Duolingo Ninja is a browser extension whose core function is to sync vocabulary learned on the Duolingo platform and integrate it into everyday web browsing, helping you review by replacing on-page words.
The extension supports syncing your personal vocabulary from your Duolingo account; you can view and download your vocabulary list within the extension for on-page word replacements.
Currently, it primarily supports Chrome and Microsoft Edge; you can install it from the respective web stores.
Based on current information, the extension has offered promotional discounts in the past. For the latest pricing, please visit the official store page.
The extension requires access to your Duolingo account to sync vocabulary data. Users can review its privacy policy before use to understand what data is collected and how it is used.

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