I found this free writing tool via the Reedsy Blog a couple of weeks ago and did a video on it. Alternatively, there's a free app on Steam that has some of the same functionalities, also referenced in the video.Sometimes I wish that I didn't have video games or Internet so I could actually focus on writing my book. I keep getting distracted. I try to find time at night to work on my book, but I feel like that's not enough.
FrostWriter allows you to type on a mostly featureless canvas while listening to theme music (whichever theme you're writing in). You'd have to copy/paste your work to another app when your writing session is over since there are no formatting tools in the program, but that's also by design since it limits your ability to go back and "fix things." Essentially its job is to make sure you write something, which is probably useful for a lot of us.
Alternatively, Virtual Cottage is a study tool that helps you focus while you do other things.
Maybe one or both of them will help.
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P.S. The FrostWriter app's creator recently quoted a snippet of my companion article on his site. It's in the "Stories" category if you all visit the site. All the relevant links are in the YouTube description.