Hey there! Thanks for the question. While our mobile apps are not available in some non-English speaking countries, our web app (http://simplehabitapp.com/) is available worldwide. Try it out and let us know what you think!
At least the website seems to work well on mobile.
As of today, both the current version and all versions have a 5-star rating - the current one with 121 ratings, and 345 all-time ratings.