Features & Capabilities

One Calendar aggregates all your calendars—Google, Outlook, iCloud, Exchange, Yahoo, and more—into a single, easy-to-read view. It makes it simple to see all your events at a glance.

This Chrome extension brings cross-platform syncing and management to one place, letting you view and edit appointments, events, and birthdays on all platforms.

User Growth & Download Statistics

By:
Code Spark
Rating:
4.80
(20,413)
21 new ratings
Version:
6.901.0 Last updated: 2025-12-12
Version code:
880179658
Creation date:
2018-05-01
Compatible devices:
Size:
84.60MB
URLs:
Website ,Privacy policy
Full description:
See detailed description
Source:
Apple Apps Store
Data ingested on:
2026-06-07
Compare stats and ranking:

Other platforms

Android
One Calendar (v6.900.1)
1,760,571 4.70 (63,957)

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.
Developed by:
Code Spark
Apple Apps Store
https://apps.apple.com/us/app/one-calendar/id1238379385
Website:
http://www.onecalendar.nl

User Reviews

One Calendar is praised for its clear, clean design and strong cross-device/calendar syncing. Reviewers highlight reliable syncing across Apple devices and with Google/Outlook, plus customization options (themes, colors, views) and high-quality widgets. It’s seen as easy to use, with no mandatory subscription and good family/business support. Common concerns focus on widget reliability and gaps on iOS (reloads after Pro, limited widget controls versus Android), customization limits behind paywalls (color/emoji options, backgrounds), and occasional bugs in the interface (invites tab disappearing, repeating events shifting). Overall, it's highly functional with targeted areas for improvement.
Pros
  • Clear, clean, and user-friendly interface that's easy to navigate.
  • Excellent cross-device syncing across Apple devices and with Google/Outlook.
  • Strong calendar integrations (Outlook, Gmail, Google Calendar, iCalendar) with reliable data across calendars.
  • Rich customization options (themes, personal colors, views) and ability to tailor appearance.
  • High-quality widgets and strong widget support, including detailed views.
Cons
  • Widget reliability on iOS is problematic (reloads after Pro purchase and limited widget controls compared with Android).
  • Customization options are limited by paywalls (color coding, emojis, backgrounds); users want more colors, fonts, and to-do features.
  • Bugs and stability issues (minor interface bugs, invites tab disappearing, and a repeating-event shift bug).
Recent reviews
I have a paid subscription since I really like this calendar. For some reason, the widgets don’t always work. I have tried to delete it restart my phone reloaded it and synced it but it’s still happening. Other than that, it’s a great app.
by NK*****, 2026-05-28

The features I love about this is that we’re able to sync our older calendars, use across our family, etc. etc. Love. What I wish it had was a button for “Today” to take us back quickly (like iCal).
by K *****, 2026-05-18

Great calendar. Very clear. Better than any other calendar I have tried. It is my go to calendar.
by aw*****, 2026-05-07
View all user reviews ›

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