Does Decibel X:dB Sound Level Meter work on iPhone Duo?

Yes. Decibel X:dB Sound Level Meter is updated for iPhone Duo and uses the full inner display. Version 9.9.8 (October 11) release notes: “Full support for the iPhone Duo”

Is Decibel X:dB Sound Level Meter letterboxed on iPhone Duo?

No. Decibel X:dB Sound Level Meter fills the inner display.

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Decibel X:dB Sound Level Meter

Name: Decibel X:dB Sound Level Meter
Author: SkyPaw Co., Limited

SkyPaw Co., LimitedUtilities

View in the App Store

On iPhone Duo

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Decibel X:dB Sound Level Meter fills the inner screen and adapts when you fold.

Version 9.9.8 (October 11) release notes: “Full support for the iPhone Duo”[1]

How we know: Claimed by the developer
Latest version: 9.9.8, Oct 11, 2026
Status updated: Oct 18, 2026

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Sources

App Store: Decibel X 9.9.8 release notes

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