Diary Apps and Daily Journal
If you simply can not part with your phone or laptop, there are many applications that promise privacy and security, as well as writing a good atmosphere. If you prefer free and open source, there are some apps you can choose in your phone store.
You don’t have to use apps at all. You can just keep an encrypted text file in Dropbox, use Evernote or Google Keep, or any other note-taking app you prefer. You can even roll your own custom journaling system with whatever tools you prefer, but know that the more you automate the process, the less you’re actually journaling, so you don’t get the same benefits.
