We were one of the first Starbuck Secret Menu apps, and even though there were lots of competitors, we've stayed one of the best.
The original app we sold and has had more than 11,000 downloads and been in the top 10 Food & Drink apps numerous times and in the top 1000 overall apps multiple times as well (our best ranking overall was #427 US).
Our Free edition (with ads) has almost 22,000 downloads and AdMob code installed. You can add your own ad code that you want.
Between both apps, we have over 30,000 users and add about 60+ every week. More updates and better ad utilization will probably create even better metrics.
These apps are iOS only, but we can add in Android at the purchase price.