TRY IT at https://gaetanherve.github.io/rhythm-generator-v2
Rhythm-Generator is a web app displaying randomly generated rhythmic sequences and is designed for music students. This app uses Vexflow, an open-source JavaScript library for rendering music notation created by Mohit Muthanna Cheppudira. This is still a beta version.
Just choose your settings in "Options" menu then click on "Générer" button.