Shortlist by what you need
Start here if you know why you are leaving GPTinf.
Want the closest match?
Humanize AI ProMost similar to GPTinf in what it does, its category and its price.
Visit (opens Humanize AI Pro in a new tab)Need a free plan?
ProofWrite AIHas a free plan, rated 3.9 out of 5. GPTinf has none.
Visit (opens ProofWrite AI in a new tab)Want to pay less than GPTinf?
WriteHumanFrom $12/mo, against from $19/mo for GPTinf.
Visit (opens WriteHuman in a new tab)Want the best rated?
Netus AIRated 3.6 out of 5 in our review, against 3.5 for GPTinf.
Visit (opens Netus AI in a new tab)
At a glance
Green means better than GPTinf, red means worse. Prices are starting prices per month.
| Tool | Our rating | Starts at | Free plan | Best for | Compare |
|---|---|---|---|---|---|
 GPTinfBaseline | 3.5 | $19/mo | No | A paraphrasing engine that rewrites AI-generated text to read as human-written. | |
| Humanize AI Pro | 3.6+0.1 | $4.99/mo$14.01 less | YesGPTinf has none | Rewrites AI-generated text into human-sounding prose that preserves SEO value. | vs GPTinf |
| ProofWrite AI | 3.9+0.4 | $9.99/mo$9.01 less | YesGPTinf has none | Rewrites AI text and checks it against seven detectors, all in one pass | vs GPTinf |
 Undetectable AI | 3.2−0.3 | Free | YesGPTinf has none | Detects AI content across text, image, audio and video, and also rewrites text to evade detection. | vs GPTinf |
 JustDone | 2.7−0.8 | Not listed | No | Eleven student writing tools, two of which cancel each other out. | vs GPTinf |
| WriteHuman | 3.7+0.2 | $12/mo$7 less | No | WriteHuman rewrites AI-generated text to read as human-written and pass leading AI detectors. | vs GPTinf |
 Charley AI | 2.7−0.8 | Free | YesGPTinf has none | AI writing companion for students - essay generation, citation finding, lecture summarization and style matching, used by 550,000+ students. Also pairs a plagiarism detector with plagiarism removal. | vs GPTinf |
 StealthWriter | 2.9−0.6 | $20/mo$1 more | YesGPTinf has none | Rewrites AI-generated text to defeat AI detectors, and ships a detector to check the result. | vs GPTinf |
| Netus AI | 3.6+0.1 | $30/mo$11 more | YesGPTinf has none | AI paraphrasing and humanizing tool that rewrites text to read as human-written and pass AI detection. | vs GPTinf |
The alternatives in detail
In order of how closely each one matches GPTinf.
Humanize AI Pro
3.6$4.99/mo
vs GPTinf$14.01 less+0.1Free plan
Rewrites AI-generated text into human-sounding prose that preserves SEO value.
- Rewrites AI-generated text to reduce detectable machine-writing patterns while preserving original meaning
- Multiple humanization modes and settings across paid tiers
- Free tier for testing before upgrading to a word-volume plan
Entry paid tier at $4.99/month undercuts most competitors in the crowded AI-humanizer category
Operates in an extremely crowded, look-alike market (Humanize AI, HumanizeAI.io, AI Humanize, Humanizer Pro) that makes brand differentiation hard to verify
ProofWrite AI
3.9$9.99/mo
vs GPTinf$9.01 less+0.4Free plan
Rewrites AI text and checks it against seven detectors, all in one pass.
- Built-in verification against named AI detectors including Turnitin, GPTZero, and Copyleaks
- Eight distinct writing modes tuned to context, including Academic, Formal, and Blog
- Meaning-preservation keeping original facts and citations intact
Detector verification built into the same workflow, not a separate tool
More words per month require a paid plan
Undetectable AI
3.2Free
vs GPTinf−0.3Free plan
Detects AI content across text, image, audio and video, and also rewrites text to evade detection.
- AI text detection with flagged sections
- Image, audio and video AI detection
- Fake PDF detector
Detection across image, audio and video, not just text
Ships a humanizer for evading detection, with students among named users
JustDone
2.7Not listed
vs GPTinf−0.8
Eleven student writing tools, two of which cancel each other out.
- Plagiarism checker and citation generator
- Summariser, paraphraser and grammar checker
- AI chat that reads PDFs and websites
Most of the toolkit is ordinary, useful study software
Ships an AI humanizer beside an AI detector, defeating both
WriteHuman
3.7$12/mo
vs GPTinf$7 less+0.2
WriteHuman rewrites AI-generated text to read as human-written and pass leading AI detectors.
- Sentence-level rewriting rather than word-for-word substitution
- Built-in AI-detection scoring before and after humanizing
- Published HumanizerBench comparing bypass rates against competitors
Publishes benchmarked bypass-rate comparisons instead of only self-reported claims
No persistent free plan, only a time-limited trial
Charley AI
2.7Free
vs GPTinf−0.8Free plan
AI writing companion for students - essay generation, citation finding, lecture summarization and style matching, used by 550,000+ students. Also pairs a plagiarism detector with plagiarism removal.
- AI essay generation and expansion
- Automatic citation generation
- Lecture and video summarization
Citation generation and lecture summarization are genuine, uncontroversial study aids
Pairs a plagiarism detector with plagiarism removal in the same product - a self-defeating combination
StealthWriter
2.9$20/mo
vs GPTinf$1 more−0.6Free plan
Rewrites AI-generated text to defeat AI detectors, and ships a detector to check the result.
- AI humanizer with light, medium and aggressive modes
- Bundled AI detector to verify the output
- Deep Scan sentence-by-sentence analysis
Sentence-level control rather than one blanket rewrite
Its purpose is defeating detection, and students are the first audience named
Netus AI
3.6$30/mo
vs GPTinf$11 more+0.1Free plan
AI paraphrasing and humanizing tool that rewrites text to read as human-written and pass AI detection.
- AI Detection Bypasser that rewrites flagged text to read as human-written
- Paraphrasing engine covering 36 languages with adjustable tone and style
- Built-in AI content detector for checking text before publishing
Free Starter tier lets new users test output quality before paying
Reported team size is tiny (around one employee), raising questions about long-term support capacity
FAQ
Questions people ask
Is GPTinf free?
GPTinf does not list a free plan. Paid plans start from $19/mo.
What is the best free alternative to GPTinf?
ProofWrite AI is the highest-rated alternative here with a free plan (3.9 out of 5). Other free options: Humanize AI Pro, Netus AI, Undetectable AI.
What is the cheapest alternative to GPTinf?
Among paid plans, Humanize AI Pro has the lowest starting price (from $4.99/mo). If you need it free, start with ProofWrite AI.
How did you pick these alternatives?
We match tools on what they do, their category and their price, using the details in our directory. Ratings come from our reviews and reader reviews.