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Office apps for Android?
(lemm.ee)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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Comes down to if you want to be libreoffice compatible or MS Office compatible. We use libreoffice so for us the answer is obvious. I have a family member that uses Colabora all the time and I have it installed. For me frankly I use Joplin and my Email client. No need very often for office anything on mobile.