Make Tech Easier: 5 of the Best Cross-Platform Note-Taking Apps. “Of all the apps on your smartphone or computer, there is a strong likelihood that your note-taking app of choice is one of the most used. For so many, having a note-taking app available whenever, wherever is indispensable. That’s why you need a cross-platform option, but which one do you choose? Let’s take at look at the best cross-platform note-taking apps below.” Google Keep is nowhere to be found.