BLOCKRT
The first app specifically designed to test how well your acoustic foam, soundproofing panels, and insulation materials actually work.
Stop guessing if your soundproofing investment is effective — measure it.
Test Your Materials
The first app specifically designed to measure how well your acoustic foam, soundproofing panels, and insulation materials actually work.
Before/After Comparison
Professional measurement methodology guides you through baseline measurement, material installation, and results comparison.
STC Rating Calculator
Get your calculated Sound Transmission Class rating based on ASTM E413 standards. Compare your DIY results to manufacturer claims.
Frequency Analysis
See exactly which frequencies your material blocks best with detailed 16-band analysis from 125 Hz to 4000 Hz.
Professional SPL Meter
Full-featured sound level meter with A, C, Z weighting, multiple time constants, and IEC 61672 compliance.
Professional Reports
Generate comprehensive PDF reports with before/after data, comparison charts, and calculated ratings for documentation.
Test Your Soundproofing Materials
Whether you're building a home theater, recording studio, podcast room, or just trying to reduce noise between rooms, BLOCKRT gives you the tools to verify your acoustic materials are performing.
Before/After Comparison Testing
Our unique blocking test workflow guides you through professional measurement methodology — the same approach used in acoustic laboratories, now available on your iPhone or iPad.
Measure Baseline
Generate reference noise and measure baseline sound levels without any soundproofing material in place.
Install Material
Install your acoustic foam, panels, insulation, or any soundproofing material you want to test.
Measure Again
Take a second measurement with your material in place using the same reference noise.
View Results
See detailed comparison charts showing dB reduction per frequency band and your calculated STC rating.
Understand Your Results
BLOCKRT calculates ratings that acoustic professionals use. Compare your DIY results to manufacturer claims — most acoustic foam claims NRC ratings of 0.7-0.9. Now you can verify if that's true for your installation.
STC Rating
Industry-standard Sound Transmission Class rating calculated per ASTM E413. Compare to manufacturer specs and building codes.
Transmission Loss
See the dB reduction at each frequency band to understand exactly where your material performs best and worst.
Overall Reduction
Average decibel reduction across all measured frequencies for a quick summary of material effectiveness.
Frequency Analysis
Detailed breakdown showing which frequencies your material blocks. Compare to your specific noise problems.
Professional SPL Meter Included
Beyond material testing, BLOCKRT includes a full-featured sound level meter with IEC 61672 compliant measurements.
A-Weighting (dBA)
Standard for general noise assessment matching human hearing sensitivity. Most common for soundproofing evaluation.
C-Weighting (dBC)
Better for low frequency and bass noise measurement. Use when testing bass traps or low-frequency isolation.
Z-Weighting (dBZ)
Flat, unweighted measurements for true acoustic energy across all frequencies without human hearing compensation.
Real-Time Frequency Analysis
Visualize exactly which frequencies are problematic and see which frequencies penetrate your soundproofing.
Octave Band Analyzer
Full analysis from 31.5 Hz to 16 kHz
1/3 Octave Analysis
Detailed frequency response measurement
FFT Spectrum Display
Adjustable resolution for detailed analysis
Perfect For
Materials You Can Test
Generate Professional Reports
Document your acoustic testing with comprehensive PDF reports. Share with contractors or building inspectors.
- Before/after measurement data
- Frequency-by-frequency comparison charts
- Calculated STC rating
- Project and room details
Works With Any Microphone
Use your device's built-in microphone or connect professional measurement equipment for enhanced accuracy.
- Built-in iPhone/iPad mic with compensation curves
- External USB measurement mics (UMIK-1, etc.)
- Professional audio interfaces
- Calibration support for enhanced accuracy
Privacy Focused
Your data stays on your device. All measurements stored locally, no account registration required, no data uploaded to external servers. Complete control over your measurement data.
Stop Guessing If Your Soundproofing Works
Download BLOCKRT and measure the difference. Transform your iPhone or iPad into a professional soundproofing testing tool.
Download Now