One Calendar

6.901.0

Code Spark

4.69

60,416 reviews

1,000,000+
Downloads

Free

Manage all your calendars in ONE place!

About One Calendar

One Calendar is a productivity app developed by Code Spark.

Download Statistics

One Calendar has been downloaded 1.8 million times. In the last 30 days, the app was downloaded 10 thousand times.

User Ratings

One Calendar is rated 4.69 out of 5 stars. The rating is based on 60 thousand ratings.

App Information

One Calendar is FREE to download. The APK download size is 68.45 MB. The latest version available is 6.901.0. The last update was on November 22, 2025.

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 April 2018.

Description

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.

More data about One Calendar

Price	Free to download
Total downloads	1.8 million
Recent downloads	10 thousand
Rating	4.69 based on 60 thousand ratings
Ranking	Not ranked
Version	6.901.0
APK size	68.4 MB
Number of libraries	39
Designed for Android	6.0+
Suitable for	Everyone
Ads	NO ads

App Performance Report

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Alternative downloads for the One Calendar app

One Calendar compared with similar apps

Common keywords of similar apps

Onecalendar Calendars Manage View

Keywords missing from this app

Calendar Events App Event Day Google Features Appointments Tasks Schedule Planner Year Agenda Week Add Month Sync Reminders Business Support Widgets Overview Exchange Caldav Free Create Views Widget Settings Multiple Supports Options Device Family Easy Version Outlook Time Professional Set Http Personal Scheduling Stay Meetings Easily Move

Google Play Rating history and histogram

Downloads over time

One Calendar has been downloaded 1.8 million times. Over the past 30 days, it averaged 340 downloads per day.

Changelog of One Calendar

Show changelog

Developer information for Code Spark

Code Spark

support.android@onecalendar.nl

Website

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Comments on One Calendar for Android

★★★★★ Kim W · Apr 11, 2026

One Calendar, hosted on my Android, providing perfect 3-way sync to girlfriends iPhone and Vivaldi calendar on my laptop. Brilliant. I was starting to think it wasn't possible.

★★★★★ Dibbles · May 7, 2026

Consistently good, reliable. Recommend. Perfect for multiple shared calendars and work and personal. Better than Outlook and syncs perfectly with Outlook too.

★★★★★ Randall E Bryant · Apr 9, 2026

The perfect app for viewing. And modifying your iCloud calendar on your Android devices.

★☆☆☆☆ Bryan Chu · Apr 4, 2026

Useless doesn't support Cal DAV properly noob app. Lol noob support here in review too says email them. Umm no, I changed to another app that works, not going to email you lol

★★☆☆☆ Brandi White · May 9, 2026

Works really well on phone but will not work on Cozyla. I reached out to customer service and have not gotten anything back. Now I need to find a calendar that will sync with my Outlook calendar

★☆☆☆☆ Erin Morash · May 27, 2026

App on Android mobile UI does not connect Google or Microsoft accounts. After having trouble syncing the app on my Android device with the appointments recorded on the app on my laptop, could not reload any of my mobile accounts. I have a paid premium account, and I cannot reload my Google, microsoft calendars to my Android mobile device. There used to be a simple email contact form for malfunctions, but that's gone now too.

★☆☆☆☆ B P · Jun 16, 2026

Please stop with the annoying feedback reminders. I would have given it 5 stars, but this is for those reminders.

Google Play Rankings for One Calendar

This app is not ranked

Technologies used by One Calendar

One Calendar is requesting 13 permissions and is using 39 libraries.

Permissions

Network communication

view network connections, full network access, Google Play billing service, receive data from Internet

Hardware controls

control vibration

System tools

run at startup, prevent phone from sleeping

Extra

android.permission.POST_NOTIFICATIONS, android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS, android.permission.SCHEDULE_EXACT_ALARM, android.permission.USE_EXACT_ALARM, biz.codespark.onetask.permission.READ_EVENT_STORE, biz.codespark.xcalendarapp.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Ad network libraries

None found

Social libraries

None found

Development tools

Android Jetpack core

Android Architecture Components

Android Jetpack VersionedParcelable Android Jetpack Annotations Android Library Icon

Android Jetpack Annotations Firebase Android Library Icon

Firebase

Android Jetpack Widgets Android Jetpack AppCompat Android Library Icon

Android Jetpack AppCompat AndroidX Activity Android Library Icon

AndroidX Activity Android Activity Saved State Android Library Icon

Android Activity Saved State AndroidX Loader Android Library Icon

AndroidX Loader Android Jetpack Media Android Library Icon

Android Jetpack Media Google Cloud Messaging (GCM) Android Library Icon

Google Cloud Messaging (GCM)

Android Transition Support Library

Android Support Library collections Kotlin Android Library Icon

Kotlin

Android Support VectorDrawable

AndroidX Legacy: Support Library core utils AndroidX Cursor Adapter Android Library Icon

AndroidX Cursor Adapter

AndroidX Local Broadcast Manager

Android Support Library Print AndroidX App Startup Android Library Icon

AndroidX App Startup Google gson Android Library Icon

Google gson

Android Support Library Document File

AndroidX Legacy: Support Library core UI AndroidX Widget ViewPager2 Android Library Icon

AndroidX Widget ViewPager2

Android Support Library Async Layout Inflater Okio Android Library Icon

Okio

AndroidX Concurrent Futures JetBrains Annotations Android Library Icon

JetBrains Annotations IntelliJ IDEA Android Library Icon

IntelliJ IDEA AndroidX Tracing Android Library Icon

AndroidX Tracing AndroidX ProfileInstaller Android Library Icon

AndroidX ProfileInstaller AndroidX DynamicAnimation Android Library Icon

AndroidX DynamicAnimation AndroidX Preference Android Library Icon

AndroidX Preference Dagger Android Library Icon

Dagger

AndroidX Security (Crypto) Visual Studio App Center Android Library Icon

Visual Studio App Center AndroidX GridLayout Android Library Icon

AndroidX GridLayout Xamarin Android Library Icon

Xamarin

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