Overview of the Duolingo App Development Cost If you wish to develop it for a single platform like Android or iOS, the development cost of an app like Duolingo can range from $25,000- 100,000. However, If you want to develop an app like Duolingo for a hybrid platform, then the app development cost might range from $80,000- $150,000. Now, this is just a rough estimate of your Duolingo app cost....