An irony of the iPad is that while it's built to be a mobile device, none of the users I know own a cellular model. Pixelmator ClassicAvoid the subscription trapPixelmator / Pocket-lintWhile Adobe Photoshop is the industry standard for image editing, you're better off learning Pixelmator if you want to do offline work. You'd better hope you're online when that happens. That requires an Apple Creator Studio subscription, and you're not gaining much for Pixelmator specifically beyond the Warp Tool. You'll also need a subscription for basics like handwriting recognition, math conversion, iCloud sync, and unlimited note creation.