Voice recognition on iOS/android? [on hold]

I need to achieve the following scenario on iOS and Android:

For word "hello", the user speaks "hello", the phone recognises it, and tells how well it matches it.

I performed research online and understood that this was a Shazam-scenario and there were articles that explained how it works e.g. creating Fast Fourier Transformation and hashes. The following article provides some detailed explanation about this: http://royvanrijn.com/blog/2010/06/creating-shazam-in-java/

My question is: do I have to implement this ground up by my myself? is there any better way to achieve this for new developers like me?

Any guidance will be appreciated!