What are some alternatives?
When comparing Reflection.app and Pine, you can also consider the following products
Heyday - An automatic journal that makes remembering beautiful & fun
Typora - A minimal Markdown reading & writing app.
CustomJournal - Flexible structured journaling with customizable prompts
Caret - Better Markdown Editor for Mac / Windows / Linux
Sol Journal - A simple, open-source personal journaling platform
Dillinger - joemccann has 95 repositories available. Follow their code on GitHub.