RTA SPL - Audio Analyzer Pro

Transform your device into a professional real-time acoustic analyzer. RTA SPL combines a fractional-octave IIR spectrum analyzer and an advanced IEC sound level meter on a single, unified display.

Powered by a native Rust DSP core, it guarantees zero-latency audio processing without the lag of standard apps. Monitor 11 vital acoustic metrics simultaneously without ever navigating through menus.

📊 11 METRICS AT A SINGLE GLANCE

- Core Metrology: Leq 5s (equivalent continuous level), LRA (Loudness Range), L50 (median ambient level), and CRST (crest factor).

- Instant Spectral Pitch: Dominant musical note (e.g., A#2) and exact frequency (Hz).

- Psychoacoustics: Zwicker ACUM sharpness for high-frequency fatigue assessment.

- SPL Bar: SLOW (1s), FAST (125ms), and continuous PEAK decay monitoring.

🎛️ HIGH-PRECISION SPECTRUM ANALYZER (RTA)

- Constant-Q IIR filter bank with 3, 6, 12, and up to 24 bands per octave for ultimate EQ precision.

- Linear regression spectral tilt line (beta) to instantly identify noise color (pink, white, brown noise).

- Real-time spectral centroid and active -3 dB bandwidth marker.

- Built-in industry target curves (Harman Room, Audiofrog, JBL House, B&K Optimum, Half Whitledge) with a ±3.5 dB tolerance corridor.

🔊 IEC 61672 SOUND LEVEL METER & STATISTICS

- Type-standard A-weighting with true-RMS exponential ballistics.

- Time history and continuous sliding statistical histogram (L10, L50, L90).

- Dual-mode dynamic range: Studio Mode (30–100 dB) and LIVE Mode (50–120 dB).

- Fast overload CLIP warning and color-coded acoustic safety zones.

🎯 BUILT FOR SOUND PROFESSIONALS

- Live Sound & FOH: Pinpoint feedback frequencies instantly and monitor stage SPL limits.

- Car Audio & Hi-Fi: Align cabin frequency response against professional calibration curves.

- Studio & Mastering: Check mix tonal balance and dynamic compression.

- Acoustics & Industrial Hygiene: Document noise floor surveys and prolonged noise exposure limits.

⚡ THE RUST NATIVE ADVANTAGE

Unlike standard tools relying on fixed-resolution FFTs, our constant-Q filter bank (CQT) matches human frequency perception, delivering unmatched resolution in the critical low frequencies. The signal processing engine, written entirely in Rust, bypasses Java/Dart garbage-collection latency for flawless real-time rendering.

🔒 TRANSPARENT PRICING & PRIVACY

Enjoy a 100% Ad-Free, distraction-free tool. Microphone data is processed strictly on-device in real time—no audio is ever recorded, stored, or transmitted.

Test the essential core features (3/6-band RTA, full SPL meter) completely free. Unlock the high-res 24-band RTA, pro target curves, and Live Mode via a simple, one-time lifetime purchase. No subscriptions, no recurring fees.