Chilled out client-side check for humans and bonus options for doing server-side double check. A small JS file and some CSS. Degrades OK. Responsive. Easily customized. Very nice for you.
Demo: https://jessekorzan.github.io/rUhuman/
Dependancies: jQuery and mind grapes
- refer to SASS file: https://raw.githubusercontent.com/jessekorzan/rUhuman/master/_sass/styles.scss
- you down with PHP? https://raw.githubusercontent.com/jessekorzan/rUhuman/master/api.form.php