Calendar sync apps compared
If you live in more than one calendar, you need each one to know when you're busy in the others. Here's how the main options compare on price, free plans and the calendars they cover.
Updated November 12, 2026
Side by side
| Product | Free plan | Paid, per month | Calendars |
|---|---|---|---|
| Syncydo | 2 calendars, no time limit | $3.99 for 5 calendars $6.99 for 10 | Google, Outlook and Microsoft 365, Zoho, iPhone and Android calendars |
| OneCal | 14-day trial | $5 for 2 calendars $10 for 5 $25 for 50 billed yearly | Google, Outlook, iCloud |
| CalendarBridge | None | From $4, billed yearly, for 2 calendars | Google, Outlook |
| SyncThemCalendars | 14-day trial | $3.99 | Google, Microsoft 365, iCloud |
| Reclaim | 1 calendar sync | From $10 a seat, billed yearly | Google, Outlook |
| Notion Calendar | Free | Free | Google, Outlook, iCloud |
| Fantastical | Mirroring is a paid feature | $6.99 | Apple and Windows apps |
Prices and plans checked on each product's own website on November 10, 2026. They change, so check before you buy. Prices in US dollars. Clockwise closed on March 27, 2026.
How to choose
- You want it free, with no clock running: Syncydo covers 2 calendars for as long as you like. Notion Calendar is free too, as part of its own calendar app.
- You have a Zoho calendar, or calendars that only live on your phone: Syncydo covers both.
- You want your AI assistant to see every calendar: Syncydo connects Claude, ChatGPT and Gemini, read-only, on Plus and Pro.
- You want booking pages or automatic scheduling as well: OneCal and Reclaim include those.
- You already live in a Mac calendar app: Fantastical mirrors calendars inside the app you use.
One product at a time
- Syncydo and OneCalFree plan against a 14-day trial, and what each covers.
- Syncydo and CalendarBridgeTwo ways to keep Google and Outlook in step.
- Syncydo and ReclaimCalendar sync on its own, or as part of a scheduling tool.
- After ClockwiseClockwise closed in March 2026. Here's how to keep your calendars in step now.
Questions
What does a calendar sync app do?
It copies your busy time from one calendar into your others, so anyone booking you in any of them sees you're taken. Good ones keep the details private and remove their holds if you stop using them.
Is there a free calendar sync app?
Yes. Syncydo is free for 2 calendars with no time limit and no card. Notion Calendar is also free and can block time between the calendars you connect to it.
Do these apps show my personal events to my employer?
With Syncydo, no. Your work calendar gets a hold that says Busy, and only you see what it is. On paid plans you can choose other wording if you want.