This is the Gayatri Mantra very powerful and very effective.
Oṃ bhūr bhuvaḥ svaḥ
tát savitúr váreṇ(i)yaṃ
bhárgo devásya dhīmahi
dhíyo yó naḥ pracodáyāt
This Gayatri Mantra is a free app where can anyone can download this application once they downloaded this app, this app not only gives you information about the mantra, it explains about the benefits of Chanting Gayatri Mantra,the Meaning of Gayatri Mantra word by Word,at the last page you can listen to the Mantra through Inbuilt audio player.
Overall a complete guide to Gayatri Mantra to anyone know the meaning and Chant Gayatri mantra which is one of the important duties of anyone who is born as a Hindu / Brahmin.