OneCalendar
The facts below are what the maker publishes about OneCalendar, checked and dated. Our editors have not written about it yet.
Plans and prices
From OneCalendar's own pricing page, checked 12 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Basic | Free | Synchronizes up to 6 months of appointment history |
| Premium | — | License required separately for Android, iOS, and Windows; valid on devices using the same platform and store account |
The facts
Each one read from OneCalendar's own pages, with the date it was checked.
Where it runs
- Appointment tools
- Users can add, update, and delete appointments, set recurrences, invite people, accept invitations, and search appointments.checked 12 Oct 2026
- Mobile apps
- ios and androidchecked 21 Sep 2026
- Platforms
- The download page lists Android 6 and higher, iPhone, iPad, Mac, and Windows 10 and 11.checked 12 Oct 2026
What it does
- Calendar services
- It supports Google Calendar, Outlook, Office 365, Exchange, iCloud, CalDAV, Yahoo, GMX, Synology, Nextcloud, ownCloud, and Mailbox.org.checked 12 Oct 2026
- Calendar views
- Available views include day, week, month, year, and list or agenda.checked 12 Oct 2026
- Customization
- Features include calendar and appointment colors, configurable widgets, and theming with 170 color options, background pictures, text colors, and a dark theme.checked 12 Oct 2026
- Offline use
- The app can view and manage appointments without an internet connection.checked 12 Oct 2026
- Premium features
- Premium adds appointment colors, theming, search, configurable widgets, immediate synchronization, navigation, and up to three years of appointment history instead of the usual six months.checked 12 Oct 2026
- Premium limits
- Printing, automatic day rollover, and hiding promotional windows are listed as Windows 10/11-only Premium features.checked 12 Oct 2026
- Privacy
- The privacy policy says appointment and birthday information is not stored on OneCalendar servers and synchronization happens directly between the device and calendar provider.checked 12 Oct 2026
- Purpose
- OneCalendar lets users manage appointments, set up recurring events and meetings, and share appointments.checked 12 Oct 2026
- Security
- For Google and Microsoft accounts, OneCalendar uses OAuth 2.0 over HTTPS and stores received tokens encrypted on the device; its security page also says iCloud passwords and Exchange credentials are stored encrypted on the device.checked 12 Oct 2026
- Support
- The support page provides separate email addresses for Windows, Android, iOS, and macOS users, plus a general support address.checked 12 Oct 2026
Money
- Free plan
- Yeschecked 21 Sep 2026
The company
- Headquarters
- Heemskerk, Netherlandschecked 28 Sep 2026
Alternatives to OneCalendar
- 1
Lark
Free planAndroidiOSWebAPI9.2From $6 a month - 2
EGroupware
Free planOpen sourceAndroidiOSWebAPI9.2From €21.90 a month - 3
Teamup
Free planAndroidiOSWebAPI9.0From $12 a month - 4
Twake Calendar
Open sourceAndroidiOSWebAPI9.0From €4 a month - 5
TimeFinder
Free planAndroidiOSWebmacOS8.9$119.99 one-time - 6
7shifts
Free planAndroidiOSWebAPI8.9From $39.99 a month