Zipf's Law Text Analyzer
Paste a text to get a rank–frequency chart on log-log axes, the slope, R² and a Zipf fit index, plus the words that appear noticeably more often than Zipf's law predicts.
How the numbers are calculated
- Words: runs of Cyrillic and Latin letters (hyphens and apostrophes inside are kept). Numbers and punctuation are dropped, case is ignored, Russian «ё» is treated as «е».
- Slope and R²: a linear regression on log(rank) vs log(frequency). Only words seen at least twice are used (or the top 50 words if fewer than 10 qualify): the tail of one-off words forms a flat “step” that would distort the slope.
- Index 0–100 = 60% × how close the slope is to −1 (1 at −1, 0 when off by 0.8 or more) + 40% × line fit (1 at R² = 1, 0 at R² ≤ 0.7). 80+ is a close fit, 60–79 moderate, below 60 weak.
- The “Zipf” column is the classic f₁ / rank, where f₁ is the count of the most frequent word; “Deviation” is the difference from it. The “above norm” mark is relative to your text’s own regression line instead, so a shallow or steep slope alone doesn’t turn every word into an outlier: the word is not a stop word, occurs at least 3 times and 1.5× more often than the line predicts. A rank-1 word is also marked when stop words are kept and it still outranks all of them: in natural text the top spots belong to articles, prepositions and conjunctions.
Fatos principais
Zipf’s law: in natural text a word’s frequency is roughly inversely proportional to its rank, and on a log-log chart this is almost a straight line with a slope near −1. Paste a text and the tool draws the chart, computes slope and R² and gives a fit index. It is statistics, not an AI detector: a short text, a list or mixed languages will deviate.
- Preço
- Grátis
- Cadastro
- Não é necessário
- Processamento
- No seu navegador — nada é enviado ao nosso servidor
- Entrada
- Text of 50 words up to 50,000 characters
- Limites
- No sign-up and no request limits; at least 50 words and at most 50,000 characters; estimates are unstable on texts under 300 words
- Resultado
- The slope and R² of the log-log line, a Zipf fit index from 0 to 100, a top-30 word table with frequencies and stop-word marks, a rank–frequency chart with the ideal line and a list of words more frequent than predicted
- Última atualização
Zipf's Law Text Analysis Online
Check a text against Zipf's law: the tool counts word frequencies, plots rank vs frequency on log-log axes next to the ideal Zipf line, computes the slope and R² of a linear regression and combines them into a 0–100 fit index. Words that appear noticeably more often than the text's own distribution predicts are highlighted, which helps spot keyword stuffing. Runs in your browser, no sign-up.
Como usar
- Paste a text — 300+ words, ideally 1,000+ (up to 50,000 characters)
- Optionally turn on stop-word removal and click “Analyze”
- Review the slope, R², the chart and the highlighted words in the table
FAQ
PromoPilot vs. alternativas: comparação
Comparamos apenas o que está confirmado nas páginas de cada serviço. Onde não conseguimos confirmar um dado, a célula mostra "—".
| Parâmetro | PromoPilot | Wikipedia: закон Ципфа (справка) |
|---|---|---|
| Rank–frequency chart with slope and R² | ✓ | Explains that a log-log plot shows how closely data follow the law; no tool |
| Fit index 0–100 | ✓ | ✗ |
| Words more frequent than expected | ✓ | ✗ |
| No text sent to a server | ✓ | — |
Role a tabela para os lados
Onde somos mais fracos: tokenisation is simple with no lemmatisation, up to 50,000 characters, no file upload or multi-text comparison, and the index is our own scale, not a standard metric.
Quando escolher o PromoPilot: When you want to see the word-frequency distribution of your own text in seconds, spot overused words and judge how natural the text looks. A single index is not enough to judge AI authorship or SEO text quality.
Verificado em: . "—" significa que não foi confirmado na página oficial; condições e preços mudam, então confira os sites dos próprios serviços.
RankBotAI — otimização de SEO com IA para WordPress
O plugin de IA RankBotAI encontra e corrige automaticamente problemas de SEO em produtos e posts do WordPress — sem edição manual.