Does Kiwix actually work? I see people hyping it here but I could never get it to actually, y'know, download the file and display the wikipedia on my phone.
Kiwix worked for me. IIRC there may be difficulties opening an archive that was downloaded outside of the mobile app, but archives downloaded in-app were fine.
For the mobile app I used one of the smaller Wikipedia subsets, since I didn't want to take up too much space on my phone. The full offline Wikipedia download is saved to my laptop.
