Calensync vs OneCal: Which Calendar Sync Tool Fits You? (2026)
Updated October 2026
Calensync and OneCal both keep your Google, Outlook and Apple calendars in sync, so you stop double-booking yourself. They differ mostly in how they charge and in how much control they give you. This page is updated for 2026. If you are already leaning towards switching, read our step-by-step OneCal alternative guide.
At a glance
| Calensync | OneCal | |
|---|---|---|
| Price (yearly) | $35/yr, unlimited calendars | $60 to $300/yr per user, 2 to 50 calendars |
| Providers | Google, Outlook, Apple (iCloud), .ics (read-only) | Google, Outlook, iCloud, CalDAV |
| Filters | Regex, status, response, free events | Colour or category, RSVP, free events |
| Apps | Web | iOS, Android, macOS |
| Security attestations | Open source, stores no event details | SOC 2 Type II |
| Trial | 7 days, no card | 14 days, no card |
Pricing: a flat fee against per-user tiers
OneCal charges per user and limits calendars by plan: 2 on Starter, 5 on Essential and 50 on Premium. Calensync is $4 a month or $35 a year with no limit on accounts, calendars or sync rules.
| Setup (synced both ways) | Calensync | OneCal |
|---|---|---|
| 2 calendars | $35/yr | $60/yr |
| 3 to 5 calendars | $35/yr | $120/yr |
| 6 calendars | $35/yr | $300/yr |
The more calendars you add, the wider the gap gets. Prices checked on 23 October 2026 on OneCal's pricing page; billed yearly, in USD, before tax.
Event controls: where Calensync goes further
Both tools let you colour synced events and decide how much detail to copy. Calensync adds more per-rule controls:
- Title control: replace the title with any text, or just "Busy", or add a prefix
- Regex filters: include or exclude events by title or description, not only by colour or category
- Status-based syncing: skip tentative or declined events, or convert tentative events to busy
- Visibility and location: set copied events to private, and choose whether to include the location
- Buffer time: add a margin around synced events
Integrations: both cover the big three
This used to be OneCal's strongest point. Today Calensync also syncs Google, Outlook and Apple (iCloud) calendars in both directions, plus .ics feeds as a read-only source. OneCal still offers CalDAV accounts, which Calensync doesn't. For iCloud, OneCal checks for changes about every 10 minutes; Calensync's speed depends on the provider and ranges from seconds to a few minutes.
Privacy and open source
Calensync is open source and doesn't store event titles, descriptions or other event details. Both tools can copy a personal event into a work calendar as a plain "Busy" block. OneCal's docs say new syncs block only the time slot by default; in Calensync you choose "Busy" or any text you like per rule. Read our privacy policy for details.
Where OneCal is the better choice
- Native iOS, Android and macOS apps
- SOC 2 Type II, SSO (OIDC/SAML), SCIM and audit logs for company security reviews
- Unlimited booking links on every plan, plus Zoom, Google Meet and Zapier integrations
- A longer trial: 14 days instead of 7
Conclusion: the choice is yours
Pick Calensync if you want unlimited calendars at a flat $35 a year, regex filters and fine control over what gets copied. Pick OneCal if you need native apps, formal security attestations or team administration. Both do calendar sync well; the difference is price structure and depth of control.
.. and get 7 days free trial
Other comparisons: