# Metric37

> AI text humanization service that converts AI-generated text into natural, human-like prose.

Metric37 helps freelance writers, content agencies, and SEO teams transform AI-written content into authentic human writing that passes AI detection. Rewriting engine with automatic quality scoring, tone control, and version history.

## Core Product

- [AI Text Humanizer](https://metric37.com): Transform AI text into natural prose with scoring, iteration, and tone control
- [Free AI Detector](https://metric37.com/detect): Check if text is AI-generated (no account required)
- [Embeddable AI Detector Widget](https://metric37.com/embed/detect): Add AI detection to your website
- [API Documentation](https://metric37.com/api): Integrate AI humanization into your workflow

## Pricing

- Free: 1,500 words/month, no credit card required
- Starter: $9/month, 30,000 words
- Pro: $29/month, 100,000 words
- Agency: $79/month, 300,000 words

## How It Works

1. Paste AI-generated text into the editor
2. Click "Humanize" — engine rewrites with tone control
3. Automatic quality scoring (0-100 human score)
4. Iterate with "Try again" for different tones or further refinement
5. Track all versions with word-level diff comparison

## Key Features

- Rewriting engine (not single-pass paraphrasing)
- Automatic quality scoring — retries if score is too low
- Tone control (professional, conversational, academic, etc.)
- Version history with word-level diffs (up to 20 versions)
- API access with API keys for programmatic use
- Referral program with two-sided word bonuses

## Blog — Guides & Comparisons

- [Metric37 vs Undetectable AI vs QuillBot](https://metric37.com/blog/metric37-vs-undetectable-ai): Side-by-side comparison of top AI humanizers
- [Best AI Humanizer for SEO Content (2026)](https://metric37.com/blog/best-ai-humanizer-for-seo): Which humanizer improves search rankings
- [How to Edit ChatGPT Output to Sound Like You](https://metric37.com/blog/how-to-edit-chatgpt-output): Practical guide with before/after examples
- [Why Your AI Content Sounds Like Everyone Else's](https://metric37.com/blog/why-ai-content-sounds-the-same): Why AI writing converges and how to fix it
- [How AI Detection Actually Works](https://metric37.com/blog/how-ai-detection-works): Technical explainer — perplexity, burstiness, classifiers
- [Metric37 vs WriteHuman vs StealthWriter](https://metric37.com/blog/metric37-vs-writehuman-vs-stealthwriter): Detailed feature and quality comparison
- [Why One-Shot Humanization Fails](https://metric37.com/blog/why-one-shot-humanization-fails): Why iterative refinement beats single-pass
- [From 62 to 91: Real Text Refined in 5 Steps](https://metric37.com/blog/from-62-to-91-refine-in-5-steps): Step-by-step walkthrough with score progression
- [Version Trees for Text](https://metric37.com/blog/version-trees-for-text): Git-like branching for writing workflows
- [Best AI Humanizer for Freelance Writers (2026)](https://metric37.com/blog/best-ai-humanizer-for-freelancers): Comparison for professional writers
- [How Many Rewrites to Pass AI Detection? (Original Research)](https://metric37.com/blog/how-many-rewrites-to-pass-ai-detection): Data-driven analysis of iteration patterns from real platform data

## Comparisons

- [Metric37 vs Undetectable AI](https://metric37.com/compare/undetectable-ai): Feature and quality comparison
- [Metric37 vs QuillBot Humanizer](https://metric37.com/compare/quillbot-humanizer): LLM rewriting vs synonym swapping
- [Metric37 vs WriteHuman](https://metric37.com/compare/writehuman): Iterative vs single-pass comparison

## Is [AI Tool] Detectable?

- [Is ChatGPT Detectable?](https://metric37.com/detect/chatgpt): Detection patterns and accuracy rates for ChatGPT
- [Is Google Gemini Detectable?](https://metric37.com/detect/gemini): How Gemini output differs for detection
- [Is Claude Detectable?](https://metric37.com/detect/claude): Claude's unique detection patterns
- [Is Microsoft Copilot Detectable?](https://metric37.com/detect/copilot): Copilot uses GPT under the hood
- [Is Perplexity AI Detectable?](https://metric37.com/detect/perplexity): How RAG affects detectability

## How to Humanize [Content Type]

- [Humanize AI Essays](https://metric37.com/humanize/essays): Step-by-step guide for academic writing
- [Humanize AI Blog Posts](https://metric37.com/humanize/blog-posts): From AI draft to publishable content
- [Humanize AI Marketing Copy](https://metric37.com/humanize/marketing-copy): Authentic brand voice from AI drafts
- [Humanize AI Emails](https://metric37.com/humanize/emails): Professional without the robot voice

## Free Tools
- [Free AI Humanizer Preview](https://metric37.com/preview): Paste AI text, see it humanized side-by-side with AI scores. No signup required.
- [Free AI Detector](https://metric37.com/detect): Check if your text was written by AI. Powered by the scoring engine trusted by 2,400+ content teams.

## Company
- [About](https://metric37.com/about): Our mission, values, and team.
- [Security](https://metric37.com/security): How we protect your data. SOC 2, GDPR, encryption.
- [Status](https://metric37.com/status): Current system operational status.
- [Changelog](https://metric37.com/changelog): Product updates and new features.
- [Contact](https://metric37.com/contact): Get in touch with our team.

- Website: https://metric37.com
- Support: support@metric37.com
- Privacy Policy: https://metric37.com/privacy
- Terms of Service: https://metric37.com/terms