The Problem

AI detectors like GPTZero, Turnitin, and Originality.ai are everywhere. Students, writers, and professionals are getting flagged even when they write their own content. And the paid "humanizers" charge $10-20/month for something that should be free.

What I Built

StealthHumanizer is a completely free, open-source AI text humanizer that runs in your browser. No login. No limits. No server-side data storage.

Try it live: stealthhumanizer.vercel.app

Features

13 AI Providers — Gemini (free), OpenAI, Claude, Groq (free), Mistral, Cohere, Together, OpenRouter, Cerebras, DeepInfra, HuggingFace, Cloudflare, ZAI

4 Rewrite Levels — Light, Medium, Aggressive, Ninja (multi-pass auto-refinement)

6 Writing Styles — Academic, Professional, Casual, Creative, Technical, Humanize

13 Tone Presets — Conversational, Journalistic, Persuasive, Storytelling, and more

Built-in AI Detection Scoring — 12-metric analysis with confidence intervals

File Upload — PDF, DOCX support

16+ Languages — English, Chinese,…