The app is free. For subscription options, you need to pay $10/month.
Adobe Lightroom has two versions: Lightroom CC and Lightroom Classic CC. The classic version is the standard in photo editing. Professionals love and use the classic version, but the simplified version comes with some cloud-syncing features. Adobe Lightroom, the well known photo editor for smartphhone is available on Android and iOS.
Above all, the professional version is a full-featured photo editor, with RAW photo support. It also provides watermarking, adjustment, and exposure. And much more. The app is free to use. If you want to use the premium functions, you need to pay $10/month. It means that you will have access to the Adobe Photography Creative Cloud plan. You will have the chance to access Lightroom Classic and Photoshop on the desktop.
Generally, Adobe Lightroom CC also has a built-in camera that offers long exposure, RAW pictures, and other useful advanced tools.