When you're on the go you want apps that are quick to open and quick to post. You want to stay away from apps that require more than 3 clicks. By the time you get in then you'll have lost your idea or train of thought.
Here are a few lightweight writing apps that are good tools for writing on the mobile device. I've ranked them by the from the fastest to to the slowest it takes to jot something down.
It opens up a new page every time you open the app. Drafts is the Swiss Army knife of mobile notetaking. It can export in any format and to any other network. Its countless options can get complicated though.
It opens up into a clean, minimalist writing environment. There are less export options to share and format unless you pay an extra $5.
This app is excellent for longform distraction free writing. It offers a bunch of view and formatting options as well. It even has a syntax button so you can watch your adjectives.
You can write in markdown in all three apps. All apps sync through Dropbox as well. The notes app on the iPhone is also a good free option for getting down text quickly but doesn't offer the same exporting and formatting tools.
Lightweight apps feed the overweight apps like Evernote where information gets uploaded for archiving. You can use Evernote to take mobile notes but it's a bit heavier than writing on notefocused apps. It takes Evernote too long to open up a blank page.
Ideas can be ephemeral if you don't write them down to remember them now. Start with some of the apps listed above so you catch everything and move on.
Wells Baum is a blogger that mixes beats, culture, and technology.