Don't Double Book Me stops at Google and Outlook. CalendarPipe also speaks Apple.

Don't Double Book Me syncs Google and Microsoft Outlook only. Apple Calendar / iCloud is on their roadmap, not in the product — so if your personal calendar lives on iCloud, it can't be part of the sync.

You get working hours, time rounding, privacy modes, and title templates with {{title}} / {{description}} / {{location}} placeholders. That covers simple cases, but you can't filter by keyword or attendee, write conditional logic, or transform events with code.

Don't Double Book Me has no REST API, no webhooks for your own automations, and nothing for AI agents. It's a finished product, not a building block.

Don't Double Book Me gives you a 1-week free trial with no card required, then it's $20/year. There's no permanent free plan to fall back on when your needs are light.

Full Apple Calendar / CalDAV support, plus ICS feed subscriptions — not a roadmap promise. Google, Outlook, and Apple are all first-class in CalendarPipe.

Write JavaScript gate functions that run in a secure sandbox: filter events by any field, rewrite titles, strip attendees, route conditionally, skip weekends. Prefer not to code? Use the visual builder or describe the rule in plain English.

CalendarPipe's free plan never expires — 2 calendars, 1 sync rule, no time limit. Don't Double Book Me gives you 7 days, then it's pay or leave.

A REST API and installable agent skills. CalendarPipe can even host calendars an AI agent owns outright — its own address, driven by the API. There if you ever need it.

Don't Double Book Me uses webhooks, so an event you accept shows up on the other calendar almost immediately. CalendarPipe syncs on an interval — every 15 minutes on Free, every 5 minutes on Pro. If sub-minute propagation is the requirement, they're faster.

Don't Double Book Me positions itself as a Calendly alternative first. CalendarPipe's booking pages stay lean — a free-slot picker, a real email invitation, cancel links for both sides — with no rescheduling flow, custom questions, or embeds. If booking is the main event, theirs is the more complete one.

Don't Double Book Me Personal is $20/year for unlimited syncs between Google and Outlook — cheaper than CalendarPipe Pro. If you'll never touch Apple Calendar, ICS feeds, code-level rules, or an API, you'd be paying CalendarPipe for range you don't use.