Snark SN-1 and Samsung Galaxy S4 App Guitar Tuner Comparison

It would be interesting to see the comparison between guitar electronic tuner and mobile phone app tuner.  Here in my video, I tested the Snark SN-1 tuner and Samsung Galaxy S4 tuner App Pitch Lab.  These 2 tuners are using different sensors.  The Snark SN-1 is using vibration sensor which detects the string vibration from the guitar head stock.  The Samsung smart phone App uses the phone microphone to assess the frequency of the sound it receive.  With this sound frequency, the App shows the corresponding guitar note or key.  It is amazing that both tuners gave good results and exactly the same values.  However, in a noisy environment, the smartphone App cannot be used since the noise mixes with the sound coming from the guitar string thereby giving false frequency value.  Please view my video demo. Thanks.