D4 Terms of Use

Effective 16 October 2026 · Fort Mill Ventures

License

D4 is licensed to you under Apple’s Licensed Application End User License Agreement. That agreement governs your purchase and use of D4.

What you need

D4 requires iOS 27 or later and a compatible iPhone or iPad.

What D4 does

D4 enhances the sound of other apps on this device only. It cannot guarantee that every app, or every future version of iOS, works with it. Known limits are listed on the support page.

No account, no data collection

D4 has no account and collects no data. See the Privacy Policy.

As is

To the extent the license agreement above allows, D4 is provided “as is”.

Contact

Questions: [email protected]