Wire

Crystal clear voice, video and group chats. No advertising. Always encrypted. Always available on phone, tablet, desktop and web. - Everything on Wire is private and always end-to-end encrypted. - Fast and secure messenger with pics, sketches, GIFs, YouTube, Spotify, and SoundCloud. - Voice and video calls offer best-in-class quality. - Wire offers group chat with up to 128 people. Wire is free. wire.com

Screenshots from Chrome Web Store