Auto-complete window can be pop-ed up when I use <C-N>, could I set it to pop up automatically when input keyword exceeds some length (3 characters)? YCM can do this but I don't want to install it. Does the default completion support this?

2 Answers 2


Automatic completion suggestions aren't built into Vim; plugins (like YouCompleteMe) implement this via :autocmd CursorMovedI triggers.

Another plugin is AutoComplPop; it purely implements the automatic suggestions. Unlike YCM, it doesn't offer additional completions or any other extensions, so that may be a good alternative to try if you don't want to install YCM.


There is another nice plugin called mucomplete (https://github.com/lifepillar/vim-mucomplete) that shows automatically a popup with completion suggestions.

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