Comparison · Office and email
Calendar sync tools compared: price, calendars supported, two-way, busy-only, and free tier
By Blink Brief · Published · Updated · How pages are made
Two-way, busy-only sync between Google, Outlook, and iCloud costs nothing for 2 calendars on SYNCDATE's free plan. Paid plans start at $2.99 a month (Calendar FreeSync Pro). Every price and limit below comes from the vendor's own pricing page, read on 1 November 2026.
Short answer
- Free, 2 calendars: SYNCDATE Free (Google, Outlook, iCloud; 1 two-way sync; 30 days ahead) or Reclaim Lite (Google and Outlook only; 1 sync).
- Under $5 a month: Calendar FreeSync Pro $2.99/month, CalendarPipe Pro $4/month, CalendarBridge Basic $4/month billed yearly (2 calendars), SyncMyDay €40 a year.
- Busy-only is the default on SYNCDATE and the only mode on SyncMyDay. On the others you switch it on.
On this page
Quick picks
-
Free, 2 calendars
SYNCDATE
One two-way sync between 2 calendars on Google, Outlook, or iCloud, copied as Busy by default, 30 days ahead.
Free
syncdate.app -
Unlimited accounts
CalendarPipe
Pro syncs unlimited accounts and rules every 5 minutes; mirroring both ways takes two rules.
$4/month
calendarpipe.com -
Exchange, Kerio, or Zimbra
SyncMyDay
Syncs Google, Microsoft 365, and iCloud with each other and with Exchange, Kerio, or Zimbra company servers, copying only Busy.
€40 a year
syncmyday.eu
Price and free tier
| Tool | Price | Free plan or trial |
|---|---|---|
| OneCal | Per user per month, billed annually: Starter $5 ($60/year, 2 calendars), Essential $10 ($120, 5 calendars), Premium $25 ($300, 50 calendars). Billed monthly: $6, $12, $30 (from the page's structured data) | No free plan. "All plans include a 14 days free trial, no credit card required" |
| CalendarBridge | Billed yearly: Basic $4/mo (2 calendars), Premium $8/mo (5), Pro $32/mo (8). Billed monthly: $5, $10, $40 | No free plan. 7-day free trial, no credit card |
| SyncGene | Premium price not published. The page says "New subscriptions now start on CiraHub", "Starting $8 per month (billed yearly)" | Free account: "Manual Sync for Free account is limited to 1 synchronization per month"; the FAQ limits it to two accounts |
| Reclaim | Per seat per month, yearly / monthly: Starter $10 / $12 (3 calendar syncs), Business $15 / $18 (unlimited), Enterprise $22, yearly only | Lite, "Free forever": 1 calendar sync |
| SYNCDATE | Plus $119.99 a year ($10/mo billed yearly, 5 accounts). Pro $219.99 a year ($18.33/mo, 20 accounts). Team: 5 seats $995 a year. "Prices include tax." | Free: "Connect 2 accounts and 2 calendars", "Create 1 sync", "Sync 30 days ahead". "No card required. No time limit." |
| SyncMyDay | One plan: €5 / month, or €40 billed once a year. Unlimited calendars | No free plan. "Try 14 days free", no credit card |
| CalendarPipe | Pro "$4/month or $40/year", unlimited accounts and rules. Business: contact for pricing | Free forever: 2 connected accounts, 1 sync rule, 14-day sync window. Pro: 14-day trial, card required |
| Calendar FreeSync | Pro $2.99/month, up to 10 connected accounts. No annual price published | Free: 1 one-way sync, 2 connected accounts. Pro: 7-day free trial |
Prices checked on 1 November 2026 on each vendor's own pricing page, linked in the first column; SyncMyDay, SyncGene and SyncGene's FAQ read again on 4 November 2026. USD unless marked €.
Calendars supported, two-way, busy-only, and sync speed
| Tool | Calendars | Two-way | Busy-only copies | Speed (vendor's words) |
|---|---|---|---|---|
| OneCal | Google, Outlook, iCloud, CalDAV | Yes | Hide titles and "show a custom message" | "real-time"; "iCloud Calendar updates take up to 10 minutes" |
| CalendarBridge | Google, Microsoft 365 business plans, Outlook.com, iCloud, ICS links, CalDAV. Microsoft 365 personal and family plans "cannot be supported" | Yes | "Sync all details, just “busy,” or somewhere in between." | Google and Microsoft "within a minute or two"; iCloud and ICS "every 5 to 10 minutes" |
| SyncGene | Google, iCloud, Microsoft Exchange, Office 365, Outlook.com | Yes | No busy-only option on its pages | "Instant synchronization" |
| Reclaim | Google and Outlook. iCloud isn't mentioned | Yes | "Busy — Generic busy time, no details" | "in real time" |
| SYNCDATE | Google, Outlook, iCloud, CalDAV (Fastmail, Nextcloud); iCal feeds read-only | Yes, on every plan (2 calendars per two-way sync on Free) | Default: "New syncs copy events as Busy" | Google and Outlook "under a minute"; iCloud and CalDAV "about every 15 minutes" |
| SyncMyDay | Google, Microsoft 365/Outlook, iCloud, Exchange, and Kerio and Zimbra company servers; email invitations for a locked-down Exchange | Yes | The only mode: "The blocker is simply called “Busy”" | "The blocker appears within minutes" |
| CalendarPipe | Google, Outlook (Office 365, Outlook.com), Apple Calendar, ICS feeds | Pro only: "mirroring both ways is two rules", and Free has 1 rule | Yes, as a rule: "show them all as Busy" | "Every 15 minutes on Free, every 5 minutes on Pro." |
| Calendar FreeSync | Google, Outlook (Outlook.com, Microsoft 365), iCloud | Pro only ("Multi-Way Sync"); Free is one-way | Pro only: "Private sync (events appear as "Busy")" | No figure; it "does not promise instant or real-time updates for every calendar." |
Read on each vendor's own pricing and feature pages on 1 November 2026; SyncMyDay read again on 4 November 2026.
Where the vendors' own pages disagree
- Reclaim: the Starter card says 3 calendar syncs; the comparison table on the same page says unlimited.
- CalendarBridge: the yearly cards limit calendars to 2, 5, and 8; the monthly cards say "Add Unlimited Calendars". The signup page gives a 7-day trial; a help post from August 2026 says 14 days.
- SyncGene: the pricing page gives new free accounts a 7-day trial with automatic sync; the FAQ says automatic sync is off on free accounts.
Ask the vendor before you buy if one of these limits decides it for you.
No tool at all: what Google and Outlook do on their own
Free/busy sharing and published calendars show your busy times in another calendar without a paid tool, one direction at a time. Subscribed calendars refresh on the provider's schedule, not when you change an event. The step-by-step guide covers each built-in option and exactly what it shows.
For a one-off copy, the free Busy Calendar tool turns an .ics file into a version with only Busy blocks, which you import into the other calendar.
Our product · in development
Blink Calendar Sync copies every event as Busy between Google, Outlook, and iCloud, both ways and automatically. Planned price: $8/month. It isn't available yet; join the early list to get an email when it opens.
Join the early list