For almost every team, yes - AddEvent is significantly cheaper than building Add to Calendar functionality in-house once you factor in development time, cross-platform maintenance, and the ancillary features you'd also need to build.

What you'd actually need to build

A production-ready Add to Calendar implementation isn't just generating an .ics file. To match what AddEvent provides, you'd need to build:

• Correct URL formats for Google Calendar, Apple Calendar, Outlook.com, Office 365, and Yahoo (each uses a different format)
• .ics file generation with correct iCal syntax for desktop calendar imports
• Timezone handling across all time zones and DST transitions
• A hosted event landing page with responsive design
• An RSVP form with confirmation emails and attendee data storage
• Analytics to track Add to Calendar clicks
• Ongoing maintenance as calendar platforms update their URL formats and standards

Estimated development cost:

• Initial build: 40–80 hours at typical developer rates ($100–$150/hr) = $4,000–$12,000
• Ongoing maintenance (platform changes, bug fixes): 10–20 hours/year = $1,000–$3,000/year

AddEvent Small Business: $29/month = $348/year

Includes 2,500 Add to Calendar clicks per month, all calendar platform compatibility maintained, hosted landing pages, RSVP tools, subscription calendars, analytics, Zapier integration, and ongoing platform updates.

What you get that DIY doesn't cover without significant extra cost

• RSVP collection with confirmation and reminder emails
• Embeddable calendar widget for your website
• Subscription calendar sync for ongoing audiences
• QR code generation
• All handled on AddEvent's infrastructure, not yours

For early-stage teams testing the concept, the free Hobby plan ($0) makes the comparison even clearer.