When comparing GTasks vs TagSpaces, the Slant community recommends TagSpaces for most people. In the question“What are the best offline to-do list apps for Windows?” TagSpaces is ranked 16th while GTasks is ranked 26th. The most important reason people chose TagSpaces is:
TagSpaces is free and open source making it easily extendable with the help of extensions.
Specs
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Pros
Pro Unlimited subtasks
Unlimited subtasks or sub sub tasks, as deep as you need, excellent for project work.
Pro Synchronizes with Google tasks available natively in GMail
Seamlessly syncs tasks.
Pro dark theme available
Pro time reminder is supported
Pro Closing parent task closes sub tasks
Pro Available on iOS
Pro Works with Chrome's 'Google Tasks Panel' extension
Pro Open source
TagSpaces is free and open source making it easily extendable with the help of extensions.
Pro Your can choose your cloud file storage
Using only files and no databases let's you make the decision with which cloud file sync service to use, making sure your notes are made available on other devices and platforms. It works great with Owncloud, Nextcloud, Dropbox or Google Drive.
Pro No web service or database lock in
The backend is simply the directory and file structure on your harddrive.
Pro No cloud
TagSpaces is running completely offline, sending no data to any cloud based service, unlike many Evernote alternatives.
Cons
Con Pop up ads get in the way
The app frequently displays popup ads when you navigate the app, forcing you to pause to close them.
Con No recurring tasks fom completion
Con Does not support attachments
You cannot add attachments to tasks.
Con It renames your files in order to tag them
The positive side of this drawback is that this way the tags are easily transferred to other platforms by simply syncing them.