- GoodNotes (Apple Pencil) - Hand-writing Notes. Great tool for visual thinkers.
- PDF Viewer Pro by PSPDFKit - Free PDF reader that integrate with iOS Files and the annotation is compatible with Preview on Mac.
- LiquidText (Apple Pencil) - Flexible annotation using Apple Pencil for PDF.
- Graphic for iPad - Vector drawing and can be exported as SVG.
- Pixelmator Photo - Edit photos with color adjustment and many filters.
- Pixelmator for iOS - Layer editting for general image manipulation.