What is the AI Detector?
The AI Detector from Humanizely is a free online tool that estimates how likely a piece of text is to be AI-generated in seconds. It scores each sentence individually, so you see exactly which lines to revise rather than a single opaque number. Instead of swapping words one at a time like older spinners, it reads each sentence in context, works out what you are trying to say, and rebuilds the sentence so it reads naturally while keeping your original meaning intact.
Because it runs in your browser and needs no account, you can paste a draft, get a result, and move on with your day. Students use it to polish assignments, marketers use it to refresh campaign copy, and professionals use it to make reports and emails sound clear and personal rather than robotic.
How the AI Detector works
Under the hood, the AI Detector combines a language model trained on a large body of human-written documents with a scoring layer that measures readability, rhythm, and predictability. When you press the main button, your text is split into sentences, each sentence is analyzed for tone and structure, and a new version is produced that keeps every key fact, name, and number from your draft.
The mode selector changes how strong the rewrite is. Lighter modes preserve more of your wording, while stronger modes restructure sentences more freely. After processing, the AI detection score bar shows how human the result reads, so you can decide whether to run it again or start editing by hand.
Who uses the AI Detector?
Teachers, editors, and writers use the AI Detector to check drafts before submitting or publishing them. Writers who work in a second language find it especially useful, because it turns grammatically correct but stiff sentences into the kind of phrasing a native speaker would naturally choose.
Teams also use it as a final pass before publishing. Running copy through the AI Detector catches repetitive sentence openings, overused transition words, and uniform sentence lengths, which are three of the most common signals that make writing feel automated to readers and detectors alike.
Tips for getting the best results
Start with a clean draft. The tool works best on complete sentences and paragraphs, so fix obvious factual errors before you paste. Process long documents in sections of a few hundred words, which keeps the context tight and makes reviewing the output faster.
Always read the result before you use it. The AI Detector is designed to save you time, not to replace your judgment. Add a personal example, a specific statistic, or an opinion only you could have, and the final piece will sound unmistakably like you.
Is it private and safe?
Yes. Text you paste is processed only to generate a result and is never published, sold, or added to a public database. The free version needs no sign-up, and Pro members can delete their history at any time from their dashboard.
We also encourage responsible use. Humanizely is built to improve clarity and voice. If your school or employer has rules about AI assistance, follow them and treat the tool the way you would treat a grammar checker or a thesaurus.
Free vs Pro
The free plan lets you process up to 500 words per request with the core modes, which is plenty for emails, short posts, and paragraph-level edits. If you write longer documents, Pro raises the allowance to 50,000 words per month, unlocks Academic mode, removes the output watermark, and gives you priority processing during busy hours.
Plans start at $9.99 per month, and yearly billing saves 40%. Whichever plan you choose, the AI Detector and the rest of the Humanizely toolkit stay in one place, so you can humanize, detect, paraphrase, summarize, and proofread without switching between apps.