Based on SoundMeter, the original sound level meter app for iPhone, SoundMeter Basic 2018 turns your iOS device into a handheld sound level meter (SLM) and noise dosimeter.

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SoundMeter Basic 2018 requires iOS 10 or later and is designed to take full advantage of the latest iPhone and iPad screens.

SoundMeter Basic 2018 will continue to receive maintenance updates through 2021, after which it will continue to work indefinitely on compatible versions of iOS (iOS 10 through the latest iOS at the end of 2021). In order to receive maintenance updates, SoundMeter Basic 2018 must remain for download on the App Store. However, it is not recommended for new downloads, unless you need to run it on an iOS device that cannot be upgraded past iOS 10 or iOS 11.