Shortlist by what you need
Start here if you know why you are leaving Plagiarism Checker X.
Want the closest match?
PlagiarismaMost similar to Plagiarism Checker X in what it does, its category and its price.
Visit (opens Plagiarisma in a new tab)Need a free plan?
Originality.AIHas a free plan, rated 4.5 out of 5.
Visit (opens Originality.AI in a new tab)Want to pay less than Plagiarism Checker X?
Conch AIFrom $9.99/mo, against from $39.95/mo for Plagiarism Checker X.
Visit (opens Conch AI in a new tab)Want the best rated?
Netus AIRated 3.6 out of 5 in our review, against 3.6 for Plagiarism Checker X.
Visit (opens Netus AI in a new tab)
At a glance
Green means better than Plagiarism Checker X, red means worse. Prices are starting prices per month.
| Tool | Our rating | Starts at | Free plan | Best for | Compare |
|---|---|---|---|---|---|
 Plagiarism Checker XBaseline | 3.6 | $39.95/mo | Yes | Windows desktop plagiarism checker that compares a document against billions of web pages and against other documents, with an AI Content Detector that indicates whether text came from an AI tool. | |
| Plagiarisma | 3.2−0.4 | Free | Yes | Free online plagiarism checker with an AI content detector, an AI paraphrasing tool and an AI essay writer. | vs Plagiarism Checker X |
| Netus AI | 3.6Same | $30/mo$9.95 less | Yes | AI paraphrasing and humanizing tool that rewrites text to read as human-written and pass AI detection. | vs Plagiarism Checker X |
 Undetectable AI | 3.2−0.4 | Free | Yes | Detects AI content across text, image, audio and video, and also rewrites text to evade detection. | vs Plagiarism Checker X |
 StealthWriter | 2.9−0.7 | $20/mo$19.95 less | Yes | Rewrites AI-generated text to defeat AI detectors, and ships a detector to check the result. | vs Plagiarism Checker X |
| Originality.AI | 4.5+0.9 | $12.95/mo$27 less | Yes | An AI and plagiarism detector built for publishers who need to verify content before it goes live | vs Plagiarism Checker X |
 GPTinf | 3.5−0.1 | $19/mo$20.95 less | No | A paraphrasing engine that rewrites AI-generated text to read as human-written. | vs Plagiarism Checker X |
 ZeroGPT | 3.5−0.1 | Free | Yes | AI detection across text, image and video, with sentence-level highlighting. | vs Plagiarism Checker X |
| Conch AI | 3.8+0.2 | $9.99/mo$29.96 less | Yes | Conch AI rewrites, summarizes, and cites text for students and researchers, and rephrases AI-generated writing to read as human-authored. | vs Plagiarism Checker X |
The alternatives in detail
In order of how closely each one matches Plagiarism Checker X.
Plagiarisma
3.2Free
vs Plagiarism Checker X−0.4
Free online plagiarism checker with an AI content detector, an AI paraphrasing tool and an AI essay writer.
- Plagiarism check against web sources, books and academic papers
- 190+ languages and uploads in a dozen file formats
- AI Content Detector for machine-written text
Free to use, with no paid plan shown on the pages reviewed
No model, limits or accuracy figures are given for the AI tools
Netus AI
3.6$30/mo
vs Plagiarism Checker X$9.95 lessSame
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
Undetectable AI
3.2Free
vs Plagiarism Checker X−0.4
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
StealthWriter
2.9$20/mo
vs Plagiarism Checker X$19.95 less−0.7
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
Originality.AI
4.5$12.95/mo
vs Plagiarism Checker X$27 less+0.9
An AI and plagiarism detector built for publishers who need to verify content before it goes live.
- AI content detection independently benchmarked for accuracy against competing detectors
- Live-web plagiarism checking rather than a static, outdated reference database
- Bundled fact-checking, grammar review, and readability scoring in the same platform
Accuracy claims are independently benchmarked rather than only self-reported
No unlimited free tier; the free AI checker is capped at a small word count
GPTinf
3.5$19/mo
vs Plagiarism Checker X$20.95 less−0.1
A paraphrasing engine that rewrites AI-generated text to read as human-written.
- Rewrites AI-generated text using a non-AI algorithm targeting perplexity and burstiness
- Eight distinct rewrite modes for different tone and style outcomes
- Built-in AI detector that scores text for AI-pattern probability
Addresses detection and rewriting in one interface instead of two separate tools
Independent tests have shown it failing to bypass detectors like GPTZero in some cases
ZeroGPT
3.5Free
vs Plagiarism Checker X−0.1
AI detection across text, image and video, with sentence-level highlighting.
- AI text detection with sentence-level highlighting
- DeepAnalyse multi-stage detection method
- AI image and video detectors
Sentence highlighting supports a conversation rather than an accusation
AI detection has a documented false-positive problem on non-native English
Conch AI
3.8$9.99/mo
vs Plagiarism Checker X$29.96 less+0.2
Conch AI rewrites, summarizes, and cites text for students and researchers, and rephrases AI-generated writing to read as human-authored.
- AI-generated text rewriting aimed at reducing AI-detector flags
- Research paper drafting and summarization assistant
- Flashcard and mind-map generation from uploaded notes or PDFs
Combines writing, studying, and citation tools instead of separate single-purpose apps
Rewrite/detection-evasion framing raises academic integrity concerns for classroom use
FAQ
Questions people ask
Is Plagiarism Checker X free?
Plagiarism Checker X has a free plan, and paid plans start from $39.95/mo.
What is the best free alternative to Plagiarism Checker X?
Originality.AI is the highest-rated alternative here with a free plan (4.5 out of 5). Other free options: Conch AI, Netus AI, ZeroGPT.
What is the cheapest alternative to Plagiarism Checker X?
Among paid plans, Conch AI has the lowest starting price (from $9.99/mo). If you need it free, start with Originality.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.