Errands app (gtk) has caldav support for tasks.
Linux
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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https://super-productivity.com/
It’s all Electron though, so the Android widget sucks (won’t update way too often). But otherwise should be a perfect fit for you.
Android has no Electron?
It just means it isn’t built using technologies native to Android, but it will run on every Android phone. I can’t speak of the performance of the newest releases, I use an iPhone now. YMMV.
I use Vikunja, but you have to self host it, it's not an app you can just start on your PC