Sound Meter - Decibel Meter is an impressive utility app developed by wang haiwen for iPhone users. It is a smart sound level meter app that can measure the noise volume in decibels accurately. This app has a range of useful features and high-quality graphics that make it stand out from the crowd.

One of the most impressive features of this app is its fast dB response, which ensures that you get accurate readings of the noise level in real-time. The app also has a gauge that indicates the values and shows the current noise environment. Additionally, it displays the minimum, average, and maximum values, providing a comprehensive overview of the sound levels.

Moreover, Sound Meter - Decibel Meter has a sound level graph that shows the noise level over a period. This feature is useful for tracking noise levels over time. The app can also calibrate the decibel for each device, making it highly accurate. Overall, this is the best sound level meter app for iOS devices that you can find on the App Store.