The Appery.io App Builder uses Ace editor for its code editor. Ace is a powerful code editor and provides the following benefits and features:

• Full screen mode;
• Fast performance, fast validation and fast code assist;
• More editor features:
  • Multiple cursors;
  • Block selection;
  • Highlight all occurrences of a selected word allows for easy renaming variables at once in the whole block of code;
  • Find and Replace;
  • Expand and collapse blocks of code;
  • Undo and redo actions;
  • Autocomplete (CTRL + Space) option:

Large collection of useful hotkeys can be found here.