Guide

OneCal alternatives for calendar sync (2026)

People look up OneCal alternatives when they want to sync or mirror busy time across several Google Calendars — work and personal, or a few client accounts — without paying a higher plan each time they add a calendar.

Short answer: if those calendars are Google Calendar, Resync writes hold events titled Busy, with no source titles or attendees. $1.50/month or $9/year after a 30-day free trial, no credit card required. That published price is one monthly amount and one annual amount. It does not add a per-calendar tier.

OneCal is a calendar sync product. It writes clone events onto other calendars and also ships booking links and a unified calendar view. It supports Google Calendar, Outlook, iCloud, and CalDAV. Resync is Google Calendar only. Keep OneCal when you need those other providers.

This is not the Reclaim.ai alternatives for calendar sync (2026) guide. That page is about Reclaim's AI scheduler versus busy-hold tools. This page compares OneCal-style calendar sync with CalendarBridge, Reclaim Calendar Sync, SyncThemCalendars, and Resync.

Compare the options for the sync job

Facts below were checked on each vendor's own public pricing or help page on Oct 31, 2026. Prices change. Treat the numbers as of Oct 2026 and check the vendor site before you buy. If a number was not on the page, it is left out.

Compare	OneCal	CalendarBridge	Reclaim Calendar Sync	SyncThemCalendars	Resync
Blocks time for others	Yes. Clone events block time on the target calendar.	Yes. Each sync connection writes an event copy onto the destination calendar.	Yes. Calendar Sync writes event copies onto the destination calendar.	Yes. It copies upcoming events onto the target calendar so that calendar shows you as busy.	Yes. Resync writes Busy holds onto calendars you mark as mirrors.
Calendars it writes to	Google, Outlook, iCloud, and CalDAV such as Fastmail, Nextcloud, or Zoho.	Google and Outlook. iCloud and ICS URL feeds can be sources.	Google Calendar and Outlook Calendar. iCloud only if you first share it to Google; Reclaim notes delays.	Google Calendar, Microsoft Outlook / Office 365, and Apple iCloud.	Google Calendar only.
What others see	Configurable. You can hide titles and show a custom message.	Configurable. With every detail toggle off, copies are titled busy with an empty body.	Configurable per sync policy. Busy for All shows only Busy with no details.	Configurable per field. You can hide title, description, and location behind a Busy block.	Hold titled Busy. Description, location, attendees, and conference data stay empty.
How it updates	Real-time for Google and Outlook. About 10 minutes for iCloud.	Real-time for Google and Outlook sources, typically within a minute or two. iCloud and ICS URL sources every 5 to 10 minutes.	Reclaim's Calendar Sync page says updates happen in real time as source events change.	Google and Outlook notify the service when something changes, so copies update in moments. iCloud is checked every few minutes.	Resync watches source calendars and updates or removes holds when those events change, move, or are cancelled.
How far ahead	Up to 1 year for Google and iCloud. Up to 3 months for Outlook.	The individual pricing page says unlimited synced events / all future events. No separate window is published.	Not stated on the Reclaim Calendar Sync pages we checked. The pricing page's 1 / 8 / 12 week range is for automated scheduling, not Calendar Sync.	The site says it copies upcoming events and that every plan syncs unlimited events. It does not publish a numbered window.	90 days from now.
How plans scale	By connected calendars per user: 2 on Starter, 5 on Essential, 50 on Premium.	By sync connections: 2 on Basic, 20 on Premium, 56 on Pro. A two-way pair counts as 2 connections.	By Calendar Sync count: Lite includes 1, Starter includes 3, Business includes unlimited.	By number of syncs: Basic includes 5 calendar syncs. Premium is listed for 36. Calendars and events are unlimited on every plan.	One published monthly price and one published annual price. No per-calendar tier.
What else it does	Booking links and a unified calendar view.	Unified calendar view and booking pages. Premium and Pro add an AI assistant.	AI scheduling agents including Habits, Focus Time, Tasks, and Smart Meetings, plus scheduling links.	Calendar copies only. The pages we checked do not list booking links or an AI planner.	Busy-hold sync only. No Focus Time, meeting moves, or scheduling links.
Price	Starter is $5/user/month billed annually ($60/year) for 2 calendars. Essential $10 ($120/year) for 5. Premium $25 ($300/year) for 50. 14-day trial, no credit card. No free plan after the trial.	Basic is $5/month or $4/month billed yearly ($48/year) for 2 sync connections. Premium $10/$8 ($96/year) for 20. Pro $40/$32 ($384/year) for 56. Trial; no credit card required to start. If the trial ends without a payment method, the account drops to free Basic.	Lite is free forever with 1 Calendar Sync. Starter is $10/seat/month billed yearly or $12 monthly, with 3 Calendar Syncs. Business is $15 yearly or $18 monthly, with unlimited Calendar Syncs.	Basic is $3.99/month ($47.88 billed yearly) for 5 calendar syncs. Premium is listed for 36 calendar syncs. 14-day trial, no credit card. No lasting free plan after the trial.	$1.50/month or $9/year after a 30-day free trial, no credit card required.

OneCal

Blocks time for others: Yes. Clone events block time on the target calendar.
Calendars it writes to: Google, Outlook, iCloud, and CalDAV such as Fastmail, Nextcloud, or Zoho.
What others see: Configurable. You can hide titles and show a custom message.
How it updates: Real-time for Google and Outlook. About 10 minutes for iCloud.
How far ahead: Up to 1 year for Google and iCloud. Up to 3 months for Outlook.
How plans scale: By connected calendars per user: 2 on Starter, 5 on Essential, 50 on Premium.
What else it does: Booking links and a unified calendar view.
Price: Starter is $5/user/month billed annually ($60/year) for 2 calendars. Essential $10 ($120/year) for 5. Premium $25 ($300/year) for 50. 14-day trial, no credit card. No free plan after the trial.

CalendarBridge

Blocks time for others: Yes. Each sync connection writes an event copy onto the destination calendar.
Calendars it writes to: Google and Outlook. iCloud and ICS URL feeds can be sources.
What others see: Configurable. With every detail toggle off, copies are titled busy with an empty body.
How it updates: Real-time for Google and Outlook sources, typically within a minute or two. iCloud and ICS URL sources every 5 to 10 minutes.
How far ahead: The individual pricing page says unlimited synced events / all future events. No separate window is published.
How plans scale: By sync connections: 2 on Basic, 20 on Premium, 56 on Pro. A two-way pair counts as 2 connections.
What else it does: Unified calendar view and booking pages. Premium and Pro add an AI assistant.
Price: Basic is $5/month or $4/month billed yearly ($48/year) for 2 sync connections. Premium $10/$8 ($96/year) for 20. Pro $40/$32 ($384/year) for 56. Trial; no credit card required to start. If the trial ends without a payment method, the account drops to free Basic.

Reclaim Calendar Sync

Blocks time for others: Yes. Calendar Sync writes event copies onto the destination calendar.
Calendars it writes to: Google Calendar and Outlook Calendar. iCloud only if you first share it to Google; Reclaim notes delays.
What others see: Configurable per sync policy. Busy for All shows only Busy with no details.
How it updates: Reclaim's Calendar Sync page says updates happen in real time as source events change.
How far ahead: Not stated on the Reclaim Calendar Sync pages we checked. The pricing page's 1 / 8 / 12 week range is for automated scheduling, not Calendar Sync.
How plans scale: By Calendar Sync count: Lite includes 1, Starter includes 3, Business includes unlimited.
What else it does: AI scheduling agents including Habits, Focus Time, Tasks, and Smart Meetings, plus scheduling links.
Price: Lite is free forever with 1 Calendar Sync. Starter is $10/seat/month billed yearly or $12 monthly, with 3 Calendar Syncs. Business is $15 yearly or $18 monthly, with unlimited Calendar Syncs.

SyncThemCalendars

Blocks time for others: Yes. It copies upcoming events onto the target calendar so that calendar shows you as busy.
Calendars it writes to: Google Calendar, Microsoft Outlook / Office 365, and Apple iCloud.
What others see: Configurable per field. You can hide title, description, and location behind a Busy block.
How it updates: Google and Outlook notify the service when something changes, so copies update in moments. iCloud is checked every few minutes.
How far ahead: The site says it copies upcoming events and that every plan syncs unlimited events. It does not publish a numbered window.
How plans scale: By number of syncs: Basic includes 5 calendar syncs. Premium is listed for 36. Calendars and events are unlimited on every plan.
What else it does: Calendar copies only. The pages we checked do not list booking links or an AI planner.
Price: Basic is $3.99/month ($47.88 billed yearly) for 5 calendar syncs. Premium is listed for 36 calendar syncs. 14-day trial, no credit card. No lasting free plan after the trial.

Resync

Blocks time for others: Yes. Resync writes Busy holds onto calendars you mark as mirrors.
Calendars it writes to: Google Calendar only.
What others see: Hold titled Busy. Description, location, attendees, and conference data stay empty.
How it updates: Resync watches source calendars and updates or removes holds when those events change, move, or are cancelled.
How far ahead: 90 days from now.
How plans scale: One published monthly price and one published annual price. No per-calendar tier.
What else it does: Busy-hold sync only. No Focus Time, meeting moves, or scheduling links.
Price: $1.50/month or $9/year after a 30-day free trial, no credit card required.

Sources, all OneCal pricing, OneCal Calendar Sync, OneCal FAQ, OneCal plans and trial, CalendarBridge individual pricing, CalendarBridge billing, CalendarBridge about syncing, CalendarBridge hide event details, Reclaim pricing, Reclaim Calendar Sync, Reclaim Calendar Sync overview, Reclaim 2.0 FAQ, Reclaim bidirectional policies, SyncThemCalendars, and SyncThemCalendars Google Calendar sync. Checked Oct 31, 2026.

When OneCal is the better pick

OneCal is the better pick when the job is bigger than Google busy holds. Resync cannot cover those other providers or the extra product.

You need to write copies onto Outlook, iCloud, or CalDAV, not only Google Calendar.
You want booking links and a unified calendar view in the same product.
You want a sync window of up to 1 year on Google or iCloud. Resync looks 90 days ahead.
You want to choose how much detail clone events carry, including a custom busy message.
Two calendars are enough, so Starter (2 connected calendars) matches the job.

OneCal has no lasting free plan after the 14-day trial. If you only used it to block work and personal Google Calendars, the options below compare that narrower job.

Who each option fits

OneCal. You need Outlook, iCloud, or CalDAV as a destination, you want to choose how much detail clone events carry, or you also want booking links and a unified calendar view. Plans start at $5/user/month billed annually for 2 calendars. Resync cannot cover those other providers.
CalendarBridge. You want a sync-first tool that writes copies onto Google or Outlook, with optional iCloud or ICS URL sources, and you want to turn event details off so copies are titled busy. Basic is $5/month or $4/month billed yearly for 2 sync connections, and the account can fall back to free Basic if a trial ends without a card.
Reclaim Calendar Sync. You want the AI scheduler — Habits, Focus Time, Tasks, Smart Meetings, scheduling links — and Calendar Sync onto Google or Outlook is one piece of that. Lite is free with 1 Calendar Sync. Paid plans add more syncs and a longer scheduling range.
SyncThemCalendars. You want one-way or two-way copies across Google, Outlook, and Apple iCloud, with per-field control to hide titles behind a Busy block. Basic is $3.99/month ($47.88 billed yearly) for 5 calendar syncs. Premium is listed for 36 syncs.
Resync. The calendars that get booked are Google calendars, and you want Busy holds with no source titles, attendees, or locations. $1.50/month or $9/year after a 30-day free trial, no credit card required. That price does not add a per-calendar tier. Resync does not move meetings, create Focus Time, or offer scheduling links.

How Resync's Busy holds work

Resync does not share calendars with each other. It reads when you are busy on Google calendars you mark as sources and writes hold events onto Google calendars you mark as mirrors.

Holds are titled Busy. Description, location, attendees, and conference data are left empty, so source meeting details stay on the source calendar.
When you mark calendars as both source and mirror, a booking on either calendar becomes a Busy hold on the others. That is two-way blocking between those Google calendars.
If a source event moves, Resync updates the hold. If the event is cancelled, marked free, declined, or is a working-location event, Resync does not keep a hold.
Resync looks 90 days ahead when it reads source events. Holds it writes are marked so they are not copied again.
If you delete or edit a hold, Resync records that and does not recreate it for the same source event on that mirror.
Read-only calendars cannot be mirrors. Resync currently syncs Google calendars only.

Use Resync when the calendars that get booked are Google calendars and you want Busy holds with no source titles. Use OneCal, CalendarBridge, Reclaim, or SyncThemCalendars when you also need Outlook, iCloud, booking links, or an AI planner.

Set up Resync

Sign in with GoogleOpen Resync and sign in with the Google account you want as your primary account. You land on setup.
Connect another Google accountChoose Connect another Google account and finish Google's permission screen. Resync needs at least two Google accounts before you can start.
Start syncingWhen a second account is connected, setup shows bidirectional mirroring as the intended default: real events on either side become private busy blocks on the other. Choose Start syncing to open the dashboard.
Mark sources and mirrorsIn Sync configuration, turn on Source to read busy time from a calendar and Mirror to receive Busy holds. A calendar can be both. Read-only calendars cannot be mirrors because Resync needs write access to create holds.

FAQ

What is a cheaper OneCal alternative for calendar sync?

If you only need Busy holds between Google calendars, Resync writes holds titled Busy and costs $1.50/month or $9/year after a 30-day free trial, no credit card required. That published price is one monthly or annual amount; it does not add a per-calendar tier. CalendarBridge Basic is $5/month or $4/month billed yearly for 2 sync connections, with a free Basic fallback if you do not add a card. SyncThemCalendars Basic is $3.99/month ($47.88 billed yearly) for 5 calendar syncs. OneCal Starter is $5/user/month billed annually for 2 calendars. Those other tools also cover Outlook or iCloud, which Resync does not.

Is there a free OneCal alternative?

OneCal's own pricing page says there is no lasting free plan after the 14-day trial. Reclaim Lite is free forever and includes 1 Calendar Sync. CalendarBridge drops to a free Basic tier (2 sync connections) if a trial ends without a payment method. Resync is $1.50/month or $9/year after a 30-day free trial, no credit card required. Google Calendar sharing is free, but it is a view, not a hold on the calendar other people book.

OneCal vs CalendarBridge — which should I pick?

Both write event copies so the destination calendar shows you as busy. OneCal prices by connected calendars (2 / 5 / 50) and documents Google, Outlook, iCloud, and CalDAV as write targets, plus booking links and a unified calendar view. CalendarBridge prices by sync connections (2 / 20 / 56), writes to Google and Outlook, can use iCloud or ICS URL feeds as sources, and keeps a free Basic fallback. Pick OneCal when you need iCloud or CalDAV as a destination or want booking links in the same product. Pick CalendarBridge when you want connection-based plans or the free Basic fallback.

Does Resync sync Outlook or iCloud?

No. Resync is a Google Calendar app. It does not write holds into Outlook or iCloud. If you need those providers, OneCal documents Google, Outlook, iCloud, and CalDAV; CalendarBridge documents Google and Outlook destinations with optional iCloud or ICS URL sources; Reclaim documents Google and Outlook Calendar Sync; SyncThemCalendars documents Google, Outlook, and Apple iCloud.

Does Resync charge per calendar?

No. The public price is $1.50/month or $9/year after a 30-day free trial, no credit card required. That copy comes from a single monthly amount and a single annual amount. There is no per-calendar tier in that pricing. You can connect more than two Google accounts and mark calendars as sources, mirrors, or both. Resync does not publish a calendar-count cap on the public site.

What if I delete a Busy hold that Resync created?

Resync records that change and does not recreate a hold for the same source event on that mirror calendar.

Clockwise alternatives for calendar sync

How to avoid double booking across Google Calendars

How to sync two Google Calendars from different accounts

Connect the Google calendars you want to keep aligned, then mark sources and mirrors on the dashboard.

Resync will ask Google for permission to:see your list of calendars; see events on the calendars you choose as Sources, to know when you're busy; and create, update and delete events titled "Busy" on calendars you choose as Mirrors. We never store event titles, attendees or locations. Privacy policy