I used this for a while at work to track some trial-and-error performance tuning of Java apps. Not being able to go back and change your text frees you from the desire to make each sentence perfect.
When you’re writing code it’s easy to lose track of what you did and when you did it. By timestamping your notes and writing them to a yaml file containing the raw text, you can keep your notes and grep them too.
You can check out the app, and download it at vogtb.github.io/captains-log/.