NoteSR is described as 'Secure and offline-first note-taking Android app that creates an encrypted storage space on your device. You can write text notes, attach any type of file to them, and open files directly inside the app — all fully encrypted using AES-256' and is an app. There are more than 50 alternatives to NoteSR for a variety of platforms, including Mac, Windows, Linux, Android and iPhone apps. The best NoteSR alternative is Obsidian, which is free. Other great apps like NoteSR are Joplin, Super Productivity, Logseq and Anytype.