Learning a sign language requires tons of visual elements, including images and videos.
So, it is not easy for any developer to create an app that can teach you the American Sign Language or any other sign language entirely.
Memrise can help you learn the basics.
The subscription cost for the premium version of Memrise is $9 per month and $59.99 for a year.Sources : https://office8.uk.net/5-fantastic-american-sign-language-apps-for-android/Signing Exact EnglishSigning Exact English is quite a decent American Sign Learning app that features a dictionary of more than 4,000 signs, a straightforward user interface, affixes, and many more things.
The app works pretty well, and you can avail yourself of it for $8.25.SignSchoolSignSchool is a newly launched American Sign Language learning app.
It provides you with an extensive dictionary of categorized signs along with a random sign generator.