Some feedback on what I&#x27;d like to see or couldn&#x27;t find:<p>- preview option on the same page, C9 are the only ones I&#x27;ve seen that can do it but I think it&#x27;s something many of us do with window managers, that is improved by being in the same app and tab especially on non-computers.<p>- Code formatters that run on save, most of the web IDEs I&#x27;ve tried only support manually running JS Beautify and they lack the ability to automate it or use any other formatters.  Although it&#x27;s part personal preference, some repositories enforce formatting before accepting pull requests.<p>- databases, otherwise it will often require a server or database hosted somewhere else plus additional software to access and build the database.<p>- Dropbox integration so you can always have a copy of your code close at hand and outside an IDE.