If you ever feel the need to note down anything but you don't have access to pen and paper, you can simply do the task with your smartphone. Adler Notes allows you to write down important notes in your smartphone and store them for as long as you want. It is free, simple and has a user interface that even kids can master.
This app can function as your personal notebook or diary. You have the option to use different colour settings as well as tags to organise your notes as per your desire. You can even take pictures to accompany your notes as well as audio recordings. You can also schedule reminders with it if you're the type who keeps forgetting about the things you need to get done.
Try out this amazing app if you're someone who prefers to keep things simple and digital.