RT60, frequency response & SPL meter — speaker & room acoustics tools.
Stain Acoustics is a paid Android tool for RT60, frequency response, and SPL analysis using either the device microphone or a calibrated USB mic with a .cal file. It bundles Room Analyser, Simple Sweep, Speaker Lab, and Sound Check for comprehensive room and speaker measurements, with a privacy-first design—no ads, no analytics, and data stays on-device. With 10+ total downloads and 2 in the last 30 days, it targets serious acoustics work on mobile.
Pros & Cons
Privacy-first design: no ads, no analytics, and data stays on-device.
USB microphone support with .cal files and automatic calibration.
One-time purchase: all features unlocked with no subscriptions.
Exports FRD for industry tools (XSim, VituixCAD) and supports multi-angle measurements.
Very limited initial adoption with 10+ downloads and no ratings yet.
Best accuracy requires a USB measurement mic; phone mic alone is not measurement-grade.
Price may be a barrier for casual users.
About Stain Acoustics: RT60 Meter
Stain Acoustics: RT60 Meter is a music & audio app developed by House of Stain.
Download Statistics
Stain Acoustics: RT60 Meter has been downloaded 13 times. In the last 30 days, the app was downloaded 2 times.
User Ratings
The app has no ratings yet.
App Information
Stain Acoustics: RT60 Meter costs $10.99 to download. The APK download size is 8.55 MB. The latest version available is 1.5.0. The last update was on July 8, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on Google Play May 2026.
Description
Stain Acoustics is an acoustic measurement and loudspeaker analysis tool for Android. Use your phone's microphone — or plug in a USB measurement mic with a .cal file — and get the numbers that matter: RT60, frequency response, harmonic distortion, and more, all computed from a single log-sweep recording.
WHAT'S INSIDE
Room Analyser Measure reverberation time (RT60) using the ISO 3382 T20 method, clarity (C80), early decay time (EDT), definition (D50), signal-to-noise ratio, per-octave RT60, and the full frequency response. See the Schroeder decay curve on a tappable chart, compare octave bands side by side, and read interpretive notes on what the numbers mean for your room. Diagnostics flag room modes and speaker-boundary interference (SBIR) notches with predicted boundary distances.
Simple Sweep A fast single-speaker test. Measure frequency response (with selectable 1/12, 1/6, 1/3 and 1/1 octave smoothing), harmonic distortion (THD plus H2, H3, H5), step response, impulse response, energy-time curve (ETC), waterfall (cumulative spectral decay), unwrapped phase, and group delay. Export results as FRD for XSim, VituixCAD, or any industry-standard crossover tool.
Speaker Lab Build a library of speaker profiles and take multi-angle measurements (0°, ±15°, ±30°, ±45°...) to study directivity and off-axis response.
Sound Check A calibrated C-weighted SPL meter (dB(C) per IEC 61672) with automatic level adjustment — finds the right playback volume for a sweep so you get a clean measurement every time.
Microphone calibration Upload a .cal file for your USB measurement microphone; the sensitivity header is parsed automatically. No USB mic? Run the phone-microphone calibration wizard, which compares your phone against a USB reference and generates a correction curve. A manual sensitivity override is also available for users who can compare against a known SPL reference.
Recommended hardware The Dayton Audio iMM-6C is a calibrated USB-C measurement microphone we recommend for accurate readings — drop in its .cal file and the app applies the per-unit correction automatically. The iMM-6C is one example among other calibrated USB measurement mics the app supports; any mic with a standard .cal file will work.
TECHNICAL DETAIL
• Farina exponential log-sine sweep (20 Hz – 20 kHz, 10 s, 48 kHz) • Wiener-regularized frequency-domain deconvolution with SNR-adaptive regularization • 1 kHz acoustic sync pulse + cross-correlation to eliminate Android, USB, and Bluetooth playback-latency jitter • Zero-phase 2nd-order Butterworth bandpass per ISO octave band • T20 RT60 estimation with T30 fallback (×3 / ×2 extrapolation) • Schroeder backward integration • Farina harmonic extraction from time-shifted echoes in the deconvolved impulse response • C-weighting filter per IEC 61672, normalized to 0 dB at 1 kHz
Plays through the built-in speaker, 3.5 mm jack, USB DAC, or Bluetooth. Records through the phone mic or a USB audio interface using the Unprocessed input preset — AGC and noise-suppression are disabled.
BE REALISTIC ABOUT PHONE MICS
A phone microphone is not a measurement-grade instrument. For qualitative room diagnostics, A/B speaker comparisons, and setting playback levels it works well, especially after running the phone-mic calibration wizard. For quantitative work — reports, certifications, or any claim backed by numbers — plug in a proper USB measurement microphone with its .cal file.
PRIVACY
No ads. No analytics. No trackers. No network calls at all. Recordings and measurements stay on your device. The full privacy policy is linked on this Play Store listing.
ONE-TIME PURCHASE
Stain Acoustics is a paid app. No subscriptions, no in-app purchases, no ads — one price, all features unlocked.
COMING SOON
• Sub Crawl — optimal subwoofer placement via bass-only multi-point SPL minimization.
Questions or bug reports? Email sales@houseofstain.com — you'll reach me, the developer, directly.
Recent changes: What's new in 1.5.0
Room Analyser rebuilt: • Guided wizard measures each speaker on its own, then both — two speakers playing together cancel the very room modes you're hunting • Compare speakers side by side; the fix list names the culprit — the room, a speaker, or your seat • RT60 now reaches down to 50 Hz, plain-language captions on every chart
Sub Crawl (beta): walk-the-room subwoofer placement
Plus: more accurate THD, locale-safe exports, fewer false warnings, crash fixes
Get a detailed PDF report for Stain Acoustics: RT60 Meter with download trends, rating history,
and key performance statistics — useful for competitive research or tracking your own app.
Learn more
Are you the developer of this app? Join us for free to see more information about your app and learn how we can help you promote and earn money with your app.
Comments on Stain Acoustics: RT60 Meter for Android
We don't have enough comments to show example comments. Please check back later.
Google Play Rankings for Stain Acoustics: RT60 Meter
This app is not ranked
Technologies used by Stain Acoustics: RT60 Meter
3 permissions
Subscribe to see full permission and library details
Trust & Safety: Privacy-first: No ads, no analytics, no trackers. Recordings and measurements stay on-device. The app requests RECORD_AUDIO and license verification; users should review permissions and the developer’s privacy policy.
Back to top
AppBrain Intelligence premium content
Subscribe now to get full and unlimited access to AppBrain Intelligence.
You'll have access to:
Each subscription will automatically renew 3 days before the expiration date for
the same time period. Subscriptions can be cancelled at any time before the renewal.
