21相机 is a free multimedia app developed by Beauty Inc for Android users. It offers a variety of features including photo and video editing tools, filters, and tutorials for capturing the perfect shot.

The app includes a "Pose" tutorial that teaches users how to take better photos in various scenarios such as selfies, couple shots, travel, and more. It also includes 27 different beauty filters that allow users to adjust everything from skin tone to facial features. Users can choose their preferred face shape from the app's six options - natural, round, long, square, diamond, and heart.

21相机 also offers a makeup and touch-up feature that includes lipstick, blush, eyebrow, and contouring effects. The app has a variety of filters to choose from, including Ins, Hong Kong-style, black and white, and more. Additionally, the app allows users to create music videos with just one click.

Overall, 21相机 is a comprehensive photo and video editing app that offers a wide range of features to enhance your photos and videos. It is an excellent choice for anyone looking for a free, easy-to-use photo and video editing app for their Android device.