Halo Bahasa is a free android application. It is a program by the Language Development and Development Agency (LADA) of the Ministry of Education, Culture, Research, and Technology in Indonesia. 

This app aims to help people hone their fluency in Bahasa and other languages and dialects spoken in Indonesia.

With Halo Bahasa, users can get access to KBBI, UKBI, BUDI, SPAI, and other products from the Language Agency. They can also apply for linguistic services and even use the app to consult about any linguistic matter.

And if you see a language error on the streets or in other public spaces, you can immediately report that mistake on the app.