A free app for Android, by XnView.

Black and white photography is a great way to give more focus to certain aspects of an image, such as its subject and texture. It can also evoke a particular mood.

If you want to black and white photos using your phone or tablet, then this app is for you. BlackCam is a camera app that allows you to use various filters to help you achieve the color that you want. With this, you can easily adjust the depth of grey tones by adjusting contrast, brightness, and exposure. You can also add simulated film grain and black vignetting to your image.