Decibel: Noise & Sound Meter

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