Why people go looking for an alternative
Undetectable.ai does one job: you paste AI text, it returns a rewrite. What it does not give you is evidence. You get the output and you decide, on faith, whether to submit it.
That gap is the whole reason HumanizeAI shows a score. Every rewrite comes back with a 0-to-100 AI-detection score from our own detector, plus a breakdown of the three signals detectors weigh hardest: burstiness (sentence-length variation), vocabulary variance, and perplexity. If the rewrite is not there yet, the breakdown tells you which signal is dragging and you iterate. No guessing at the submit button.
On June 11, 2026 we ran three ChatGPT-style passages through HumanizeAI on balanced mode and scored them with our own detector: an academic essay paragraph (137 words) went 99 to 1, a blog intro (99 words) went 99 to 15, and a marketing email (102 words) went 99 to 14. All three flipped from likely AI to likely human in one pass. Those numbers are ours, from our detector, on our scale; the limitations section below spells out exactly what they do and do not prove.
Who should pick HumanizeAI
Pick HumanizeAI if any of these describes you:
- You want proof, not vibes. The live score and three-signal breakdown appear on every rewrite, so you can verify before you submit and rerun the one paragraph that still scores high.
- You want a real free tier. 3 anonymous uses per day with no account, or 150 uses per month with a free account and no credit card.
- You want one subscription, not four. Pro at $19/month includes 3,000 humanizer uses plus the grammar checker, plagiarism checker, and citation generator, and adds Frozen Keywords (lock terms so rewrites never touch them) and Writing Style (rewrites that match a sample of your own writing).
- You work iteratively. The chat-based workspace keeps your drafts, scores, and rewrites in one thread instead of a paste-in, paste-out form.
Who should pick Undetectable.ai
An honest comparison page has to include this section, so here it is.
- You want a single-purpose tool. Undetectable.ai humanizes text and does nothing else. If you have no use for grammar checking, plagiarism scanning, or citations, a focused tool with a smaller interface may suit you better.
- You value track record. Undetectable.ai is one of the earliest and best-known names in this niche, with years of public usage behind it. HumanizeAI is newer; we earn trust by publishing our test data and methods rather than by tenure.
- Your workflow is already built around it. If you have prompts, processes, or team habits tuned to their tool and it is delivering, switching costs are real and we will not pretend otherwise.
Pricing, side by side, without games
Our numbers, exactly:
- Free, no account: 3 tool uses per day.
- Free account: 150 uses per month, no credit card.
- Pro: $19/month, 3,000 uses, Frozen Keywords, Writing Style.
- Business: $49/month, 10,000 uses.
- Enterprise: $199/month, 100,000 uses.
All paid tiers include the grammar, plagiarism, and citation tools. Cancel anytime; the free tier never silently converts to paid.
Undetectable.ai prices by word volume on its own plan structure, and their numbers change; quoting them here would mean publishing stale prices under a competitor's name. Check their pricing page for current figures and compare against the numbers above.
What this comparison is not (limitations)
Three honest limits on everything above.
First: we have not run Undetectable.ai through our benchmark. The June 2026 scores describe HumanizeAI only. We never publish competitor benchmark results we did not run, so this page makes no claim about how their output scores; our testing rules are documented on our methodology page at humanizeai.chat/methodology.
Second: our scores come from our own detector. External detectors such as GPTZero, Turnitin, and Originality.ai use different models and will score the same text differently.
Third: no humanizer, ours included, passes every detector every time. Detectors retrain constantly. The live score exists because the result cannot be promised in advance, only checked.
Frequently Asked Questions
Is HumanizeAI a good alternative to Undetectable AI?
It depends on what you need. HumanizeAI shows a live AI-detection score with a burstiness, vocabulary, and perplexity breakdown on every rewrite, includes grammar, plagiarism, and citation tools, and gives 150 free uses a month. Undetectable.ai is a focused single-purpose humanizer with a longer track record. If you want evidence and iteration, pick HumanizeAI; if you want one tool that only humanizes, theirs is a fair choice.
Does HumanizeAI score better than Undetectable.ai on detectors?
We don't know, and we won't claim it. We have only benchmarked our own tool: on June 11, 2026, three AI passages went from 99 to 1, 15, and 14 on our detector after one balanced-mode pass. We never publish competitor results we didn't run ourselves.
Is there a free Undetectable AI alternative?
HumanizeAI's free tier is 3 anonymous uses per day with no account, or 150 uses per month with a free account and no credit card. That is enough to humanize and rescore roughly ten full essays a month.
Can I lock keywords so the rewrite doesn't change them?
Yes, on the Pro plan ($19/month). Frozen Keywords keeps terms like product names, citations, or technical vocabulary verbatim while the rest of the text is rewritten.
Try HumanizeAI free
3 anonymous tool uses per day, 150 per month with a free account, no credit card needed.
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