HumanizeAI and Undetectable AI both rewrite AI-generated text so it reads more naturally and is less likely to get flagged by AI detectors — but they back that promise differently. Undetectable AI offers a money-back guarantee if your text still gets flagged; HumanizeAI leans on a broader all-in-one toolkit (detector, plagiarism checker, grammar checker) bundled with the humanizer. Here's which one fits your workflow.
If you want a money-back guarantee and detection across text, image, voice, and video, go with Undetectable AI. If you want a more generous free plan and a bundled AI writer, plagiarism checker, and grammar checker alongside the humanizer, go with HumanizeAI.
| Tool | Starting Price | Free Plan | Best Feature | Best For |
|---|---|---|---|---|
| HumanizeAI | $14/mo (Essential) | 1,500 words/mo | Bundled AI writer, detector, plagiarism & grammar checker | Writers wanting an all-in-one content toolkit |
| Undetectable AI | $5/mo (10K Plan) | 250 words (trial only) | Money-back guarantee if output is still flagged | Anyone who needs detection confidence, not just a rewrite |
Price: Free (1,500 words/mo) → $14/mo Essential → $24/mo Standard → $59/mo Pro. Best for: Content creators, SEO professionals, researchers, and marketers who want AI-assisted drafts to read more naturally before publishing.
Price: Free trial (250 words) → $5/mo 10K Plan → $9.50/mo 20K → $15.75/mo 35K → $21.25/mo 50K → custom Business. Best for: Content marketers and non-native English writers who need AI-assisted writing to reliably pass AI-detection checks.
Undetectable AI's money-back guarantee if humanized text is still flagged is a concrete confidence signal that HumanizeAI doesn't explicitly offer — worth weighing if passing detection reliably matters more to you than price.
Undetectable AI detects AI-generated images, voice, and video/deepfakes in addition to text, plus niche tools like fake ID and document detection. HumanizeAI stays focused on text: humanizing, detecting, checking plagiarism, and grammar — a tighter, writing-specific toolkit rather than a broad multi-format detector.
HumanizeAI's free plan is meaningfully more usable — 1,500 words/month versus Undetectable AI's one-time 250-word trial. If you want to test the workflow repeatedly before committing, HumanizeAI gives more room to do that for free.
HumanizeAI adds an AI writer, plagiarism checker, and grammar checker under the same word allowance. Undetectable AI adds a paraphrasing tool, AI essay writer, watermark remover, and (on Business plans) white-labeling and non-expiring credits — a different bundle aimed more at agencies and resellers.
Undetectable AI is notably cheaper per word at the entry tier ($5/mo for 10,000 words vs. HumanizeAI's $14/mo for 30,000 words on Essential) — but HumanizeAI's higher tiers include unlimited paraphrasing modes and full API access starting at the same Essential level.
Pick Undetectable AI if a money-back guarantee and multi-format (text, image, voice, video) detection matter most, and you're comfortable with a short free trial. Pick HumanizeAI if you want a more generous free plan and a bundled writing toolkit (AI writer, plagiarism, grammar) alongside the humanizer.
StealthWriter is a third option in this space, built specifically around humanizing AI text with a built-in detector — worth comparing if neither HumanizeAI nor Undetectable AI is a perfect fit.
Which is cheaper, HumanizeAI or Undetectable AI? Undetectable AI is cheaper at the entry tier ($5/mo for 10,000 words) versus HumanizeAI's $14/mo Essential plan.
Which tool offers a money-back guarantee? Undetectable AI offers a money-back guarantee if your humanized text is still flagged as AI-generated.
Can either tool detect AI-generated images or video, not just text? Yes — Undetectable AI detects AI-generated images, voice, and video/deepfakes in addition to text. HumanizeAI is focused on text only.
Which has the better free plan? HumanizeAI, with 1,500 free words per month versus Undetectable AI's one-time 250-word trial.
Thomas
Founder
Thomas is the founder of AIPick.info and an avid AI enthusiast dedicated to testing and reviewing the latest tools. He believes technology should make life easier and more enjoyable for everyone. Beyond providing practical reviews, Thomas aims to build an uplifting space where AI feels accessible, delivering insights with energy, positivity, and a commitment to helping others innovate with a smile.
