humanflow

HumanFlow vs Undetectable.ai

Undetectable.ai is cheaper. HumanFlow gives more words and a far larger free plan. If price is the deciding factor, pick Undetectable.ai. If you work on long documents or want to try a tool properly before paying, pick HumanFlow. Neither of us can honestly promise you a detection result.

Figures read from each vendor's own pricing page on 27 July 2026

Entry plan, side by side

 HumanFlowUndetectable.ai
Monthly$18$9.99
Yearly, per month$10.80$5
Allowance25,000 words / mo10,000 words / month
Per request5,000 wordsNo stated per-request cap
Free plan2,000 words / mo250-word trial
Free, per scan1,500 words250 words

What Undetectable.ai does better

  • Cheapest annual entry in the category at $60/year — we are $129.60
  • Chrome extension, which we do not have
  • AI image detection and a PDF checker
  • Public API
  • Runs in a browser on any device

We put this section first on purpose. A comparison page written by one of the two products is worth reading only if it is willing to lose.

What HumanFlow does better

  • Free plan handles a 1,500-word essay in one scan against their 250-word trial
  • Free plan is ongoing rather than a one-time trial
  • Sentence-level detection view rather than a single document score
  • We publish the research on detector accuracy, including where it undercuts our own category

What we will not compare

Which tool is better at getting past a detector. There is no reproducible public benchmark for it, detectors disagree with each other on identical text, and every vendor publishing such a number is grading its own homework — us included.

Everything above is a figure you can open their pricing page and check. That is the whole standard. Why detection scores are unreliable in the first place.

Which should you pick?

Pick Undetectable.ai if you want the lowest annual price, need a browser extension, or need to check images and PDFs as well as text.

Pick HumanFlow if you want a free plan you can actually finish an essay on, and a tool that tells you what detection scores really mean instead of promising to beat them.

One caveat that applies whichever you choose: HumanFlow is an Android app. Every competitor on this page runs in a browser. If you work on a desktop, that is a real reason to choose them today.

Common questions

Is HumanFlow cheaper than Undetectable.ai?
No. Undetectable.ai's entry plan is $9.99 a month or $5 billed yearly, against HumanFlow's $18 a month. We are more expensive at the door. Where we differ is volume — 25,000 words a month against their 10,000 words / month — and the free plan, which takes a full 1,500-word essay in one scan.
Which has the better free plan?
HumanFlow's free plan allows 2,000 humanizer words a month with up to 1,500 words in a single scan. Undetectable.ai's free tier is 250-word trial, capped at 250 words per request. The per-scan number matters most: a standard undergraduate essay is about 1,500 words.
Which one is better at avoiding AI detection?
We do not publish an answer to that, and we would treat anyone else's answer with caution. There is no reproducible public benchmark for humanizer output against detectors, detectors disagree with each other on identical text, and every vendor grading its own homework has an obvious interest. We compare on price, allowances and features because those can be checked.

Other comparisons

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