https://codeanywhere.com/about
Multi-platform, coding in the cloud including debugging, code folding, undo/redo, searching including RegEx, other stuff. Does syntax highlighting for 75 languages, does autocomplete for a handful of them like Python, PHP, JS, CSS, XML, HTML.
Seems to be really beneficial to integrate with GitHub, Dropbox, etc. across multiple devices (Android, iPhone, PC, Linux etc.)
https://codeanywhere.com/pricing
Free version has many useful features disabled of course but still might be all you need; additional features at very reasonable prices and could be handy esp. if you jump around between devices and/or languages.
found via the Google Play store where there's a Chrome extension or something...
https://chrome.google.com/webstore/detail/codeanywhere/jdofbmaiblhheoneemdjccjeeihbiabl