the bottom of the list.
4. Tap Add Subscribed Calendar.
5. Paste the subscription URL and tap Next.
6. Confirm the details and tap Save. The calendar will appear in your Calendar app.

Google Calendar (Web)

1. Open Google Calendar in your browser.
2. In the left sidebar, find Other calendars and click the + button next to it.
3. Select From URL.
4. Paste the subscription URL (use https:// if webcal:// doesn't work) and click Add Calendar.
5. The calendar will appear in your sidebar. It may take a few minutes for events to load the first time.

Outlook (Desktop App)

1. Open Outlook and go to the Calendar view.
2. In the toolbar, click Add Calendar.
3. Select From Internet.
4. Paste the subscription URL and click OK.
5. Click Yes when prompted to add and subscribe to the calendar.

Outlook.com (Web)

1. Open outlook.com and click the calendar icon in the sidebar.
2. Click Add calendar in the left panel.
3. Select Subscribe from web.
4. Paste the subscription URL, give it a name, choose a color, and click Import.

How Often Does It Sync?

This is one of the most common sources of confusion. Each calendar app decides on its own how often to re-fetch the subscription — you generally can't force a specific app to sync on demand (with some exceptions).

Google Calendar's 12–24 hour cache is worth understanding if you're sharing time-sensitive schedules. Google caches the .ics file on their servers and doesn't re-fetch it frequently, so even if the source calendar is updated immediately, Google Calendar users may not see the change until the next day. This is a known limitation of Google's implementation — there's no workaround on the subscriber's end.

For Apple devices, pulling down to refresh in the Calendar app will usually trigger an immediate re-fetch. If you're on a Mac, you can right-click the subscribed calendar in the sidebar and choose Refresh.

How to Create Your Own iCal Subscription Link

If you want to share a calendar that others can subscribe to, you have a few options depending on your situation.

Google Calendar lets you make any calendar public and share it as an iCal link. Go to your calendar's settings, find the "Integrate calendar" section, and copy the "Public address in iCal format." This works well for personal use, but it requires your calendar to be fully public — anyone with the link can see all your events.

Apple Calendar / iCloud lets you share calendars with specific people, but the shared link is private to those invitees. There's no easy way to publish a subscribe-able link that you can hand out broadly.

Outlook offers similar publish-to-web functionality for personal calendars, though the feature varies between the desktop app and Outlook.com.

For organizations sharing a calendar with a large group — a sports team, a school, a club, a business — these individual-app solutions get messy quickly. That's where a dedicated tool like Sync Our Schedule comes in. You build and manage your calendar in one place, and every subscriber gets a clean, reliable iCal link that works in any calendar app. When you update an event, it propagates to all subscribers automatically — no app-specific setup required on your end.

Common Problems and Fixes

The link doesn't work at all

First, check the URL scheme. If it starts with webcal://, try replacing that with https:// and paste it again. If the link was shared via a messaging app, make sure the full URL wasn't cut off — long URLs sometimes get truncated. Try opening the URL directly in a browser to confirm the .ics file loads (you may see a download prompt or raw text).

Events aren't updating

If you're using Google Calendar, this is almost certainly the 12–24 hour cache issue described above. There's nothing you can do to speed it up on Google's end. For Apple Calendar, try right-clicking the calendar and selecting Refresh. On iPhone, pull down on the calendar view. If events still don't appear after 24 hours, try unsubscribing and re-subscribing — this forces a fresh fetch.

The calendar isn't appearing after I subscribed

Check that the calendar is enabled (has a checkmark or is toggled on in your calendar list). In Apple Calendar, subscribed calendars appear under "Other" and can be hidden. In Google Calendar, check the left sidebar — the calendar may be present but unchecked. If it's completely missing, try unsubscribing and subscribing again.

I'm getting duplicate events

This usually happens if you both imported a .ics file manually and subscribed to the same link. Find and delete the imported calendar (the static copy) and keep only the subscription. The events from the import won't disappear automatically — you'll need to delete that calendar specifically.