NoiseCheck: Decibel Meter

NoiseCheck turns your iPhone into a fast, accurate sound level meter. Open it and instantly see how loud your environment really is, at work, in your apartment, at concerts and events, in the studio, or anywhere noise matters.

A big, high-contrast dB(A) reading you can check at a glance, with color-coded zones that tell you immediately whether a space is safe, getting loud, or loud enough to harm your hearing.

MEASURE
• Real-time A-weighted dB(A) sound level, the standard for environmental noise
• Large, glanceable decibel display
• Color-coded zones: green (safe), yellow (caution), red (danger)
• Live Min / Average / Max for the session, with a timer
• Animated level meter so you can watch noise rise and fall

PROTECT YOUR HEARING
• Automatic warning when sustained levels exceed 85 dB
• Built-in reference guide for what everyday sounds measure
• Calibration adjustment (±10 dB) to match a reference meter

NO NONSENSE
• No ads
• No subscription
• No account or sign-up
• No recording, no network; your audio never leaves your device

One screen, one job: tell you how loud it is.

NoiseCheck is free to use for 3 days. After that, unlock it forever with a single $4.99 purchase. No subscription, ever.

Note: iPhone microphones vary, so for absolute accuracy calibrate against a reference meter; relative readings and zone behavior are reliable out of the box. NoiseCheck is a practical noise-measurement tool, not a certified sound level meter for occupational compliance.