Language is C++ for libraries and sketches.
Server is java.
Compiler I don’t know off hand.
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Compiler is AVR 
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AVR or AVR C?
Thank You so much. 
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Most sketches are written in C++, but there are Blynk libraries available in Node.js, Python etc.
However, I think you’re side-tracing yourself with these questions (unless you’re a student and need to provide this information as part of your submission).
You’d be better thinking about the logic of your program flow rather than getting to caught-up in the other stuff.
Pete.
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yeah. u are right. I’m a beginner and I’ve already learned many things about blynk. It was just from curiousity.
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