Sound Level Test
Measure noise in decibels with your microphone. Live dB meter with min, max and average, calibration and safe-exposure guidance. Free, private, no install.
A startup from Los Angeles, the United States.
Measure noise in decibels with your microphone. Live dB meter with min, max and average, calibration and safe-exposure guidance. Free, private, no install.
A startup from Los Angeles, the United States.
This page is designed to help you find out whether Sound Level Test is good and if it is the right choice for you.
Sound Level Test is a free, privacy-first online acoustic suite that measures sound levels and runs audio calculations directly in your browser. Powered by the Web Audio API, all microphone processing runs 100% on-device—no audio or measurement data is ever recorded, streamed, or uploaded to any server.
Key capabilities include: - Real-time dBA and dBC sound level metering with Fast/Slow time weightings. - OSHA & NIOSH permissible noise exposure calculator with shift dose projections. - Classroom noise monitor with visual silent alerts for interactive whiteboards. - Audio frequency & pitch detector with live FFT spectrum visualization. - Multi-waveform tone generator (sine, square, triangle, sawtooth) with frequency presets. - Decibel addition and distance attenuation calculators based on standard acoustic physics.
No account, download, or subscription required. Works instantly across desktop and mobile browsers.
Listed in
Browser Decibel Meter
Measures ambient sound levels (dBA and dBC weighting) in real time directly through your device microphone, with 100% on-device processing and zero audio recorded or uploaded.
Decibel Addition & Distance Calculators
Solves logarithmic acoustic math in seconds—combining multiple noise sources, subtracting background noise, or calculating sound decay over distance using the inverse-square law.
Online Hearing Age & Frequency Test
Plays calibrated, stepped high-frequency tones from 20 kHz down to 8 kHz to help estimate high-frequency hearing limits and compare them against age-related benchmarks safely.
Classroom Noise Monitor
Provides responsive visual volume feedback (green, amber, red) with customizable sensitivity thresholds to help teachers maintain quiet work environments without having to raise their voice.
Stereo Speaker & Headphone Channel Tester
Runs isolated left, right, and combined stereo audio checks with vocal prompts and frequency sweeps to diagnose channel wiring, headphone balance, and hardware faults.
Sound Level Test runs entirely in the client’s web browser without requiring app store downloads, user accounts, or external audio streaming. Unlike conventional noise meter apps that route microphone feeds through remote servers or monetize via intrusive ads, Sound Level Test uses the native Web Audio API for 100% on-device Digital Signal Processing (DSP). It combines real-time IEC 61672-compliant frequency weighting (dBA/dBC) with a full suite of statutory noise calculators, interactive audio diagnostics, and classroom management tools on a single, privacy-first platform.
-Zero Installation & Instant Access: Works instantly across phones, tablets, laptops, and smartboards on Chrome, Safari, Firefox, and Edge with no setup or sign-ups.
-Absolute Data Privacy: Microphone audio never leaves your local hardware; raw samples are processed purely in device RAM and discarded immediately.
-Acoustic Precision & Scientific Standards: Calculations adhere to official acoustic methodologies (OSHA 1910.95, NIOSH REL, WHO environmental noise guidelines, and ANSI/ASA S12.60 standards).
-All-in-One Acoustic Utility Suite: Beyond a simple meter, users get specialized tools for decibel addition, distance attenuation, stereo channel balancing, hearing frequency checks, and noise complaint logging.
-Completely Free with No Intrusive Clutter: Free from paywalls, forced subscriptions, or disruptive banner advertisements.
The primary audience spans four core user segments:
-Educators & School Administrators: Teachers seeking visual, gamified noise management displays for quiet study and group activities in classrooms.
-Tenants & Homeowners: Residents documenting neighborhood disturbances, barking dogs, construction, or traffic noise to build structured, verifiable complaint logs for landlords or local councils.
-Occupational Safety & Plant Managers: Safety officers checking workplace sound levels against OSHA/NIOSH daily permissible exposure limits (PEL) to protect workers from acoustic trauma.
-Audio Engineers & Tech Enthusiasts: Musicians, audiophiles, and podcasters calibrating studio monitors, checking stereo panning, analyzing microphone frequency response, or evaluating room acoustics.
Sound Level Test was created out of frustration with existing mobile sound meters, which had become bloated with invasive tracking permissions, paywalled decibel features, and intrusive full-screen video ads. Recognizing that modern web browsers possess powerful, low-latency audio processing capabilities through the Web Audio API, the project set out to build an accessible, privacy-respecting alternative. By making calibrated sound measurement and acoustic math transparent, freely accessible, and grounded in published statutory standards, Sound Level Test bridges the gap between unreliable toy apps and expensive dedicated hardware sound level meters.
-Framework: React 19 with TanStack Start (full-stack modern SSR/SSG architecture).
-Audio Engine: Zero-dependency, pure TypeScript DSP utilizing the native browser Web Audio API (AudioContext, AnalyserNode, BiquadFilterNode, and real-time canvas rendering).
-Styling & Design System: Tailwind CSS v4 and shadcn/ui component primitives for responsive, high-contrast UI across mobile and desktop.
-Hosting & CDN: Edge deployment via Vercel and Cloudflare with HTTP/3, Brotli compression, and automated CI/CD.
-Data Persistence: Local browser storage (localStorage / IndexedDB) for privacy-preserving, device-only history and complaint exports.
Please note that Sound Level Test is an open, privacy-first web utility that does not force logins or track corporate user identities, but our tools are actively utilized by members across key institutional and professional groups:
-K-12 public and private school teachers utilizing the Classroom Noise Monitor on interactive whiteboards.
-Remote workers and freelancers verifying ambient room noise for professional client calls and studio recordings.
-Tenants and apartment resident associations compiling structured records for municipal noise disputes.
-Small workshop and manufacturing business owners checking daily equipment shifts against OSHA compliance tables.
-DIY audio hobbyists and musicians calibrating left/right headphone balance and testing frequency cutoffs.
We have collected here some useful links to help you find out if Sound Level Test is good.
Check the traffic stats of Sound Level Test on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
Check the "Domain Rating" of Sound Level Test on Ahrefs. The domain rating is a measure of the strength of a website's backlink profile on a scale from 0 to 100. It shows the strength of Sound Level Test's backlink profile compared to the other websites. In most cases a domain rating of 60+ is considered good and 70+ is considered very good.
Check the "Domain Authority" of Sound Level Test on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
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