TheCalendarWeek is described as 'A lightning-fast utility to calculate ISO 8601 calendar weeks, reverse-lookup dates, and generate embeddable website widgets' and is a Calendar app in the office & productivity category. There are more than 10 alternatives to TheCalendarWeek, not only websites but also apps for a variety of platforms, including Android, iPhone, iPad and Mac apps. The best TheCalendarWeek alternative is Google Calendar. It's not free, so if you're looking for a free alternative, you could try Google Calendar or Proton Calendar. Other great sites and apps similar to TheCalendarWeek are Notion Calendar, Apple Calendar, Itsycal and Outlook Calendar.
Manage events seamlessly with syncing across devices, automatic event creation from Gmail, shareable schedules, customizable reminders, and a user-friendly interface. Features include dark mode, integration with Google services, and support for recurring events and global time zones.
United States
Switzerland
Tuta Calendar offers secure event organization with end-to-end encryption and no ads or tracking. Enjoy multi-device sync, multiple calendar views, and offline access. Fully compliant with strict German data protection laws. Manage recurring events, unlimited calendars, and seamlessly integrate with Tuta Mail.
Germany
EU
Experience a fully integrated calendar with Notion, syncing events from Google Calendar, offering built-in scheduling, time zone support, and the ability to connect multiple accounts. Manage all events, personal and work, with a modern design, light and dark modes, and Lock Screen support for iOS 17.
United States
Keep track of your busy schedule and share it with others using Calendar. Create separate calendars — one for home, another for school, a third for work, and so on. See all your calendars in a single window or choose to see only the calendars you want.
United States
Itsycal is a tiny menu bar calendar. If you want, it will display your events as a companion to the Mac Calendar app.
United States
Web-based time-management tool featuring appointment scheduling, sharing, reminders, to-do list integration, iCalendar file import, collaborative options, multiple calendar creation, recurring events, and cross-device access for both personal and organizational use.
United States
Android calendar-app showing the weeks of the year (week numbers), 21 languages, syncable with Google Calendar:
GermanyEU
Free online widget enables display of up to six customizable clocks per page, supporting both analog and digital formats. Features real-time time zone updates, automatic DST adjustments, easy HTML integration, and compatibility with mobile or desktop websites.
Norway
T-Clock Redux in an enhanced fork of Stoic Joker's T-Clock 2010 with ISO week number support, bug fixes and the ability to use Windows default calendar and ToolTip.
GermanyEU
The only fully-functional open-source calendar app with Material You.
United States
Norway
