Duolingo, like other language learning apps, has been offered as a freemium! This means that some of its features are available for free, while the other important part is available as premium [paid] and accessible to the public. Usroid, as the most up-to-date Android reference in Iran and a pioneer in the field of unlocking apps, has released the unlocked and modded version of Duolingo, in which all the premium and free features are available for free and without the need to pay dollars, allowing you to benefit from them without any time limitations