Snapseed - Black and White Photograph Conversions with Drama

Hypocam - Ultimate Black & White Photography App

How to Take and Convert Black and White Photos on Android

Black and white photo Editing using the Lightroom CC mobile app

Apply filters on photos in iPhone Camera app | Black and White, Vivid etc

'GrayPix' Brings Black and White Filters to the Camera Roll

Hypocam for Android - Build Your Photo Black and White

Perfect B&W for iPhone and iPad - In-App Camera Overview & Tutorial