RTA Audio for iPhone

Quick summary

RTA Audio is a free iPhone app from New Ball s.r.o. that provides both a live audio analyzer and a visualization suite with export capabilities. It’s designed for capturing, inspecting, and exporting detailed audio analysis for field work, studio checks, or hobbyist exploration.

Live analysis features

The app performs real-time spectral analysis using Fast Fourier Transform (FFT) combined with a selectable window function. Audio can be captured from the device microphone or from an attached external input; those recordings can be saved for later examination or exported for reporting.

Visualization and playback

Offline analysis results are shown as multiple synchronized views: spectrum graph, spectrogram, and waveform. Playback controls allow you to play, loop, seek within the recording, and change playback rate while keeping the visual analysis aligned with the audio.

Export and reports

Analysis can be exported as a PDF that compiles recording metadata, the spectrogram image, peak and RMS graphs, and a frequency-table listing maximum peaks along with the times they occur.

Core capabilities

• Pointer tool for inspecting specific frequency/time coordinates
• Peak and RMS input meters for live level monitoring
• RMS average display for observing overall energy trends
• Peak average visualization for transient tracking
• Peak-hold trace to keep top values visible over time
• Tone-scale presentation for musical/pitch-centered views
• Fixed frequency-range option to lock the displayed band
• Logarithmic frequency axis for musical and perceptual scaling
• Adjustable resolution for balancing detail versus performance

Audio input and FFT configuration

• Measurement mode and input gain control are available
• Sample rate: not specified in the original description
• Bit depth: 32-bit floating-point (Float32)
• Channel: mono input
• Frequency coverage: roughly 20 Hz to 20 kHz
• Dynamic range: approximately -100 dB to 0 dB
• FFT frame size: 8192 samples
• Overlap options: from about 60% up to 90%
• Multiple smoothing/window functions available for analysis
• Support for hardware acceleration to improve processing speed

Intended users

RTA Audio targets both professionals and audio enthusiasts who need detailed spectral inspection and straightforward exportable reports without complex setup.

Suggested alternative

eSound — MP3 Music Player Free is listed as a top recommended alternative for users looking for a different feature set or playback-focused experience.