WikiPadia is a beautiful, customisable Wikipedia reader. It was specifically built for leisurely, late-night reading on an iPad.
The themes and options provide you with the ability to customize your reading experience, as well as the ability to add your own CSS which is saved locally to your device.
The inverted theme allows for better night/low-light reading by re-inverting and darkening images to better display when the Invert Colors setting is enabled — Found in Settings > General > Accessibility > Invert Colors on iOS.
Try it out at wikipadia.xyz.
The compiled app runs entirely client side, but to run it in development you'll need NPM & Gulp.
Simply npm install and then gulp to run the server.
This is still in very early development — contributions and ideas are welcome!