Dash is an API Documentation Browser and Code Snippet Manager.
Dash seems to be the app to go to if you need an intuitive user interface and a comprehensive built-in code snippet manager.
Dash is not free, you will have to purchase Dash using an In-App purchase.
Dash is free to download so that you can test Dash out as much as you want, in order to determine if it’s the right tool for you.
In addition, Dash also comes with Xcode, AppCode, Vim, Sublime Text, AppleScript, OS X Services and Eclipse integration.
All things considered, Dash, although quite pricey, is the tool you want if you need to keep all your code snippets at your finger tips.