
Al Quran (Tafsir & by Word) is a Quran app built for study rather than recitation alone, from a non-profit foundation, and it carries no advertising and no paid tier.
Its defining feature is word-by-word translation. Tap any Arabic word and you get its meaning and root, which lets a reader with no Arabic follow the structure of a verse rather than only its overall sense. Over time this is how many readers begin to recognise vocabulary directly.
Tafsir — scholarly commentary explaining the context and meaning of verses — is included from several classical and modern sources, attached to the verses they discuss rather than kept in a separate book.
Beyond that: multiple translations in a wide range of languages, several reciters with verse repeat, bookmarks, notes, a night reading mode, and full offline operation once content is downloaded.
Free on Android and iOS with no advertising, funded as a non-profit project — which is unusual enough in this category to be worth stating plainly.
Greentech Apps Foundation is a non-profit that develops Quran and Islamic study applications and distributes them free of charge and without advertising.