Sound Noise Meter+ dB SPL vs Decibel

Sound Noise Meter+ is a professional-grade sound level meter with built-in OSHA/NIOSH 8-hour noise dose tracking, A/C/Z weighting, and one-tap Quiet Room calibration. No hardware required — just your iPhone. The radial gauge displays live dB SPL from 0 to 120, color-coded green / yellow / red so you can read your environment at a glance. Switch to the Dose Panel to watch your 8-hour TWA build in real time, with separate OSHA (90 dBA / 5 dB exchange) and NIOSH (85 dBA / 3 dB exchange) accumulators. Key Features: • Real-time decibel measurement (0–120 dB SPL) • OSHA + NIOSH 8-hour noise dose tracking with TWA • A / C / Z weighting toggle (dBA · dBC · dBZ) • Quiet Room one-tap calibration (3-second auto-cal) • Animated radial gauge with color-coded noise levels • Live waveform chart with continuous monitoring • Min, Average, and Max dB tracking per session • Manual calibration adjustment (±20 dB) for precision tuning • 12 noise level descriptions with reference examples • Dark theme interface optimized for any environment Perfect For: • Checking workplace noise levels for OSHA compliance • Monitoring neighborhood and traffic noise • Measuring music venue and concert sound levels • Assessing classroom or office noise environments • Testing speaker and audio equipment output • Environmental noise surveys and studies The app features an intuitive dark interface with a professional radial gauge that animates smoothly as sound levels change. Track minimum, average, and maximum readings to understand noise patterns over time. The built-in calibration tool lets you fine-tune measurements for your specific device. Your privacy matters — all audio processing happens locally on your device. No recordings are stored or transmitted. Sound Noise Meter respects your privacy completely.

The honest sound level meter that tracks your real noise exposure. Turn your iPhone into a real-time dB(A)/dB(C) sound level meter — live waveform, peak, average, and Leq — then watch it roll into your daily NIOSH/OSHA noise dose. Fair pricing, no weekly traps. ▸ MEASURE SOUND INSTANTLY Open the app and start reading in real time — no setup, no sign-up. • Live dB(A) gauge + scrolling waveform — see the room react as it happens • Min, average, max, peak, and Leq — the numbers a real meter shows • "How loud is this?" scale — from rustling leaves to a jet engine • Clear Start/Stop and named sessions — measure, save, and revisit ▸ KNOW YOUR NOISE EXPOSURE Most apps stop at a single number. Decibel tracks how that noise adds up. • Daily noise-dose ring — NIOSH (85 dBA) and OSHA (90 dBA) standards • Loud-event alerts — a heads-up when sustained sound crosses 85 dBA • Exposure timeline + charts — see your week, not just this second • TWA and total exposure time — the metrics that matter for your hearing ▸ ACCURATE & TRUSTWORTHY Built to read honestly — and to tell you when it can't. • Measurement-mode capture — disables auto-gain for stable readings • Mic calibration offset — fine-tune against a reference meter • A, C, and Z weighting — dBA for hearing, dBC for bass and peaks • CSV & PDF reports — clean exports for complaints, work, or your records ▸ FAIR, HONEST PRICING The category's loudest complaint is price. We fixed that. • About half the price of the leading sound meter apps • No weekly traps, no à-la-carte unlock packs • A genuinely useful free tier — the live dBA meter is always free ▸ FREE VS PREMIUM FREE: • Live dB(A) meter with waveform, peak, average, and Leq • Today's noise dose • Your last 3 saved sessions PREMIUM unlocks: • Unlimited measurement history • dBA, dBC, and dBZ weighting + mic calibration offset • Full exposure timeline with charts • CSV & PDF noise reports • Zero ads ▸ PREMIUM SUBSCRIPTION Decibel Premium is available with the following subscription options: Monthly: $4.99/month Annual: $24.99/year — includes a 7-day free trial Payment will be charged to your Apple ID account at confirmation of purchase. Subscription automatically renews unless canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions by going to your App Store account settings after purchase. Terms of Service: https://decibel.bulpara.com/terms Privacy Policy: https://decibel.bulpara.com/privacy ▸ A NOTE ON ACCURACY Decibel is not a certified Type 1 or Type 2 sound level meter and is not a medical or hearing-diagnostic device. iPhone microphones are factory-calibrated and typically read within a couple of dB of professional meters, and the calibration offset improves them further — but for legal, occupational, or clinical decisions, use certified equipment. Questions or feedback? support@bulpara.com