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Highlight some text, and detected grammar points will appear below.

Full list:

Note: the results include some false positives, so please use your own discretion.

The list of grammar rules has been collected from Korean Grammar in Use, https://www.howtostudykorean.com/, https://koreanwikiproject.com, and others. The list is frequently updated. If you find a grammar rule that is missing, please send an email to readerwebsite@gmail.com

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Writing in the main text area is now enabled.

List of unknown words from the current text.

List of known words from the current text.

List of learning words from the current text.

List of all words from the current text.

A complete list of collected vocabulary items.

To delete entries, select rows then press DEL key.


Deletes all words that are present in the current text from vocabulary.

Deletes all words from vocabulary.

See how one's vocabulary compares with past TOPIK papers.

List of vocabulary milestones.

List of sentences.

n: number of words in the sentence.
?: number of 'learning' or 'unknown' words in the sentence.
%: the percentage of 'learning' or 'unknown' words in the sentence.


Usage Guide

Paste a text in the text area. All new words start as unknown (unless you change this in settings). Click to mark them as learning, and again to mark them as known.

Suggested Interpretations:

    Unknown words may be unknown, difficult, or not important to remember for the timebeing.

    Learning words are words that feel fuzzy. The meaning can be guessed without confidence and perhaps needs to be confirmed with a dictionary lookup.

    Known words are words where the meaning is known instantly and accurately.

Data will be saved in the browser's local folder. Logging-in is recommended in order to save your accumulated vocabulary online.

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Unknown Words Highlight Colour:

Learning Words Highlight Colour: 

Known Words Highlight Colour:    

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All new words are initially marked:

Changes how words encountered for the first time will be initially marked. Words previously encountered will not be altered - to acheive this consider clearing vocabulary.

Deletes all words that are present in the current text from vocabulary.

Deletes all words from vocabulary.

Clear [ESC]
Dictionary [1]
Writing [2]
Statistics [3]
Grammar [g]