AdGuard works pretty well on iOS. I don’t think there is a way to do a ‘dark reader’ specifically though perhaps pages honour the OS’s ‘dark mode’ setting these days? I would guess support is spotty.
Sites that use the prefers-color-scheme media query honor the OS setting on iOS, but it obviously doesn't work on sites that haven't implemented it - Dark reader[0] takes a invert-colors approach and makes it a little easier on the eyes.
well adguard only have ip, domain names etc. I mean it has less context? Addon has more context about the webpage lets say it can remove ads belonging to DOM with id #ads-1 ?
And in Europe, cookies / nag-popup-removers for all those GDPR compliance dialogs (though vanilla Firefox is becoming better in blocking trackers by default).
#2 is dark reader.