Viber

Viber is a messaging and calling app offering free voice and video calls, group chats and calls, stickers and GIFs, and synced conversations across mobile and desktop devices, including one-tap transfer of an ongoing call between devices. Communities on Viber let members take part in conversations on topics they are passionate about, described by the app as bringing people together around shared interests. The app is published by Viber Media S.à r.l., part of the Rakuten group of services, with apps available for Android, iPhone, Windows, Mac and Linux.

Its ads.txt file lists 247 ad system lines, 36 direct and 239 reseller, across app placements.