The best Indic keyboards for typing in regional languages?

Which are the best keyboard applications for typing in regional languages? These are some ones I found so far.

Swalekh Flip
Pros: Good design, available on iOS, themes, cursor control pad, small file size
Cons: Obscure app, user will have to be informed about it
Languages supported: 22

Google Indic Keyboard
Pros: Transliteration, Hinglish support, available from within Android OS
Cons: Large file size, limited languages, can type nonsense words, cramped layout
Languages supported: 11

Indus Swipe
Pros: OS level speech to text, free messaging, swipe to translate/transliterate
Cons: Not an app, available only on OS installed with phone on factory floor
Languages supported: 12