Add to Calendar links outperform .ics file attachments in almost every scenario. A single Add to Calendar link works across all calendar platforms from one URL and stays editable after you send it.

Why Add to Calendar links win

One link, all platforms A single AddEvent link lets the user choose their calendar - Google, Apple, Outlook, Office 365, Yahoo - and handles the correct format for each. An .ics file only works for desktop calendar apps that can open it, and behavior varies significantly across email clients.

Updatable after sending If your event changes - venue, time, Zoom link - you update it in AddEvent and the change is reflected everywhere. An .ics file attached to an email is frozen the moment it's sent. Everyone who downloaded it has outdated information.

Mobile-friendly .ics files behave inconsistently on mobile. On iOS, they sometimes open the file browser instead of the Calendar app. On Android, results vary by email client. An Add to Calendar link presents a clean, guided choice for every device and browser.

No spam filter risk Some email spam filters flag .ics attachments as potentially suspicious. Add to Calendar links are plain URLs - no attachment, no flag.

Better UX An .ics file requires the user to: find the downloaded file → open it → confirm the import. An Add to Calendar link takes them through a guided two-step flow: click → pick calendar app → done.

When .ics still makes sense

If your audience is a technical user base (developers, IT teams) who prefer to import events directly, or if you're sending to a corporate Outlook environment where IT policies make browser-based flows complex, an .ics file as a fallback download option is a reasonable addition alongside your main Add to Calendar link.