RTA SPL - Audio Analyzer Pro
Contains adsIn-app purchases
Everyone
info
500+
Downloads
About this app
Assessing a sound level or diagnosing a spectral imbalance normally requires a separate sound meter and spectrum analyzer, often expensive or imprecise on mobile — this audio analyzer combines both functions in a native Rust computing engine, with no garbage-collection latency.
🔒 100% Ad-Free • Pro Precision • Zero Data Collection
Enjoy a clean, distraction-free professional tool. The app contains no ads, requires no login, and collects no personal data.
Who is it for, and in what situations?
For a live sound engineer, the audio analyzer lets you fine-tune an equalizer by comparing the measured curve to a target curve (Harman, JBL House) and pinpoint the exact frequency of feedback using the high-resolution mode. For a car audio technician, the app offers dedicated calibration curves (Audiofrog, B&K Optimum, Step-Down) to tune the frequency response of a vehicle cabin. For a health and safety officer, the SLOW/FAST history with NIOSH/OSHA thresholds helps document prolonged noise exposure.
What you gain
Spot a tonal imbalance at a glance thanks to the colored spectral tilt line
Assess listening fatigue in a mix thanks to psychoacoustic sharpness (ACUM, Zwicker model)
Calibrate an audio system with precision thanks to target curves and their ±3.5 dB tolerance corridor
Track noise exposure over time thanks to L10/L50/L90 statistics and LRA
Catch clipping instantly thanks to real-time saturation detection
Key Features
📊 RTA spectral analysis
IIR constant-Q filter bank, resolution from 3 to 24 bands per octave
Live spectral centroid and bandwidth display
Sharpness (ACUM) overlay on high frequencies
🎚️ Professional SPL measurement
A-weighting compliant with IEC 61672, FAST (125 ms) and SLOW (1 s) integration
VU meter with color-coded safety zones and clipping badge
Time history, histogram, and L10/L50/L90 percentiles
🎯 Calibration and target curves
Reference curves: Harman, Audiofrog, JBL House, B&K Optimum, Half Whitledge
Two dynamic range modes: Studio (30–100 dB) and Live (50–120 dB)
Manual microphone calibration (RTA offset, SPL offset)
📘 Built-in learning
Explanatory tooltip on every parameter (theory, typical values, use cases)
A differentiating technical approach
Unlike tools that rely on a fixed-resolution FFT, this audio analyzer uses a constant-Q filter bank (CQT), which better matches human frequency perception. The constant-Q transform delivers better resolution in low frequencies than a classic FFT, whose resolution stays fixed regardless of where in the spectrum you're analyzing — a decisive advantage for precisely identifying a room mode or an EQ issue in the bass range. The signal processing engine, written entirely in Rust, avoids the garbage-collector latency found in competing apps built in Java or Dart.
Transparent pricing & privacy
The app accesses the microphone solely for real-time acoustic analysis. No audio is recorded or transmitted.
100% Ad-Free: No banners, no pop-ups, no interruptions.
Free core features: Essential functions remain available (3/6-band RTA, complete SPL measurement).
Pro Features: Unlock high-resolution 24-band RTA, pro target curves, and Live mode via a simple one-time lifetime purchase — no subscription, no recurring fees.
Install this audio analyzer to measure, calibrate, and understand the sound behavior of your environment starting with your next session.
🔒 100% Ad-Free • Pro Precision • Zero Data Collection
Enjoy a clean, distraction-free professional tool. The app contains no ads, requires no login, and collects no personal data.
Who is it for, and in what situations?
For a live sound engineer, the audio analyzer lets you fine-tune an equalizer by comparing the measured curve to a target curve (Harman, JBL House) and pinpoint the exact frequency of feedback using the high-resolution mode. For a car audio technician, the app offers dedicated calibration curves (Audiofrog, B&K Optimum, Step-Down) to tune the frequency response of a vehicle cabin. For a health and safety officer, the SLOW/FAST history with NIOSH/OSHA thresholds helps document prolonged noise exposure.
What you gain
Spot a tonal imbalance at a glance thanks to the colored spectral tilt line
Assess listening fatigue in a mix thanks to psychoacoustic sharpness (ACUM, Zwicker model)
Calibrate an audio system with precision thanks to target curves and their ±3.5 dB tolerance corridor
Track noise exposure over time thanks to L10/L50/L90 statistics and LRA
Catch clipping instantly thanks to real-time saturation detection
Key Features
📊 RTA spectral analysis
IIR constant-Q filter bank, resolution from 3 to 24 bands per octave
Live spectral centroid and bandwidth display
Sharpness (ACUM) overlay on high frequencies
🎚️ Professional SPL measurement
A-weighting compliant with IEC 61672, FAST (125 ms) and SLOW (1 s) integration
VU meter with color-coded safety zones and clipping badge
Time history, histogram, and L10/L50/L90 percentiles
🎯 Calibration and target curves
Reference curves: Harman, Audiofrog, JBL House, B&K Optimum, Half Whitledge
Two dynamic range modes: Studio (30–100 dB) and Live (50–120 dB)
Manual microphone calibration (RTA offset, SPL offset)
📘 Built-in learning
Explanatory tooltip on every parameter (theory, typical values, use cases)
A differentiating technical approach
Unlike tools that rely on a fixed-resolution FFT, this audio analyzer uses a constant-Q filter bank (CQT), which better matches human frequency perception. The constant-Q transform delivers better resolution in low frequencies than a classic FFT, whose resolution stays fixed regardless of where in the spectrum you're analyzing — a decisive advantage for precisely identifying a room mode or an EQ issue in the bass range. The signal processing engine, written entirely in Rust, avoids the garbage-collector latency found in competing apps built in Java or Dart.
Transparent pricing & privacy
The app accesses the microphone solely for real-time acoustic analysis. No audio is recorded or transmitted.
100% Ad-Free: No banners, no pop-ups, no interruptions.
Free core features: Essential functions remain available (3/6-band RTA, complete SPL measurement).
Pro Features: Unlock high-resolution 24-band RTA, pro target curves, and Live mode via a simple one-time lifetime purchase — no subscription, no recurring fees.
Install this audio analyzer to measure, calibrate, and understand the sound behavior of your environment starting with your next session.
Measure SPL and RTA spectrum in real time with professional-grade accuracy
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What’s new
What's new in this release:
• Added full GDPR & ePR compliance with the integrated User Messaging Platform (UMP) consent system.
• Added a "Privacy Options" menu in settings to easily manage ad preferences at any time.
• Full Google Play Billing integration for the Lifetime Premium Unlock.
• Improved real-time audio processing performance and stability.
• Bug fixes and UI optimizations.
• Added full GDPR & ePR compliance with the integrated User Messaging Platform (UMP) consent system.
• Added a "Privacy Options" menu in settings to easily manage ad preferences at any time.
• Full Google Play Billing integration for the Lifetime Premium Unlock.
• Improved real-time audio processing performance and stability.
• Bug fixes and UI optimizations.
App support
About the developer
ADAM Olivier
oliv3rdev@gmail.com
Le Hallay - Bouffere
85600 MONTAIGU-VENDEE
France
