One Calendar

by Code Spark · Productivity · Free

On Google Play since April 2018 · Data updated 2026-10-16

Google Play

One Calendar is made and published by Code Spark. AppBrain is an independent app data site and isn't affiliated with Code Spark. The app name, icon, screenshots and description belong to Code Spark and are shown as published on Google Play.

AppBrain's verdict

EstablishedPopularLoved by users

Total installs: 1.8 million
Rating on Google Play: 4.68; 61,113 ratings
Last updated: August 15, 2026

One Calendar is popular, with 1.8 million installs. Users love it: 4.7 stars from 61,113 ratings.

Installs

Tracked by AppBrain

Last 30 days: 11 thousand
Per day: 380; 30-day average
Play install range: 1+ million
Launched: April 2018

Installs over time

One Calendar has been installed 1.8 million times. Over the past 30 days, it averaged 380 installs per day.

Rankings

Google Play top charts

Google Play Rankings for One Calendar

This app is not ranked

Competitors

Similar apps and more from Code Spark

Alternatives to One Calendar

Releases

Updates seen on Google Play

Version: 10.100.2
Launched: April 2018

Aug 15, 2026UpdateVersion 10.100.2
Aug 11, 2026UpdateVersion 10.0.102
Jun 27, 2026UpdateVersion 6.910.3
Nov 22, 2025UpdateVersion 6.901.0
Oct 21, 2025UpdateVersion 6.900.1

Show all changes Show fewer

User feedback

Ratings and reviews on Google Play

Google Play Rating history and histogram

51K

6.3K

1.7K

410

2.1K

Comments on One Calendar for Android

★★★★☆ Christopher Laidlaw · Aug 16, 2026

Provides what Google Calendar is missing. I need to keep an iCloud calendar (living in a household with iPhone family members). They don't want to use Google, and I've both Google and iCloud calendars to maintain and share. Google calendar app doesn't support non-Google accounts. This app supports any calendars. I would make it better with an updated design which aligns more with the Google UI design principles. It looks cluggy & 3rd party but it works.

★★★★★ Furman Evans · Sep 28, 2026

Integrates with the Outlook calendar and with my wife's Outlook calendar. Easy to use.

★★★★★ Nicholas Colwell · Oct 1, 2026

The best calendar app ever, perfect sync between phone tablet pc (samsung, xiaomi, windows) quick drag and drop appointments, and the occasion version is just incredible. Easy 5/5 stars

★☆☆☆☆ Old Mechanic · Sep 9, 2026

Someone has hacked this app and adds an "auto-pay" notice scheduled today or tomorrow supposedly to buy a gift card for a random merchant that will allegedly be charged to your PayPal account complete with the "hook" phone number for you to call if you believe there's an error. ...and get one every couple days.

★☆☆☆☆ Alard · Oct 9, 2026

Stopped working with Calder Zoho calendar out of nowhere. Useless to me now.

★☆☆☆☆ Tom Insley · Aug 27, 2026

Deleted the app. Didn't sync with the calendar in my Outlook for Android - in other words, useless.

Technology

Found in the app by AppBrain

Ads: No ads
Price: Free
Libraries: 39
App size: 74.2 MB
Needs Android: 6.0+
Content rating: Everyone

Technologies used by One Calendar

13 permissions · 39 libraries

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About the app and developer

About One Calendar

One Calendar is a productivity app developed by Code Spark.

Install Statistics

One Calendar has been installed 1.8 million times. In the last 30 days, the app was installed 11 thousand times.

User Ratings

One Calendar is rated 4.68 out of 5 stars. The rating is based on 61 thousand ratings.

App Information

One Calendar is freely available from Google Play. The app size is 74.17 MB. The latest version available is 10.100.2. The last update was on August 15, 2026.

Technical Requirements

One Calendar requires Android 6.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play since April 2018.

App Performance Report

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Developer information for Code Spark

Code Spark

support.android@onecalendar.nl

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Store listing

By Code Spark, from Google Play

“Manage all your calendars in ONE place!”

Screenshots by Code Spark, from the Google Play listing

Description by Code Spark Written by the developer, not by AppBrain. Click to read.

The most popular app to view all your calendars like Google, Live, Outlook, iCloud, Exchange, Office365, Yahoo, Nextcloud, Synology, GMX, Mailbox.org, ownCloud and more. OneCalendar integrates all your calendars into an easy-to-read overview. View and manage all your appointments, events and birthdays.

OneCalendar is available on all platforms (Android, iOS, MacOS and Windows).

Recent changes:
Upgrade edge to edge design

Official page on Google Play

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