What Is a Deep Link?

A deep link points to a specific destination inside an application, such as a product page, conversation, song, or event detail. Without one, users often land on the app's home screen and must search for the content manually.

Types of Deep Links

• Custom schemes use formats such as example://product/123. Another app may register the same scheme, so handling must be designed carefully.
• Web links use http or https, but they do not always open the installed app automatically.
• Verified App Links or Universal Links connect a domain with an app through an association file. The operating system can verify ownership and open the correct app.
• Deferred deep links try to continue to the intended content after installation. This usually requires an attribution service or additional implementation and is not automatic for every link.

What Should Be Tested?

1. Behavior when the app is installed
2. The web fallback when the app is unavailable
3. Invalid or expired parameter handling
4. Differences among Android, iOS, and browsers
5. Security of any data passed through the URL

For a campaign, a URL shortener can make an address easier to share, but it does not automatically convert a regular URL into a verified deep link. App integration and domain association still have to be configured by the application owner.

References

• Android Developers: About App Links
• Apple Developer: Supporting associated domains