There are many alternatives to Google Calendar as a web app if you are looking for a replacement. The best Online alternative is Nextcloud Calendar, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Google Calendar and many of them are available as a web app so hopefully you can find a suitable replacement. Other interesting Online alternatives to Google Calendar are fruux (Freemium), Calendly (Freemium), ProtonCalendar (Freemium) and Woelkli (Freemium, Open Source).
TimeTree is a calendar app designed around the concept of shared schedules and communication. [TimeTree Features] - Sharing calendars with your group is surprisingly simple. - No complicated registration process. To share a calendar, simply send its URL link.
Cozi is a free online calendar that helps families coordinate activities. See who needs to be where and when, be reminded of upcoming appointments, and print your calendar by week or month. Cozi is the easiest online calendar you'll ever use.
Unlike other calendar programs, Teamup does not require any user account. No signup, no login. Access to Teamup Calendar is as simple as opening a calendar link in your web browser. The calendar links can be shared with as many users as needed.