AI draft
This experiment serves as a crucial demonstration of how temperature influences reaction rate. Additionally, the tablet dissolved in 42 seconds at 40 °C and 95 seconds at 20 °C (Lab Manual, p. 14).
HumanGPT vs QuillBot: humanizer, pricing and privacy compared
QuillBot's Premium plan includes a paraphraser, grammar and plagiarism checkers, an AI detector, an AI humanizer and a summarizer.1 HumanGPT is an iPhone app for one of those jobs: it rewrites AI drafts so they sound like you, then checks facts, numbers and citations. Below, we compare platforms, limits, prices and data use, with a source for each claim about QuillBot.
The short verdict
QuillBot covers more writing jobs on more devices. HumanGPT focuses on humanizing, on iPhone.
Choose HumanGPT if…
- You write on an iPhone and often start from a photo, a scan or a web link.
- You want each rewrite checked for changed facts, numbers and citations.
- You only need a humanizer: Pro is $39.99 a year, against $99.99 for QuillBot's annual plan in the US App Store, which covers its whole suite with no humanizer word limit.23
HumanGPT vs QuillBot at a glance
Small numbers link to the sources at the end.
| Feature | HumanGPT | QuillBot |
|---|---|---|
| Platforms | iPhone app (iOS 17 or later). A web editor is planned but not live yet. | Web, Chrome, Edge and Safari extensions, Windows and macOS apps, a Word add-in and Android.1 iPhone (iOS 16 or later).2 |
| Free plan | Yes 1 free demo rewrite, then 300 words a day, up to 300 words per rewrite. | Yes Paraphrase or humanize up to 100 words.1 AI Detector: 1,200 words a scan, 6 scans a day.4 |
| Paid pricing | Pro: $5.99 a week with a 3-day free trial, or $39.99 a year (US prices).8 | Web: €19.95 a month, or €8.33 a month billed annually (as shown in Spain).1 iPhone: $19.99 a month, $79.99 semi-annual, $99.99 a year (US).2 |
| Word limits | Free: 300 words a day. Pro: 50,000 words a week (fair use), up to 3,000 words per rewrite. | Free humanizer: up to 100 words, limited usage.1 Premium: "No word or usage limit".3 |
| 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. | Says it uses fine-tuned models trained on human writing. Basic humanizing on Free, Advanced on Premium.3 |
| AI-likeness or detection | Yes Built-in AI-likeness estimate with per-sentence highlights. An estimate, not proof of authorship. | Yes The humanizer shows a score QuillBot calls "a signal rather than a verdict".3 The AI Detector checks text line by line.4 |
| Facts and citations kept | Yes Integrity check for facts, numbers and citations, plus a fact-check pass when needed. | Not stated Says meaning is kept; no separate fact or citation check described.3 |
| 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. | Paraphraser: uploads such as DOCX or TXT, and an Export option; export formats not listed.5 |
| Languages | App in English, German, Spanish and French. | Humanizer: English (4 dialects), Spanish, German, French, Portuguese.3 Paraphraser: 23 languages.1 iPhone app: English only.2 |
| 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.9 | May use collected data, including your content, to train its AI models (not Team Plan inputs). Kept while your account is open plus "a commercially reasonable period".67 |
| Notable claims | Doesn't promise undetectable text or a pass on any detector or exam. | Says its humanizer "isn't a tool for evading AI detection".3 Claims "a 99% detection rate" for its detector, citing RAID. We haven't tested this.4 |
- 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 QuillBot is stronger
-
It's on more devices
QuillBot runs on the web, in Chrome, Edge and Safari, on Windows, Mac and Android, and inside Word.1 On Premium, its extension also works in ChatGPT and Gemini.3 HumanGPT is iPhone-only for now.
-
Many tools in one plan
Premium includes a paraphraser with 9 modes, plagiarism checks for 25,000 words a month, a summarizer and a translator for 40+ languages.1 HumanGPT focuses on humanizing.
-
No humanizer cap on Premium
QuillBot lists "No word or usage limit" for Premium humanizing.3 HumanGPT Pro allows 50,000 words a week (fair use) and 3,000 per rewrite.
-
A refund window and a Team Plan
QuillBot offers a 14-day money-back guarantee to new users who haven't had a refund before.1 The Team Plan adds admin tools, and QuillBot says it won't train its models on Team Plan text inputs.6
Where HumanGPT is different
-
Facts and numbers get checked
Each rewrite gets an integrity check for facts, numbers and citations, then a fact-check pass when needed. QuillBot's humanizer page doesn't describe a separate check.3
-
Start from a photo or a link
Scan a page with on-device OCR, or import a Google Doc, a web link or a .txt file; PDF and Word need Pro. QuillBot's help center describes uploading files such as DOCX or TXT to its Paraphraser,5 and its iPhone app's AI Chat accepts photos and PDFs.2
-
An app in four languages
The HumanGPT app is in English, German, Spanish and French. QuillBot's iPhone app lists English only.2
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".1011 You choose the tone, strength and text type, and Pro adds voice matching.
QuillBot describes humanizing as keeping your text largely the same while changing sentence structure, length and word choice to remove AI "tells", without changing the meaning.3
Example rewrite
Tone: academicThe experiment shows how temperature affects reaction rate: the tablet dissolved in 42 seconds at 40 °C and 95 seconds at 20 °C (Lab Manual, p. 14).
Fixed
- Avoiding is/are/has
- Overused AI words
- Inflated significance
Kept
- 42 and 95 seconds
- (Lab Manual, p. 14)
Sample text and rewrite written for this page to show typical edits. Results depend on your text and settings. We don't show QuillBot output, because one sample can't fairly represent another tool.
Pricing compared
QuillBot's price covers its whole suite. HumanGPT Pro's $5.99 a week comes to about $26 a month (4.33 weeks), more than QuillBot's $19.99 monthly iPhone plan. Yearly, it's $39.99 against $99.99.2
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.8
QuillBot
- Free
- €0 / monthHumanize up to 100 words, limited usage
- Premium, iPhone
- $19.99 / monthOr $79.99 semi-annual, or $99.99 a year
- Premium, web
- €19.95 / monthOr €8.33 a month billed annually
Web prices from QuillBot's Premium page, iPhone prices from the US App Store.12
Prices as listed in October 2026, before tax: US prices in dollars, QuillBot's web prices in euros as shown in Spain. Either provider can change them.
Questions about HumanGPT and QuillBot
Is HumanGPT an alternative to QuillBot?
For humanizing on an iPhone, it can be. Both rewrite AI drafts and rate how AI-like a text reads, and HumanGPT also checks facts, numbers and citations. For paraphrasing, plagiarism checks or work on a laptop, QuillBot covers more.
Is QuillBot's humanizer free, and what does Premium cost?
Free accounts can humanize up to 100 words, with limited usage. In the US App Store, QuillBot Premium is $19.99 a month or $99.99 a year. HumanGPT Pro is $5.99 a week or $39.99 a year (US prices). Prices change, so check both before you buy.
Can HumanGPT promise my text won't be flagged as AI?
No. No tool can promise how a detector, a teacher or an editor will judge a text, and HumanGPT doesn't try to. It rewrites your draft so it reads naturally and shows an AI-likeness estimate, which is an estimate and not a verdict. Follow the rules of your school or workplace.
Does QuillBot use my text to train its AI?
QuillBot's privacy policy says it may use the data it collects, including your content, to train its AI models, except Team Plan text inputs. HumanGPT processes your text only to produce your result, as its privacy policy explains.
Sources
All sources were last checked in October 2026.
- QuillBot Premium: plans, features and limits (opens in a new tab)
- Quillbot-AI Writing & Keyboard on the App Store (US) (opens in a new tab)
- QuillBot AI Humanizer and FAQ (opens in a new tab)
- QuillBot AI Detector and FAQ (opens in a new tab)
- QuillBot Help Center: How to use the QuillBot Paraphraser (opens in a new tab)
- QuillBot Privacy Policy (updated August 17, 2026) (opens in a new tab)
- QuillBot Help Center: What kinds of data are used to train your models? (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)
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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.