Mastering Mobile Deep Links: How URL Schemes Enable Seamless App Navigation

What Is a Deep Link?

A deep link allows a user to click a link on a mobile device and be taken directly to a specific page inside an app instead of the app’s default home screen. Unlike web URLs that open any page directly, app pages require deep‑link technology.

Deep Link Technology Details

The core technology is the URL scheme, which works on both iOS and Android. It enables horizontal calls between apps (e.g., from APP‑F to APP‑T) as illustrated in the diagram below.

To invoke APP‑T from APP‑F, the following steps are required:

APP‑T configures a custom scheme (info.plist for iOS, activity for Android) and handles incoming parameters.

APP‑F checks whether APP‑T is installed on the device.

If not installed, it redirects to APP‑T’s web version or an app store for download.

If installed, it calls the configured URL scheme to open the target page directly.

Brief Introduction to URL Schemes

A URL consists of a scheme (the part before "://") such as http in http://www.apple.com. By defining a custom scheme, an app can be addressed like a web page, and parameters can be passed to open specific functions.

System‑level schemes already exist (e.g., sms:, tel:, ibooks:), so developers must avoid conflicts when choosing their own scheme names.

Key points:

An app must support a URL scheme to be opened by other apps.

An app that wants to open other apps must also implement scheme handling, device‑installation checks, and appropriate fallbacks.

Standards & Ecosystem

While URL schemes solve app‑to‑app navigation, challenges remain:

Cross‑platform seamless linking

Data transmission standards

Scheme naming conventions

Parameter and parsing standards

A unified industry standard and a robust ecosystem are needed for true seamless integration. Major players have introduced their own specifications:

Facebook: App Links

Twitter: Card

Google: Indexing

Other companies provide APIs/SDKs such as DEEPLINK.ME, Branch Metrics, URX, QUIXEY, and domestic services like “应用链”. An industry alliance (http://mobiledeeplinking.org/) also promotes collaboration.

Common App URL Schemes

Examples of widely used custom schemes:

WeChat: weixin://dl/scan, weixin://dl/moments, weixin://dl/settings …

Tencent Weibo: TencentWeibo:// Taobao: taobao:// Alipay: alipay:// Sina Weibo: sinaweibo:// QQ Browser: mqqbrowser:// UC Browser: ucbrowser:// Dolphin Browser: dolphin:// Sogou Browser: SogouMSE:// Baidu Maps: baidumap:// Chrome: googlechrome:// Youku: youku:// JD.com: openapp.jdmoble:// Renren: renren:// Meituan: imeituan:// Source: https://blog.csdn.net/neilyi007/article/details/79964474