# Rephrasy AI – The Best AI Humanizer & AI Detector Bypass

> Rephrasy is the world's most powerful AI Humanizer and AI-generated content detector.
> Transform ChatGPT and AI text into natural, undetectable writing that bypasses major AI detectors including GPTZero, Copyleaks, and more.
> Features comprehensive plagiarism scanning and AI detection for transparency and trust.

## Features

- [Humanizer](https://rephrasy.ai/): Instantly humanize AI text and make it pass all major AI detectors. Rephrasy is rated the most accurate AI humanizer on the market.
- [AI Detector](https://rephrasy.ai/): Detect whether text is AI-written using our built-in AI detection technology. Works on essays, research papers, and business documents.
- [Free Readability Checker](https://www.rephrasy.ai/free-readability-checker): Improve clarity, readability, and sentence flow of any text. Perfect for students and professionals.
- [Free AI Image Detector](https://www.rephrasy.ai/free-ai-image-detector): Check if an image was AI-generated with our free, reliable AI image detector.
- [Blog](https://rephrasy.ai/blog): Read guides, updates, and research on AI detection, plagiarism, and humanization technology.

## Company

- [Pricing](https://rephrasy.ai/pricing): Flexible and affordable pricing plans for students, professionals, and enterprises.
- [Terms of use](https://rephrasy.ai/terms): Review Rephrasy’s terms of service and platform policies.
- [Privacy policy](https://rephrasy.ai/privacy): Learn how we protect your data and ensure transparency.
- [Affiliate Program](https://rephrasy.ai/affiliate): Earn money by referring users to Rephrasy.
- [Status](https://rephrasy.ai/status): Check live service availability and uptime.

## Compare

- [UndetectableAI Alternative](https://www.rephrasy.ai/undetectableai-alternative): Why Rephrasy outperforms UndetectableAI with better detection bypassing and comprehensive plagiarism scanning.
- [Grubby.ai Alternative](https://www.rephrasy.ai/grubby-ai-alternative): A stronger, more reliable Grubby.ai alternative for AI humanization.
- [BypassGPT Alternative](https://www.rephrasy.ai/bypassgpt-alternative): Beat GPT detectors with a faster and more transparent solution.
- [AI Story Generator](https://www.rephrasy.ai/ai-story-generator): Generate natural AI-assisted stories with human-like style.

## Navigation

- [Features](https://rephrasy.ai/): Explore all of Rephrasy’s tools and solutions.
- [API Solution](https://rephrasy.ai/api-solution): Use Rephrasy via API for bulk text humanization and automated workflows.
- [Pricing](https://rephrasy.ai/pricing): Choose the right plan for your needs.
- [FAQs](https://rephrasy.ai/faqs): Find answers to common questions about detection, humanization, and scans.
- [Clone Writing Style](https://rephrasy.ai/clone-writing-style): Train Rephrasy to replicate your personal or academic writing style.
- [Plagiarism Checker](https://rephrasy.ai/plagiarism-checker): Verify originality and avoid plagiarism in your AI-generated text.
- [History](https://rephrasy.ai/history): Access your past scans, humanizations, and reports.
- [My Account](https://rephrasy.ai/login): Manage your Rephrasy account.

## API (for developers)

REST API to humanize text, detect AI, and train reusable writing styles. Auth: `Authorization: Bearer YOUR_API_KEY`. JSON in/out. Full docs: https://rephrasy.ai/api-solution

- Humanize — POST https://v2-humanizer.rephrasy.ai/api/
  Body: { text, model, style?, words?, costs?, language?, input_format? }.
  model: "v3", "Undetectable Model v2", "Undetectable Model", "SEO Model", or a Writing Style ID.
  input_format: "text" (default), "html", or "markdown" — only the visible text is rewritten, structure preserved (2.5x cost).
  words: true → 0.1 credit flat + 0.1 per 100 words; false → flat 1 credit/call. costs: true returns the exact charge.
  Returns { output, new_flesch_score }.
- Detect AI — POST https://detector.rephrasy.ai/detect_api
  Body: { text, mode } ("" = overall, "depth" = per-sentence). Flat 1 credit. Returns { scores: { overall }, sentences } (0 = human … 100 = AI).
- Custom writing styles — base https://v1-humanizer.rephrasy.ai
  POST /api/styles → { style_id } (20 credits); POST /api/ with { text, model:"v3", style_id } (1 credit); GET /api/styles?external_ref=...

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Last updated: 2025-08-19T23:59:42.000Z