Sound Frequency Analyzer
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About this app
Turn your phone into a real-time audio spectrum analyzer. Sound Frequency Analyzer captures live sound through your microphone, runs a fast Fourier transform (FFT), and shows the full frequency spectrum right in front of you — Hz across the bottom, dB up the side.
The dominant frequency is displayed in big, easy-to-read numbers, with the nearest musical note shown next to it (for example, 440 Hz ≈ A4). Great as a quick tuning reference or for seeing exactly what a sound is made of.
KEY FEATURES
▸ Live frequency spectrum (Hz vs dB), updated in real time
▸ Dominant frequency shown in large digits
▸ Nearest musical note (A4, C#5, and more) in standard notation
▸ Peak hold to freeze the highest points
▸ Freeze / resume to study a moment in detail
▸ Frequency band guides and 50/60 Hz hum reference lines
▸ Clean, distraction-free interface
WHO IT'S FOR
▸ Audio engineers and mixing engineers checking the spectrum
▸ Music producers analyzing tones and harmonics
▸ Musicians looking for a fast tuning reference
▸ Anyone diagnosing noise or electrical hum — quickly find power hum at 50 Hz or 60 Hz
▸ Teachers and students exploring sound and acoustics
▸ Audio demos and experiments
PRIVATE BY DESIGN
Everything runs on your device. No audio is recorded or saved, and no internet connection is required.
IMPORTANT — ACCURACY NOTE
A phone microphone has a limited frequency response. Very low and very high frequencies are captured less accurately, and absolute dB levels are not calibrated. This app is a practical measurement and diagnostic tool for everyday use — it is not a substitute for professional laboratory equipment.
Free to use, supported by ads.
The dominant frequency is displayed in big, easy-to-read numbers, with the nearest musical note shown next to it (for example, 440 Hz ≈ A4). Great as a quick tuning reference or for seeing exactly what a sound is made of.
KEY FEATURES
▸ Live frequency spectrum (Hz vs dB), updated in real time
▸ Dominant frequency shown in large digits
▸ Nearest musical note (A4, C#5, and more) in standard notation
▸ Peak hold to freeze the highest points
▸ Freeze / resume to study a moment in detail
▸ Frequency band guides and 50/60 Hz hum reference lines
▸ Clean, distraction-free interface
WHO IT'S FOR
▸ Audio engineers and mixing engineers checking the spectrum
▸ Music producers analyzing tones and harmonics
▸ Musicians looking for a fast tuning reference
▸ Anyone diagnosing noise or electrical hum — quickly find power hum at 50 Hz or 60 Hz
▸ Teachers and students exploring sound and acoustics
▸ Audio demos and experiments
PRIVATE BY DESIGN
Everything runs on your device. No audio is recorded or saved, and no internet connection is required.
IMPORTANT — ACCURACY NOTE
A phone microphone has a limited frequency response. Very low and very high frequencies are captured less accurately, and absolute dB levels are not calibrated. This app is a practical measurement and diagnostic tool for everyday use — it is not a substitute for professional laboratory equipment.
Free to use, supported by ads.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Device or other IDs
Data is encrypted in transit
What’s new
Stability improvements and bug fixes
