I am collaborating with friends, to create a schedule of daily visits to another friend who is in need. We tried Doodle, but it doesn't seem to do the job. We then tried creating the schedule in an Open Document (.ods) spreadsheet, hosted on someone's Google Drive, which everyone is opening and viewing ok on their phones, but struggling to edit. If we all had the same apps, e.g. MS 365, it would be easier but it is a faff for everyone to have to install something. Can anyone suggest an online scheduling tool that is free, easy to use, and creates schedules that can be opened/edited by anyone with the link, from any device?