Spectrum Analyzer Desktop
RTA (FFT / Octave Analysis)
Only for Mac
Free · In‑App Purchases
Mac
( Please also try iOS app "Audio / Spectrum Analyzer." )
This RTA app supports simultaneous display of an audio waveform and an amplitude spectrum (FFT result magnitude at each frequency) from audio input through the microphone.
(FFT: Fast Fourier Transform, RTA: Real Time Analyzer)
Features
- Simultaneous waveform / spectrum display (with layout switching)
- Selectable FFT size
- Selectable window function
- Selectable frequency weighting (A-weighting, C-weighting, Z-weighting)
- Selectable spectrum X-axis (frequency) display type (Linear/Log)
- Display of spectrum peak level and peak frequency
- Peak Hold (displays held past peak values of the spectrum)
- Octave Analysis (displays the spectrum grouped into octave bands)
- Audio signal generation (4 waveform types)
- Pitch meter display
- Zoomed waveform and spectrum display
Feature Details
[Screen Layout]
Selectable screen layout:
- Wave: Waveform only
- Spectrum: Spectrum only
- Vertical: Waveform/spectrum arranged vertically
- Horizontal: Waveform/spectrum arranged horizontally
[FFT Size]
Selectable sample count for FFT:
1024, 2048, 4096, 8192, 16384
(*4096 and above are available in the Pro version.)
Smaller FFT sizes provide faster updates but lower frequency resolution.
Larger FFT sizes provide slower updates but higher frequency resolution.
[Window Function]
Selectable window function (multiplied just before FFT) used for spectrum calculation:
- Hanning: Hanning window
- Hamming: Hamming window
- Blackman: Blackman window
- None: No window function
[Frequency Weighting]
Selectable frequency weighting (used when measuring sound pressure level with sound level meters):
- Flat (Z-weighting): No frequency correction
- A-weighting: Correction based on human hearing characteristics
- C-weighting: Wider-band, relatively flat response compared with A-weighting
[Spectrum X-axis Display Type]
Selectable display type for the spectrum X-axis (frequency):
- Linear: Equal spacing
- Log: Logarithmic spacing
[Peak Hold]
Displays held past maximum (peak) spectrum values.
[Octave Analysis]
Displays spectrum data grouped into octave bands.
Division method:
- FFT: Standard spectrum display
- 1/12, 1/6, 1/3, 1 octave: Octave-band display (larger values use wider bands)
Calculation method:
- Max: Displays the maximum spectrum value in each band
- Average: Displays the average spectrum value in each band
[Pitch Meter]
Displays spectrum peak frequency as a meter and musical pitch (e.g., C3, G#4):
- Display on/off
- Accidental display selection (b / #)
[Audio Signal Generation]
Configurable generated audio signal:
- 4 waveform types: Sine, Triangle, Square, Sawtooth
- Frequency: 20 Hz - 20,000 Hz
Other
- Background color selection: Black, White
- Spectrum bar color selection: Solid, Colorful
- X/Y zoom and scroll display for waveform/spectrum view
Information
- Vertical line interval in waveform display: 2 ms
- Spectrum calculation uses the vDSP library
With the Pro version available via in-app purchase (FFT sizes 4096, 8192, 16384), you can use higher-precision spectrum analysis.
Ratings & Reviews
This app hasn’t received enough ratings or reviews to display an overview.
The developer, Loop-Sessions.LLC., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Loop-Sessions.LLC.
- Size
- 2.1 MB
- Category
- Music
- Compatibility
Requires macOS 15.0 or later.
- Mac
Requires macOS 15.0 or later.
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Pro (High-Res FFT) $19.99
- Copyright
- © Loop-Sessions.LLC.