Downloadable mobile applications for data management; Downloadable mobile applications for writing journal and diary entries; Downloadable mobile applications for privacy and personal information management, namely, protecting users' secret thoughts and daily notes; Downloadable mobile applications for protecting daily journal with lock; Downloadable mobile applications for protecting users' writing with pattern lock, 4-digit PIN, fingerprint lock; Downloadable mobile applications for tracking users' mood changes in calendar view; Downloadable mobile applications for showing time and date in different formats; Downloadable mobile applications for setting up and customizing notifications; Downloadable mobile applications for searching word documents by keywords or tags; Downloadable mobile applications for decorating writing with stylish fonts, text-colors, text-sizes, beautiful backgrounds, personal pictures, and emojis