Writing unmistakably human

Flesh Index — the textual humanity meter. It doesn’t detect AI slop. It detects YOU.

Paste any text and get a Flesh Score — a human writing score based on human markers in text, voice, tone, language, and other signals of authentic human expression.

No rewriting. No grammar correction. Just diagnosis.

How Flesh Index works

1 Paste your text. Drop in any piece of writing — from a sentence to a full article.
2 Flesh Index reads the language. The writing tool analyzes patterns associated with human expression, including human markers, voice, tone, and emotional texture.
3 Get your Flesh Score. You receive a breakdown of the human signals found in your text.

What does Flesh Index actually measure?

Expression Human markers, Human voice
Language Voice, tone, Emotional texture
Authenticity Personal imprint, Narrative drift
Variation Linguistic variation

"Don't make your writing less human to pass a detector. Measure what makes it human instead."

Most AI detectors try to answer one question: "Does this text look like it was written by AI?"
Flesh Index asks a different question: "How much human presence is actually in this text?"

A free tool to check if your writing sounds human

Paste your text into Flesh Index and see what your language reveals. Whether you're checking an essay, article, email, story, post, or AI-assisted draft, Flesh Index helps you understand the human voice in your text.

What is Flesh Index?

Flesh Index is a textual humanity meter and writing authenticity tool that analyzes human presence in text.

What is a Flesh Score?

A Flesh Score is the human writing score generated by Flesh Index.

Is Flesh Index an AI detector?

No. AI detectors look for machine patterns. Flesh Index looks for human markers in text.

Can I use Flesh Index on AI-generated writing?

Yes. You can analyze any text. Flesh Index will show you the human signals present.

Does Flesh Index rewrite my text?

No. It reads and scores your writing. Your words stay yours.

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Copygut.com is a forever-free hub for knowledge in copywriting, content trends, and AI text-generation. We endorse human-driven context creation and advocate for responsible AI use.
🇸🇪 Operated from Stockholm, Sweden.

Privacy & Terms

Surprise! We don't have a wall of text here.

We don't track anyone or collect information, just like it should be.
But a word of warning: know that all text you paste into online checkers is never guaranteed not to spread. That is the magic and the downside of the internet.

If your information is stolen, it's likely because you used a plugin or service elsewhere. Or someone could be looking over your shoulder.

Good luck and stay safe.
— Copygut