Nebo Viewer is the companion app to Nebo, offering users the ability to sync their library and access read-only versions of their notes on their iPhone. This app falls under the category of Business & Productivity and is developed by MyScript. With Nebo Viewer, users can sync their Nebo library and view their notes directly on their iPhone. The app also allows users to search their entire library, including handwritten notes, typed text, and annotations. Additionally, users can easily copy and paste content into other apps and export pages to various formats for easy sharing. It's worth noting that in order to use Nebo Viewer, users need access to cloud sync in Nebo as well as a free MyScript account.