# One Calendar

> One view of all your calendars on Android, Apple and Windows

One Calendar, written OneCalendar on its own site, is a calendar app from the Dutch company Code Spark for Android, iPhone, iPad, Mac and Windows. It connects directly to accounts such as Google, Outlook, Office 365, Exchange, iCloud, Yahoo, Nextcloud and other CalDAV servers and shows them in one overview with day, week, month, year and list views. The app is free, and a one-time Premium license adds search, theming, appointment colors and a longer history.

- **Category:** Calendar & Scheduling
- **Made by:** Code Spark
- **Website:** https://www.onecalendar.nl/
- **Runs on:** Android, iOS, macOS, Windows
- **Facts last checked:** Oct 9, 2026

## Pricing

One Calendar has a free plan. Paid plans start at $5.99 one-time per platform (App Store or Google Play).

- **Pricing model:** Free plan
- **Free plan:** Free version with all five views, appointment management and every supported calendar type, syncing 6 months of past appointments. Search, theming, appointment colors and widget configuration need Premium.
- **Free trial:** None listed.

| Plan | Price | What you get |
| --- | --- | --- |
| Free | $0 | Day, week, month, year and list views across all connected calendars, with invitations and recurrences and 6 months of past appointments. |
| Premium | $5.99 one-time payment per platform group (App Store or Google Play) | Appointment colors, theming, search, 3 years of history, widget configuration, immediate sync and navigation. Windows needs its own license. |

Read from https://apps.apple.com/us/app/one-calendar/id1238379385 on Oct 9, 2026. Prices change, so confirm with One Calendar before buying.

## App Store prices by country

"OneCalendar premium", as each country's App Store showed it on Oct 9, 2026. These are the app's prices, not the website's.

| Country | Price | In US dollars |
| --- | --- | --- |
| United States | $5.99 | |
| United Kingdom | £5.99 | about $7.91 (32% more) |
| Germany | 6,99 € | about $7.82 (31% more) |
| Canada | $7.99 | about $5.60 (6% less) |
| Australia | $9.99 | about $6.94 (16% more) |
| India | ₹ 599 | about $6.19 (about the same) |
| Brazil | R$ 39,90 | about $7.95 (33% more) |
| Mexico | $129.00 | about $7.16 (20% more) |
| Turkey | ₺299,99 | about $6.10 (about the same) |
| Indonesia | Rp 119ribu | about $6.64 (11% more) |
| Philippines | ₱ 399.00 | about $6.33 (6% more) |
| South Africa | R119.99 | about $7.21 (20% more) |

## Key features

- **Many calendar services in one app:** Connects to Google Calendar, Outlook, Office 365, Exchange, iCloud, Yahoo, GMX, Synology, Nextcloud, ownCloud, Mailbox.org and other CalDAV servers, and shows them together.
- **Five views with week numbers:** Day, week, month, year and list or agenda views, all with week numbers. A quick filter narrows what is shown by calendar color.
- **Appointments and invitations:** Add, change and delete appointments, set up recurrences, invite people to a meeting and accept incoming invitations. Appointments can be shared through apps such as WhatsApp.
- **Works offline:** Appointments can be viewed and managed without an internet connection, according to the vendor's feature list.
- **Widgets and live tiles:** Several widgets are available depending on the operating system, including live tiles on Windows. Choosing which calendars, birthdays and tasks a widget shows is a Premium feature.
- **Theming and colors:** Premium unlocks 170 color options, a background picture, a custom text color and predefined themes, plus a separate color for any single appointment. A dark theme is supported.

## Good for

- 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

## 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.

## What people say

- **App Store rating of the iPhone and iPad app:** 4.8 out of 5 from 20,678 ratings in the United States, read Oct 9, 2026. This is the store's rating of the app, not a score from ToolGPA. Source: https://apps.apple.com/us/app/id1238379385

## Works with

Google Calendar, Outlook, Office 365, Exchange, iCloud, Yahoo Calendar, Nextcloud, Synology

**Tags:** Calendar, Works offline, One-time purchase

## Alternatives

- [DigiCal](https://toolgpa.com/tools/digical): Android calendar with seven views, widgets and weather forecasts. [Compare](https://toolgpa.com/compare/digical-vs-one-calendar)
- [Business Calendar 2](https://toolgpa.com/tools/business-calendar-2): Android calendar and task app with widgets and a Pro upgrade. [Compare](https://toolgpa.com/compare/business-calendar-2-vs-one-calendar)
- [CalenGoo](https://toolgpa.com/tools/calengoo): Highly configurable calendar and task app sold as a one-time purchase. [Compare](https://toolgpa.com/compare/calengoo-vs-one-calendar)
- [aCalendar](https://toolgpa.com/tools/acalendar): Android calendar with widgets, tasks and one-time upgrades. [Compare](https://toolgpa.com/compare/acalendar-vs-one-calendar)
- [Google Calendar](https://toolgpa.com/tools/google-calendar): Online calendar from Google, free with a personal account. [Compare](https://toolgpa.com/compare/google-calendar-vs-one-calendar)

## Sources

The prices, plans, platforms and features above were read from these pages on Oct 9, 2026:

- https://www.onecalendar.nl/
- https://www.onecalendar.nl/onecalendar/features
- https://www.onecalendar.nl/support/premiumversionfeatures
- https://www.onecalendar.nl/support/faq
- https://www.onecalendar.nl/support/faq/about_security
- https://www.onecalendar.nl/onecalendar/about
- https://apps.apple.com/us/app/one-calendar/id1238379385
- https://play.google.com/store/apps/details?id=biz.codespark.xcalendarapp&hl=en_US&gl=US
- https://apps.microsoft.com/detail/9wzdncrdr0sf?hl=en-US&gl=US

Page: https://toolgpa.com/tools/one-calendar
Listed by ToolGPA (toolgpa.com).