Video tutorials
Step-by-step tutorials for Google Calendar and Google Tasks, each with its video: fixes for common problems, and how to get more done with each GCal Tools app.
Google Calendar fixes
Calendars Missing in the Google Calendar App on Android? Turn On SyncOnly "My calendar" shows in the Google Calendar app on your Android phone, but your other calendars are there on the computer? Switch on Sync for each missing calendar in the app's settings.
Calendar Widget Not Showing Google Calendar Events? 3 FixesYour Android calendar widget, or another calendar app, shows none of your Google Calendar events? Share Google Calendar's data with other apps, resync your account, and if that fails, switch the calendar's sync on with adb.
GCalToolkit
Delete Duplicate Events in Google Calendar with GCalToolkitSyncing Google Calendar with other software can duplicate your events by the hundred. GCalToolkit finds the duplicates as soon as a calendar loads, and deletes them all in one go.
Change the Time Zone of Many Google Calendar Events at OnceImported events sometimes have the wrong time zone, even though they show at the right time in Google Calendar. GCalToolkit changes the time zone of many events at once, without moving them.
Copy Repeating Events in Google Calendar Without Losing Deleted OccurrencesGoogle Calendar's Copy brings back any occurrence you deleted from a repeating event. GCalToolkit copies the series exactly as it is, and can shift the copy by a week or repeat it several times.
Sheets2GCal
GTasksToolkit
Get Started with GTasksToolkit for Google TasksConnect GTasksToolkit to Google Tasks, see every task list in one editable table, unlock the full version and restore a deleted task, on Windows, Mac or Linux.
Create, Edit, Delete and Restore Google Tasks on Your DesktopManage Google Tasks in one table with GTasksToolkit on Windows, Mac or Linux. Create tasks and lists, edit and delete tasks, and restore a deleted one, then save everything to Google at once.