Xournal++ Mobile allows you to share Xournal++ notebooks across all your devices.
Simply take notes, sketch on images, edit PDFs or continue your existing notebooks on your Linux device.
Xournal++ and Xournal++ Mobile are open source projects to provide an easy to use solution for students, scientists and creatives for sketching up anything you want.
Use pressure-sensitive stylus for realistic painting and handwriting
Sketch around and highlight in scanned images or photographs