Corpus Analysis

Analyze your Japanese texts to discover difficulty patterns, grammar usage, and vocabulary insights.

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Insights

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Analysis Options

Focus on Japanese words only Skip punctuation marks Ignore particles and auxiliaries Ignore proper nouns Ignore numbers Ignore Katakana-only words

Your Documents

Analysis Results

Add documents and run analysis to see detailed results here.

Total Words

Unique Words

JLPT Level

–

Grammar

Your Learning Progress

Based on your known vocabulary

0 new words to learn

0 words you know

How to Read These Statistics

Each tab shows different aspects of your corpus. Look for info buttons (i) next to section titles for detailed explanations. Overview: JLPT levels and vocabulary complexity. Difficulty: Challenge scores and hardest content. Grammar: Patterns and structure analysis. Vocabulary: Coverage curves and lexical diversity.

JLPT Level Distribution

How your text breaks down by Japanese proficiency levels

Vocabulary Complexity

Distribution by word frequency and commonness

Grammar Structure

Breakdown by parts of speech: 名詞 (nouns), 動詞 (verbs), 形容詞 (adjectives), etc.

Difficulty Analysis

Estimated difficulty score (0-100) based on vocabulary and grammar complexity

Overall Difficulty –

Vocabulary –

Grammar –

Most Challenging

OOV: –

Sentences with highest estimated difficulty

Word Frequency Distribution

How rare or common your vocabulary is

Rare Words Found

Uncommon or specialized vocabulary in your text

Text Heatmap — JLPT

Visual highlighting of your text by JLPT difficulty levels

Level Distribution

OOV –

JLPT mix for planning level-appropriate content

Vocabulary Coverage

Share across frequency bands (TOP 1k/5k/10k…)

Grammar Density

Detected grammar patterns per 100 sentences

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Total patterns: –

Readability

Sentence length and lexical density

Avg Sent Len

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Lexical Density

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Novelty

New vs known unique words (if logged in)

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Known: –

Vocabulary Depth

Type richness and known-coverage

Types per 1k

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Known Coverage

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Structure & Register

Clauses per sentence and polite style ratio

Clause Density

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Polite Forms

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Furigana Needed

Share of tokens containing kanji

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Export Teacher Summary

Download a CSV snapshot of these metrics

Per-document Summary

Quick overview of level and grammar density per document

Top Grammar Patterns

Total: 0

Most frequently detected grammar constructions

Text Heatmap — Grammar

Visual highlighting of your text by detected grammar patterns

Grammar Flow

How different parts of speech connect in your text

Learning Coverage

How much you'd understand by learning the most common words first

X-axis: most frequent words learned →, Y-axis: coverage % ↑ (higher is better)

Vocabulary Diversity

How varied and rich your vocabulary usage is

Type-Token Ratio

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Higher = more variety

Moving Average TTR

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Smoothed diversity score

JLPT by Document

JLPT level breakdown for each document in your corpus

Common Phrases

Length:

Most frequent word sequences and collocations in your text

Corpus Statistics

Helpful aggregate measures for your corpus

Lexical Density

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Hapax Rate

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Avg Sentence Length

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Median Sentence Length

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Kanji Coverage

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Katakana Loanwords

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Character Composition

Share of character types across the entire corpus

Compare Two Corpora

Pick subsets of documents for A and B, then view JLPT, OOV, and grammar density side-by-side.

Group A

Group B

Run analysis first. Then select docs for each group.

JLPT Distribution

Group A

Group B

OOV Rate

Group A

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Group B

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Grammar Density

Detected patterns per 100 sentences

Group A

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Group B

–

Getting Started with Corpus Analysis

Add Japanese Content

Ready to Analyze

Analysis Options

Analysis filtering options

Your Documents

Analysis Results

Your Learning Progress

How to Read These Statistics

JLPT Level Distribution

Vocabulary Complexity

Grammar Structure