WeChat One‑Way Friend Detection Patent and How to Identify Deleted Contacts

When a WeChat contact deletes you, the app shows no notification; only a warning icon appears in the chat window, which can be frustrating for users.

Many people resort to third‑party "clean‑friend" tools to check who has removed them, but such apps often pose privacy and security risks.

On April 23, Tencent filed a patent titled “Method, device, medium, and computer equipment for one‑way friend detection in a social account,” which outlines a process to obtain a detection command containing the target account identifier, retrieve the first address book, compare it with a second address book, determine one‑way friend identifiers, and display the information in the social app interface.

The patent documentation includes screenshots showing a new option "Clean single friend" in the WeChat address book; selecting it reveals contacts who have removed you and allows bulk deletion via a button.

Although the feature remains in the patent stage and is not yet released, users note that similar functionality existed in QQ years ago and criticize the long delay before Tencent’s implementation.

The article concludes by advising users not to use existing third‑party friend‑status detection tools due to potential data leakage and fraud, and encourages feedback to improve WeChat’s own capabilities.