Where can I read the original webcomic One Punch Man created by ONE, preferably offline in an iOS app or in printed form.
Welcome to Anime & Manga! Take note that this site doesn't condone piracy, so we will only mention legal/official sites if they exist. Answers/comments that mention questionable sites will be removed without prompt.– Aki Tanaka ♦Dec 16, 2020 at 20:10
That said, are you looking for the English translation or the original Japanese?– Aki Tanaka ♦Dec 16, 2020 at 20:10
I’d prefer Japanese but if it exist in English I’d like that also. I am also only interested in legal sources and it is OK if it costs money.– bitbonkDec 16, 2020 at 20:18
The web-comic of One Punch Man is a self-published work by ONE, and are freely available, in Japanese, on their website
As far as I know there are no printed or digital versions available for purchase. Hence for offline reading I would suggest a app/browser that supports offline reading.
Well, since you're apparently limited to iOS, and PC, I advise downloading all of the webcomic to your computer and reading it at your own pace.