Don't Double Book Me stops at Google and Outlook. CalendarPipe also speaks Apple.
Don't Double Book Me does one thing well: real-time sync between Google and Outlook calendars, with working hours and privacy templates. CalendarPipe covers Apple Calendar and ICS feeds too, runs your rules as JavaScript in a sandbox, delivers events as plain calendar invitations, and has a plan that's free forever.
- Free forever plan
- 14-day Pro trial
- No credit card to start
- 2 min setup
Where Don't Double Book Me falls short
Don't Double Book Mehas strengths, but here's what users run into.
No Apple Calendar support
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.
Rules are toggles and templates, not logic
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.
No API or developer tooling
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.
No free plan — just a 1-week trial
Don't Double Book Me gives you a 7-day free trial, then it's $20/year. There's no permanent free plan to fall back on when your needs are light.
Why teams switch to CalendarPipe
Apple Calendar, included
Full Apple Calendar / CalDAV support, plus ICS feed subscriptions — not a roadmap promise. Google, Outlook, and Apple are all first-class in CalendarPipe.
Rules are code, not checkboxes
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.
Free forever, never a trial cliff
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.
Built for developers and agents
A REST API and an MCP server for AI agents. CalendarPipe can even host calendars an AI agent owns outright — its own address, driven by the API. There if you ever need it.
Feature comparison
CalendarPipe vs Don't Double Book Me — side by side.
| Feature | CalendarPipe | Don't Double Book Me |
|---|---|---|
| Google Calendar | Yes | Yes |
| Outlook / Microsoft 365 | Yes | Yes |
| Apple Calendar / iCloud | Yes | No |
| ICS / internet calendar feeds | Yes | No |
| Programmable sync rules (JavaScript) | Yes | No |
| Event filtering & transformation | Full (JS sandbox) | Working hours & templates |
| Invitation-based delivery | Yes | No |
| REST API | Yes | No |
| MCP server for AI agents | Yes | No |
| Free-forever plan | Yes | No |
| Real-time webhook sync | Every 5 min (Pro) | Yes |
| Booking / scheduling links | No | Yes |
Pricing, side by side
What you pay — and what each plan actually gets you.
Don't Double Book Me
Personal
Unlimited syncs · Google & Outlook · 1-week trial
Team
Minimum 3 seats · consolidated billing · priority support
No free plan — 1-week trial only. Pricing as of August 2026.
CalendarPipe
Free
2 calendars · 1 sync rule · free forever
Pro
Unlimited calendars & rules · $3.33/mo billed annually
Free forever, or a 14-day Pro trial.
Don't Double Book Me is cheaper if two Google or Outlook calendars are all you sync. CalendarPipe is free to start, adds Apple and code-level rules, and only costs more when you need more.
When Don't Double Book Me is the better choice
We'd rather you pick the right tool than the one we sell.
You need changes to propagate in seconds
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.
You want booking links in the same product
Don't Double Book Me doubles as a Calendly alternative, with booking links built in. CalendarPipe has no scheduling pages at all and isn't planning them.
Two Google or Outlook calendars is the whole job
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.
Switching from Don't Double Book Me is low-risk
There's no data to move and no hard cutover. Run CalendarPipe alongside Don't Double Book Me, then switch over only once you're ready.
- 1
Run both side by side
CalendarPipe and Don't Double Book Me don't conflict. Keep Don't Double Book Me running while you set CalendarPipe up and test it — there's no rush to switch.
- 2
Nothing to export or import
There's no data migration. CalendarPipe reads from the calendars you connect, so your events stay where they are. You're recreating sync rules, not moving data.
- 3
Live in about two minutes
Connect your calendars, pick a template or describe a rule in plain English, and you're syncing. Cancel Don't Double Book Me once CalendarPipe does what you need.
Frequently asked questions
Common questions about switching from Don't Double Book Me.
Is CalendarPipe a replacement for Don't Double Book Me?
Does CalendarPipe sync Apple / iCloud calendars?
Is Don't Double Book Me cheaper than CalendarPipe?
Does CalendarPipe sync in real time like Don't Double Book Me?
Does CalendarPipe have booking links?
Ready to switch from Don't Double Book Me?
Two minutes to set up. Free forever plan, no credit card. Or try Pro free for 14 days.