RTA Audio Spectrum Analyzer

Professional ANSI Class 1 spectrum analysis with octave and third-octave bands. Export measurements to CSV, PDF, and JSON. Calibrate with built-in device profiles.

RTA Audio Spectrum Analyzer transforms your device into a professional-grade acoustic measurement instrument. Whether you are a sound engineer tuning a venue, an acoustician measuring noise levels, or an audio enthusiast optimizing your home theater, this app delivers the precision and features you need.

PROFESSIONAL-GRADE ANALYSIS

Built with ANSI S1.11 and IEC 61260 Class 1 compliant filters, RTA provides measurement accuracy that meets international standards. Choose between full octave and 1/3 octave band analysis modes to match your specific measurement requirements.

REAL-TIME SPECTRUM VISUALIZATION

Watch audio frequencies come alive with smooth, responsive spectrum displays. Switch between classic bar graphs and continuous line plots. Enable peak hold and minimum tracking to capture transient events and identify the quietest moments in your measurements.

COMPREHENSIVE NOISE CURVE OVERLAYS

Compare your measurements against industry-standard noise criteria including NC (Noise Criteria), NCB (Balanced Noise Criteria), PNC (Preferred Noise Criteria), RC (Room Criteria), NR (Noise Rating), and X-Curve for cinema calibration. Essential for HVAC noise assessment, room acoustics evaluation, and venue certification.

FLEXIBLE DECAY AND AVERAGING

Select from multiple decay time constants including Fast (35ms), Medium (125ms), Slow (500ms), and Very Slow (1s) to match measurement standards or personal preference. Choose between real-time display, peak hold, and running average modes.

DEVICE CALIBRATION

Built-in calibration profiles for popular iOS devices ensure accurate measurements right out of the box. Import custom calibration files for external measurement microphones to achieve laboratory-grade precision.

SAVE AND EXPORT MEASUREMENTS

Capture snapshots of your measurements and custom notes. Export your data in multiple formats including CSV for spreadsheet analysis, JSON for software integration, and PDF for professional reports.

KEY FEATURES

Real-time octave and 1/3 octave band analysis ANSI/IEC Class 1 compliant digital filters Overall SPL with A-weighting Peak and minimum level tracking with double-tap reset Six noise curve overlay standards Four selectable decay time constants Three averaging modes Bar and line visualization options Built-in device calibration profiles Custom calibration file import GPS location tagging for measurements Export to CSV, PDF, and JSON formats Dark theme optimized for low-light environments Portrait and landscape orientation support No advertisements or subscriptions

IDEAL FOR

Live sound engineers and FOH technicians Acoustic consultants and noise assessors HVAC and building services engineers Recording studio technicians Home theater enthusiasts Audio system installers Musicians and audio hobbyists Environmental noise monitoring Educational demonstrations

MEASUREMENT ACCURACY

All octave and 1/3 octave band filters meet or exceed ANSI S1.11 and IEC 61260 Class 1 specifications for center frequency accuracy and filter bandwidth. The app uses optimized FFT algorithms for low-latency, high-resolution frequency analysis.

PRIVACY FOCUSED

RTA processes all audio locally on your device. No audio data is transmitted to external servers.

Download RTA Audio Spectrum Analyzer today and experience professional acoustic measurement in the palm of your hand.

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