itms-services is a proprietary URL scheme used by Apple to communicate with the iOS App Store and to facilitate the installation of applications over the air (OTA).

If you have ever needed to distribute an iOS application outside the App Store—for enterprise teams, beta testing, or internal tools—you have likely encountered the cryptic yet powerful itms-services URL scheme. The full string often appears as itms-services://?action=download-manifest&url=https://... and understanding every component is crucial for successful over‑the‑air (OTA) installation. In this comprehensive guide, we’ll break down the keyword , explain how each part works, and show you how to build a robust OTA distribution pipeline.

The keyword “amp-url” in our topic refers to the URL‑encoded ampersand ( & ) that sometimes appears when writing the link inside an HTML attribute or XML document. In raw form, it’s simply &url= . We’ll clarify this encoding nuance later.

Because itms-services bypasses app review, Apple has strict security requirements: