OnlyBusy
OnlyBusy vs OneCal
Last updated 3 October 2026
OneCal syncs Google, Outlook, iCloud, and CalDAV calendars and clones events between them. Its pricing page says you choose what event information to sync. OnlyBusy writes a private Busy event with the label you set, and it does not store the original title.
At a glance
| Comparison | Other approach | OnlyBusy |
|---|---|---|
| What it is for | Calendar sync, scheduling links, and a unified calendar view. | A private Busy event on each Google or Microsoft calendar you connect. |
| Scheduling Assistant | A cloned event on the target calendar can show there. You choose which information the clone carries. | The event is marked Busy and private and carries the label you set. |
| Event details | The pricing page lists choosing what event information to sync, private event controls, and an identifier on cloned events. | Title, guests, notes, and location stay on the source calendar. The title is not stored. |
| How you connect | You connect calendars and create sync configurations. A 14-day trial needs no card. | Personal sign-in for Google Calendar and Microsoft 365. |
What they are for
OneCal is a calendar sync product. As of 3 October 2026, its pricing page includes real-time sync, one-way and multi-way sync, scheduling links, and a unified calendar.
You pick it when the other calendar should hold a clone of the event, with the detail level you configure.
What OnlyBusy writes
OnlyBusy writes one private Busy event per block. The label can differ per calendar. The source title is read so you can see your own event, then dropped.
Disconnect a calendar and OnlyBusy removes the blocks it created and deletes the stored tokens for that account.
Who should stay with them
Stay with OneCal when you want cloned events, scheduling links, iCloud or CalDAV, or a unified view of every calendar.
Their pricing page says you can choose what event information to sync and that private event controls are included.
Who should add OnlyBusy
Add OnlyBusy when the other tenant should see a Busy label and nothing of the meeting itself.
OnlyBusy does not offer a unified calendar, iCloud, or CalDAV. Google Calendar and Microsoft 365 are the calendars it connects today.
Price
As of 3 October 2026, OneCal's pricing page lists Starter at $5 per user per month billed annually ($60) for 2 calendars, Essential at $10 ($120) for 5 calendars, and Premium at $25 ($300) for 50 calendars. Every plan includes a 14-day trial with no credit card. The page says there is no free plan after the trial.
As of 3 October 2026, OnlyBusy lists Free at $0 with up to 2 calendars and no scheduling links, Standard at $6 a month or $50 a year with up to 4 calendars and 4 scheduling links, and Premium at $12 a month or $99 a year with unlimited calendars and scheduling links. Teams is arranged by email at privacy@onlybusy.com.
Questions
Is OnlyBusy a OneCal alternative?
When you want a private Busy label and do not want the source title stored or copied. OneCal remains the tool when you want to clone events and choose which details travel.
Does OneCal copy event details?
Its pricing page says you choose what event information to sync, and that cloned events can carry an identifier. OnlyBusy writes the label you set and does not store the title.
Does OnlyBusy sync iCloud?
No. OnlyBusy connects Google Calendar and Microsoft 365. OneCal's pricing page lists iCloud and CalDAV as well.