This application was downloaded and set up by over 10K users and its latest stable release was on Oct 18, 2020. Take into account the important moment: advertisements are a part of the app and it provides in-app purchases. A free .apk installation package of Simply Learn Punjabi 4.2.1 can be downloaded from Droid Informer and you can have a look at users' reviews on this site. Prepare 15 MB of free space on your device for this app installer and keep in mind that it works fine on Android 4.3 and higher.
Based on the users’ reviews, the strong side of the app is an awesome design.