People often do their 10 minutes of daily fata.dev during their commute where mobile/offline access is ideal. The UX is optimized for mobile but you can also do it on your computer, it's a progressive web app that is installable as a desktop app:
Honestly I think there is no benefit in any mobile coding app at all. It makes coding seem way more tedious than it is. I would rather recommend a book, laptop or youtube video than to do coding tasks on a phone keyboard.