Saber

Saber is an open-source Android application in the Note category, built around handwritten note-taking. It is intended for people who prefer writing notes by hand on devices of different sizes, including students using notes in classroom or study settings. The app focuses on a simple interface while providing tools for organizing, displaying, and protecting handwritten content. Notes can be synchronized across the user’s devices, allowing the same collection to be used on both larger and smaller screens.

Saber includes a dark-mode option that inverts notes so they can be written with white ink on a black background. This presentation is intended to make handwritten work easier to view in low-light situations. Images and PDFs within notes can also be inverted, which supports using digital printouts or textbooks with the same display treatment. Its highlighter uses canvas compositing to keep overlapping strokes consistent and prevent highlighted areas from obscuring text as heavily as they can in some other note applications.

The app provides nested folders for organizing notes, with no stated limit on how deeply folders can be placed inside one another. Recently used notes remain available from the home screen even when they are stored within several levels of folders. Saber also uses a dual-password system to protect notes, including when the server storing them is fully controlled by someone else. Notes may be stored on the official Saber server, another server, or a server hosted by the user.

As an Android Note application, Saber fits users who want handwriting-focused notes rather than a general text-only catalog entry. Its open-source license allows the source code and its handling of user data to be inspected publicly. MirrorNest mirrors the official Android build directly on its own storage and scans it for malware before publishing it. This distribution provides a catalog copy while identifying the official build as the source.