Undetectable AI

• What it is: An AI humanizer plus bundled AI-content detector, with a Chrome extension and API.
• Best for: Marketers, SEO writers and non-native English speakers who want AI drafts to read more naturally.
• Standout: The humanizer and a multi-detector checker live in one tool, so you rewrite and re-test in a single loop.
• Pricing: 250-word free trial, then word-budget plans from roughly $10/mo (lower with annual billing) up to custom volume.
• Rivals: Humbot, StealthGPT, QuillBot.

What is Undetectable AI?

Undetectable AI is a web app that does two related jobs. First, its humanizer rewrites AI-generated text so it reads more like natural human writing, smoothing out the repetitive phrasing and predictable sentence rhythm that large language models tend to produce. Second, it bundles an AI-content detector that runs your text through several popular detection engines at once, so you can see an aggregate read on how machine-written the output looks before you publish.

You paste up to a few thousand characters per run, choose a readability level (broadly a more-readable versus more-human trade-off) and a writing style such as essay, marketing, business or general, then humanize. Beyond the core editor there is a Chrome extension that humanizes text inline on sites like Gmail, Google Docs, Notion and LinkedIn, plus an API for teams that want to wire humanization or detection into their own apps. It supports 50+ languages, which makes it especially appealing to non-native English writers polishing AI drafts.

Key features

Undetectable AI pricing explained

Undetectable AI sells word budgets rather than seats. A free trial gives you a small allowance (around 250 words) to test humanization and detection before committing. Paid plans are tiered by monthly word volume, and at the time of writing the entry plan covers roughly 10,000 words a month, with larger tiers for 20,000 and 35,000 words; annual billing roughly halves the effective monthly rate. Business and bulk buyers can get custom, non-expiring word credits. Pricing and word allowances change, so confirm the current tiers and limits at signup.

Undetectable AI vs Humbot vs StealthGPT vs QuillBot

Is Undetectable AI worth it?

For polishing AI-assisted marketing copy, blog drafts or non-native English writing, Undetectable AI earns its place: the humanizer noticeably softens robotic phrasing, and having a multi-engine detector in the same window tightens the rewrite-and-check loop. The honest caveats are real, though. Output quality and detector results vary by content type and length, longer passages can pick up awkward phrasing, and no humanizer can guarantee a piece will pass any given detector. More importantly, using a tool like this to pass off AI work as your own in academic or graded settings is an integrity risk that sits entirely with you — many institutions explicitly prohibit it. Treat it as an editing and tone-tuning aid for content you are allowed to publish, lean on the free trial first, and our verdict is a qualified wait-and-test rather than an unconditional buy.