AI draft
I am thrilled to apply for the Marketing Coordinator role. Not only do I bring creativity, but I also bring results, growing our newsletter from 3,200 to 9,800 subscribers in 2025.
HumanGPT vs Undetectable AI: pricing, tools and privacy compared
Undetectable AI is a browser-based suite built around an AI humanizer and a free AI detector.1 HumanGPT is an iPhone app that rewrites AI drafts so they sound like you and shows an AI-likeness estimate for every sentence. This page compares their prices, limits, detection and privacy, with a source for each claim about Undetectable AI.
The short verdict
Both rewrite AI text. They differ most in where you work and how you pay.
Choose HumanGPT if…
- You write on an iPhone and import from photos, scans, Google Docs or web links.
- Names, numbers and citations must survive the rewrite, and you want them checked.
- You want a free daily allowance and one Pro plan, weekly or yearly.
HumanGPT vs Undetectable AI at a glance
Small numbers link to the sources below.
| Feature | HumanGPT | Undetectable AI |
|---|---|---|
| Platforms | iPhone app (iOS 17 or later). A web editor is planned but not live yet. | Web app, Chrome extension and API. We didn't find an iOS app on its site.123 |
| Free plan | Yes 1 free demo rewrite, then 300 words a day, up to 300 words per rewrite. | Yes Basic-model humanizer and AI detector. Paid models have a trial limited to 250 words.67 |
| Paid pricing | Pro: $5.99 a week with a 3-day free trial, or $39.99 a year (US prices).12 | Word plans from $5.00 a month billed yearly ($60.00), or from $19.00 on monthly billing.6 |
| Word limits | Free: 300 words a day. Pro: 50,000 words a week (fair use), up to 3,000 words per rewrite. | Plans from 10,000 words a month. Its humanizer page says one run takes up to 10,000 characters.67 |
| Rewriting approach | Anthropic Claude models guided by the open-source humanizer skill (26 patterns from Wikipedia's "Signs of AI writing"). Tones, strength, text types; voice matching and sentence rewrite on Pro. | Three models, plus readability, purpose and strength settings.7 |
| AI-likeness or detection | Yes Built-in AI-likeness estimate with per-sentence highlights. An estimate, not proof of authorship. | Yes Free detector that shows which sentences flag as AI.1 |
| Facts and citations kept | Yes Integrity check for facts, numbers and citations, plus a fact-check pass when needed. | Not stated We didn't find a fact or citation check.7 |
| Document import and export | Import .txt, photos and scans (on-device OCR), Google Docs and web links; PDF and Word on Pro. Export .txt, .docx, .pdf. | Partly Upload .txt, .pdf or .docx; copy the result. We didn't find a file export.17 |
| Languages | App in English, German, Spanish and French. | 50+ languages, with English as the main focus.5 |
| Privacy and data retention | Processed in the EU (Firebase europe-west1) and by Replicate (Anthropic Claude) only to produce results. Results kept 30 days; uploads deleted after extraction. No ads.13 | Its detector FAQ says text is "never stored or used to train models". Its privacy policy sets no fixed retention period for personal information.48 |
| Notable claims | Doesn't promise undetectable text or a pass on any detector or exam. | Lists "Passes AI detectors" as a plan feature, plus a money-back offer that its terms limit to output a reputable detector rates under 75% human. We haven't tested this.69 |
- Yes listed by the provider
- Partly some of it, or only on some plans
- No the provider says it isn't offered
- Not stated not in the sources we checked
Where Undetectable AI is stronger
Good reasons to pick Undetectable AI instead:
-
It runs in your browser
Undetectable AI works on the web and in Chrome, and it has an API from $29 a month.23 HumanGPT is an iPhone app until its planned web editor goes live.
-
A free detector, no account
Its AI detector is free, needs no sign-up and takes up to 10,000 words at once.4
-
More tools in one place
The site also lists a paraphraser, an essay writer, a plagiarism checker and detectors for images, voice and video.1 HumanGPT sticks to rewriting and checking text.
-
More languages and settings
Its humanizer and detector support 50+ languages, with English as the main one.5 The humanizer has five readability levels and nine purposes.7 HumanGPT's app interface is in four languages, and it has five tones.
Where HumanGPT is different
We didn't find these HumanGPT features in Undetectable AI's sources, or they work differently there.
-
Facts and citations checked
Each rewrite gets an integrity check for facts, numbers and citations, plus a separate fact-check pass when needed.
-
Photos in, files out
Scan a page with on-device OCR, or import a Google Doc or web link. Export to .txt, .docx or .pdf. Undetectable AI's Chrome extension can rewrite text from a screenshot.10
-
EU processing, fixed retention
Text is processed in the EU and by Replicate (Anthropic Claude) only to produce your result. Results are deleted after 30 days, uploads after extraction. No ads.13
How the rewriting differs
HumanGPT rewrites with Anthropic Claude models, guided by the open-source humanizer skill and its 26 patterns from Wikipedia's "Signs of AI writing".1415 You pick a tone, a strength and a text type.
Undetectable AI says it is building a model fine-tuned on consenting human writers, and that its humanizer checks output against its own detection models.11 Its Chrome extension has Light, Standard and Deep Rewrite modes.10
Example rewrite
Tone: professionalI'd like to apply for the Marketing Coordinator role. I'm creative, and I can show results: in 2025 I grew our newsletter from 3,200 to 9,800 subscribers.
Fixed
- Not X but Y
- Shallow -ing add-ons
- Sales language
Kept
- 3,200 to 9,800
- 2025
Sample text and rewrite written for this page to show typical edits. Results depend on your text and settings. We don't show Undetectable AI output, because one sample can't fairly represent another tool.
Pricing compared
Undetectable AI sells monthly word allowances, billed monthly or yearly.6 A year of HumanGPT Pro is $39.99 for 50,000 words a week (fair use); Undetectable AI's smallest yearly plan is $60.00 for 10,000 words a month.
HumanGPT
- Free
- $01 free demo rewrite, then 300 words a day, up to 300 per rewrite
- Pro weekly
- $5.99 / week3-day free trial. 50,000 words a week (fair use), up to 3,000 per rewrite
- Pro yearly
- $39.99 / yearSame Pro limits
US prices.12
Undetectable AI
- Free
- $0Basic-model humanizer and AI detector
- 10K words
- $5.00 / monthBilled yearly at $60.00
- 20K words
- $9.50 / monthBilled yearly at $114.00, or $19.00 monthly
- 50K+ words
- $21.25 / monthBilled yearly, or $42.00 monthly
- 80K+ words
- $64.00 / monthBilled monthly
Selected plans as listed on Undetectable AI's pricing page.6
Prices in US dollars as listed in October 2026, before tax. Prices in your country may differ, and either provider can change them at any time.
Questions about HumanGPT and Undetectable AI
Is HumanGPT an alternative to Undetectable AI?
For rewriting on an iPhone, yes. HumanGPT checks facts, numbers and citations after each rewrite, exports .docx and .pdf files and imports from photos or links. If you work on a laptop, or want a free detector with no sign-up, Undetectable AI may suit you better. HumanGPT's web editor isn't live yet.
How does Undetectable AI pricing compare with HumanGPT?
Undetectable AI's paid plans start at $5.00 a month, billed yearly at $60.00, for 10,000 words a month. HumanGPT is free for 300 words a day, and Pro is $5.99 a week with a 3-day free trial or $39.99 a year in the US. Prices change, so check both before you pay.
Can HumanGPT promise a detector won't flag my text?
No. No tool can promise how a detector, a teacher or an editor will judge a text, and HumanGPT doesn't claim to. Undetectable AI lists "Passes AI detectors" as a plan feature; we haven't tested that claim. HumanGPT's AI-likeness estimate is there to guide your edits. Follow the rules of your school or workplace.
What happens to my text in each tool?
HumanGPT processes text in the EU and through Replicate (Anthropic Claude) only to produce your result, keeps result copies for 30 days and deletes uploads after extraction. Undetectable AI's detector FAQ says text is never stored or used to train models; its privacy policy sets no fixed retention period.
Sources
All sources were last checked in October 2026.
- Undetectable AI home page (opens in a new tab)
- Undetectable AI Chrome extension page (opens in a new tab)
- Undetectable AI API plans (opens in a new tab)
- Undetectable AI detector and FAQ (opens in a new tab)
- Undetectable AI help page (opens in a new tab)
- Undetectable AI pricing (opens in a new tab)
- Undetectable AI humanizer and FAQ (opens in a new tab)
- Undetectable AI privacy policy (last updated 03/18/2023) (opens in a new tab)
- Undetectable AI terms (last updated 01/01/2025) (opens in a new tab)
- Undetectable AI: Your AI tool kit, Chrome Web Store listing (opens in a new tab)
- About Undetectable AI (opens in a new tab)
- HumanGPT pricing
- HumanGPT privacy policy
- humanizer, an open-source skill by Siqi Chen (MIT License) (opens in a new tab)
- Wikipedia: Signs of AI writing (opens in a new tab)
Other comparisons
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- HumanGPT vs BypassGPT Web humanizer with an AI checker
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- HumanGPT vs Walter Writes AI AI humanizer with a detector
- HumanGPT vs Clever AI Humanizer Free web humanizer
- HumanGPT vs ZeroGPT AI detector with writing tools
- HumanGPT vs GPTZero AI detector for educators
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- HumanGPT vs Grammarly Writing assistant with a humanizer
- All HumanGPT comparisons Overview of all 10 tools
Try HumanGPT on your next draft
Paste a paragraph, pick a tone and check the AI-likeness estimate. Your first rewrite is free.
For iPhone with iOS 17 or later.