One Calendar is unclaimed —

One Calendar

Get organised! Always have a clear overview of all your appointments everywhere you go.·onecalendar.nl

One Calendar is a calendar management app that lets users view and manage appointments across multiple calendar accounts in one place. It supports scheduling, recurring events, meeting invitations, and sharing appointments via other apps. It syncs with numerous calendar services and works offline.

What it's for

Manage appointments across multiple calendar accountsSetup meetings and recurring eventsInvite people to meetings and accept invitationsShare appointments via apps like WhatsAppView calendars offlineFilter appointments by colorSearch appointments

Features 16

Add, update, and delete appointments
Configurable widgets (Live tiles on Windows)
Customizable colors per calendar and appointment
Dark mode
Invite people and accept incoming invitations
Manage all online calendars (Google, Outlook, Office 365, Exchange, iCloud, CalDAV, Yahoo, GMX, Synology, Nextcloud, ownCloud, Mailbox.org)
Multiple views: Day, Week, Month, Year, List/Agenda
Personalized theming
Quick filtering by color
Search all appointments
Setup recurrences
Share appointments via other apps (e.g. WhatsApp)
Support for multiple UI languages
Theming with 170 color options and background pictures
Week numbers shown in all views
Work offline

At a glance

free tier

TypeMobile app

DeploymentInstalled (local)

PlatformsAndroid, iOS, macOS, Windows

LanguagesEnglish, German, French, Italian, Spanish, Catalan, Dutch, Portuguese, Chinese, Japanese, Korean, Hindi

CompanyCode Spark

Integrations

OutlookGMXNextcloudGoogle calendarWhatsAppOffice 365ownCloudiCloudCalDAVMailbox.orgYahooSynologyExchange

Pricing

FreeFree

App is downloadable for free; a customer review notes it has no ads.