[Android] Speccy Spectrum Analyzer App Free (Was $0.99) @ Google Play

Rated 4.6/5 from 775 reviews, has a download size of 8.8MB. Might be useful to some people. I would like to know how it detects “gas leaks” (͠≖ ͜ʖ͠≖)

Turn your phone into a Spectrum Analyzer. Speccy 📊 is an 'Audio Spectrum Analysis' tool, which visualizes the spread of sound frequencies in the audible (and inaudible) spectrum, detected through your device's microphone, using Fast Fourier Transform signal processing. It supports the most languages of any similar app (English, Spanish, Portuguese, Polish, German, Italian, Russian, French and Thai) and is the only app which also lets you export audio snapshot data to the clipboard (for plotting in Excel, etc). Speccy 📊 has a wide variety of uses, such as:

• Assessing environmental noise for health and safety
• Sound checking venues PA systems and in-car stereos
• Identifying audio signals obscured to the human ear by noise
• Testing the microphone on your device
• Comparing the quality of different brands of headphones
• Testing signal generators
• Tuning musical instruments
• Measuring audio signals just outside human perception. As people age over 20 years, their aural perception range drops well below 21 kHz

Speccy 📊 has been used successfully to find gas leaks, test ultrasonic pest control equipment and has even used by EVP enthusiasts to try and detect ghosts! You can learn more about using spectrum analyzers here.