A webtoon is a digital comic published online in vertical, episodic form and read by scrolling down a phone screen. Adult webtoons split on one line: whether the series stops short of explicit sex or goes past it. WEBTOON allows mature series and bans explicit sex everywhere, so the explicit ones live on other services.
NSFW webtoons are the explicit side. Honeytoon, Toomics, TOPTOON Plus, Tapas, Lezhin, Tappytoon and Manta sell them, and each keeps them on its website and out of its App Store and Google Play builds. Lezhin adds an Android APK it hosts on its own site.
Most erotic webtoons are romance, BL and GL series with an 18+ edition. Tappytoon, Lalatoon, Manta and Lezhin each have a Romance shelf and their own label for the steamier version. Tappytoon uses [Steamy] for partly censored and [Uncut] for unabridged.
Manhwa is the Korean word for comics, and most of it now reaches English readers as webtoons. The adult ones carry a 19+ label at home.
An episode costs roughly $0.24 to $0.50 in coins on the sites that sell that way. Toomics and TOPTOON Plus sell a VIP plan instead, and Manta and Tappytoon sell a membership.
To compare services, start with the best adult webtoon platforms. Anyone who wants to know what an episode contains before paying should read the NSFW webtoon sites list. Readers weighing the format against Japanese books can check webtoons against manga.