The app works on devices with Android 4.1 or above on board and need the necessary fonts to be present on your device. It uses fonts in Android system in both direct input (characters mapped to keys) and transliteration mode.
“Users can directly type in their native language to any app installed in their phone. An installation wizard is included with the app to ease the setup process. Any novice user can install and setup the app for their language easily,” developer notes in Google Play description.

4 replies on “Indic Keyboard Android app supports typing in 15 languages”
That app is having less than 50 downloads yet but 185 ratings.. Kuch gadbad hai.. Sponsored article..?
It’s a free/open source software: https://github.com/smc/Indic-Keyboard
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the alternate product Adaptxt (https://play.google.com/store/apps/details?id=com.kpt.adaptxt.beta) is any day better. I use Malayalam and Hindi(occasionally) and Hinglish often.