One Calendar reviews
One Calendar's iPhone and iPad app averages 4.8 out of 5 from 20,678 ratings on the App Store in the United States, as read on Oct 9, 2026.
The rating
4.8
out of 5 for the iPhone and iPad app
20,678 ratings on the App Store in the United States, read Oct 9, 2026. It rates the app, not everything the product does. See the listing
We have not yet read enough reviews of One Calendar to say what people praise and criticise. The links below go to where the reviews are.
Check for yourself
- App Store listingEvery rating and review, at the source
- G2Reviews from people who use it at work
- RedditThreads where people discuss it
- Hacker NewsDiscussions among developers
These open each site’s own pages. Nothing on this page is copied from G2 or Reddit.
What One Calendar's own pages show
Suits
- People who mix Google, Microsoft, iCloud and CalDAV calendars
- Households or workers split between Android, iPhone and Windows
- Buyers who want a one-time payment and no subscription
Limits worth knowing
- A Premium license is needed per platform group: Android, iOS and Windows are each bought separately, because the stores do not allow cross-platform licensing.
- The free version syncs 6 months of past appointments and leaves out search, theming and appointment colors.
- The Microsoft Store page lists the Windows app as free with in-app purchases but does not show the Premium price.
- No web or Linux version is listed. Printing and automatic day rollover are Windows-only Premium features.
Read from the vendor’s pages, not from reviews. The tool page lists them.
Common questions
How is One Calendar rated?
One Calendar's iPhone and iPad app averages 4.8 out of 5 from 20,678 ratings on the App Store in the United States, as read on Oct 9, 2026. That is the store's rating of the app, not a score from ToolGPA.
Are these ToolGPA's own reviews of One Calendar?
No. ToolGPA does not review or score tools. Any rating shown is the store's, and any praise or complaint listed is a theme from public reviews and discussions, summarised in our words with a link to where it was said.
Where can I read more reviews of One Calendar?
This page links to One Calendar's App Store listing where it has one, and to searches for it on G2, Reddit and Hacker News, so you can read what people wrote in full.