Sparkle by Sparkle

Sparkle replaces a small number of English words on the pages you already read with the Chinese you are studying. You keep reading; the vocabulary comes to you.

<b>How it works</b>
<ul>
<li>Pick an HSK level — HSK 3.0 (2021) or HSK 2.0 (1–6). Everything below it is treated as known.</li>
<li>Words from the next level up are added a few at a time, at a pace you set.</li>
<li>They turn up in your ordinary reading until you mark them known.</li>
<li>Hover a word — or double-tap it on Android — for the reading, the meaning, and the English it replaced.</li>
</ul>

Pinyin stays off the page by default: the reading lives in the popover, which is where you look once recall has already failed. You can put it above every substituted word instead, or hide it entirely.

<b>Everything happens on your device.</b> The dictionary ships inside the add-on, the substitution is worked out locally, and no page content is ever sent anywhere. An account is optional: it syncs your level and your word list between browsers, and without one Sparkle behaves exactly the same.

How much Chinese appears is a five-position control in the toolbar popup, from Subtle to Immersive, and Sparkle can be switched off for one site or for all of them.

Word meanings are adapted from CC-CEDICT, under CC BY-SA 4.0.