Vocab is a free Chrome add-on developed by Lu that provides translation services and helps users learn new vocabulary. With Vocab, users can easily translate highlighted text on web pages and view the translation in a floating modal. The translated text can be added to a glossary book for future reference or pronounced using the speaker button.

One of the key features of Vocab is the ability to display a random glossary card when opening a web page. This feature helps users memorize and learn new vocabularies by presenting them from time to time. Additionally, users can configure several settings for the extension, including selecting the source and target languages from a list of 24 options.

Vocab also allows users to set a CSS selector, so that every time an element with the specified selector is clicked, a random glossary card will appear. This further increases the exposure to new vocabularies while browsing the internet.

The add-on includes a vocabulary viewer where users can view, search, edit, export, import, and listen to the added vocabularies. It also provides a simple statistics view that shows how frequently new vocabularies have been added to the glossary book.

Vocab utilizes the Google Translation free API to achieve accurate translations. With its user-friendly interface and helpful features, Vocab is a valuable tool for translation and vocabulary learning on Chrome.