Subscriptions: Continuous Access to the Latest Tools and Features, Free to Try
You can download SoundMeter X for free. Standard SoundMeter functionality, including the Sound Level Meter and Noise Dosimeter, is free to use indefinitely. For access to more powerful tools and additional features, a subscription is required. You can try a subscription for free for up to 7 days.
Professional mobile sound level meter.
Perpetual License: Pay Once, Use Indefinitely
The 2018 versions of SoundMeter will continue to receive maintenance updates through 2021, after which they will continue to work indefinitely on compatible versions of iOS (iOS 10 through the latest iOS at the end of 2021).
Professional mobile SLM.
No subscription required.