Hoyolab Language Filter is a free Chrome extension developed by Hu-Tao. It falls under the category of Browsers and is a subcategory of Add-ons & Tools. This extension allows users to hide non-Japanese posts on the Hoyolab home screen, specifically in the "Trend," "Latest Posts," and "Latest Replies" sections. By using this extension, users can customize their Hoyolab experience to focus solely on Japanese content.

However, it is important to note that the extension considers any post that contains at least one of the following characters: kanji, hiragana, or katakana, as Japanese and will display it accordingly. This means that posts in Chinese may also be displayed due to this specification.

It is worth mentioning that posts selected as "Featured" will always be displayed regardless of the language.

Additionally, if Hoyolab implements a similar feature in the future, this extension is planned to be removed.