FreqLens
Professional-grade audio frequency analyzer with real-time spectrum visualization and parametric EQ precision
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Professional-grade audio frequency analyzer with real-time spectrum visualization and parametric EQ precision
Choose your frequency analysis bonus package and start with professional tools
All features permanently free. No in-app purchases. No subscription required. Available for Android 8.0 and higher. Some advanced features require device microphone permission.
FreqLens implements Fast Fourier Transform algorithms with configurable FFT sizes from 512 to 8192 samples, delivering frequency resolution down to 5.4 Hz at maximum settings. The engine processes audio input through a Hann windowing function to minimize spectral leakage, ensuring accurate peak detection across the entire 20 Hz to 20 kHz audible spectrum.
The real-time spectrum analyzer refreshes at 60 frames per second, visualizing frequency magnitude on a logarithmic scale with color-coded intensity mapping. Waterfall spectrogram mode renders time-domain frequency evolution with adjustable decay rates, allowing users to track transient audio events and sustained harmonic content simultaneously.
The integrated 31-band parametric equalizer operates with precise Q-factor control for each frequency band, enabling surgical frequency adjustments. Peak detection algorithms automatically identify dominant frequencies with sub-Hz accuracy, displaying exact values in both linear and musical note formats with cent deviation calculations.
Configurable Fast Fourier Transform with FFT sizes ranging from 512 to 8192 samples. Hann windowing minimizes spectral leakage while maintaining frequency resolution down to 5.4 Hz. Logarithmic frequency scale visualization with adjustable dB range from -120 dB to 0 dB for comprehensive dynamic range coverage.
Time-frequency domain visualization displaying frequency content evolution over user-defined time windows. Color-gradient intensity mapping represents magnitude levels with customizable decay rates. Captures transient audio events and sustained harmonics simultaneously for comprehensive acoustic analysis.
Professional-grade equalizer with 31 ISO-standard frequency bands from 20 Hz to 20 kHz. Independent gain control per band with range of ±12 dB. Adjustable Q-factor settings enable precise frequency sculpting from broad shelving to surgical notch filtering.
Automatic identification of dominant frequency components with sub-Hz precision. Displays exact frequency values in linear Hz and musical note notation including octave number and cent deviation. Real-time tracking of up to 10 simultaneous peaks with magnitude and harmonic relationship analysis.
User-definable frequency range markers for monitoring specific bands of interest. Color-coded overlay system allows simultaneous tracking of multiple frequency zones. Ideal for acoustic room analysis, speaker tuning, and musical instrument fundamental tracking.
Export frequency analysis data in CSV format containing time-stamped magnitude values across all analyzed frequency bins. Enables external processing in audio analysis software, statistical analysis tools, or custom data visualization applications for advanced acoustic research.
Developer: AudioTech Labs
Version: 2.1.4 released June 2026
Platform: Android 8.0 and higher with microphone access
Support: Actively maintained with regular algorithm optimizations and feature updates based on professional audio engineer feedback
Free for Android 8.0 and higher. No registration. No ads. Installs in under 30 seconds. Immediate access to all analysis tools.
Download for AndroidRequires microphone permission • Age rating: Everyone • 12 MB download size