The language of Iwaidja is thousands of years old but on Croker Island in the Top End only about 150 people still speak it.
Iwaidja is one of about 50 known Aboriginal languages of Arnhem Land in the Northern Territory.
Bruce Birch from the Minjilang Endangered Languages Project has been working with locals to try to save it.
"It is one of Australia's hundred or so highly endangered languages," he said.
Using $100,000 of federal funding, a mobile phone application is being developed.
It will have 1,000 dictionary entries and almost 500 phrases.