Sec Notes is described as 'An android app for writing and storing AES-128 encrypted notes. Supports notes, checklists and even spreadsheets. It is the only app in play store offering multiple security options like password protection, pattern lock and pin lock' and is a Note-taking tool in the office & productivity category. There are more than 100 alternatives to Sec Notes for a variety of platforms, including Windows, Mac, Android, Linux and Web-based apps. The best Sec Notes alternative is Zim, which is both free and Open Source. Other great apps like Sec Notes are TagSpaces, CherryTree, Trilium Notes and Cryptee.