Shortlist by what you need
Start here if you know why you are leaving Copyleaks.
Want the closest match?
Winston AIMost similar to Copyleaks in what it does, its category and its price.
Visit (opens Winston AI 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 the best rated?
GPTZeroRated 4.4 out of 5 in our review, against 4.2 for Copyleaks.
Visit (opens GPTZero in a new tab)
At a glance
Green means better than Copyleaks, red means worse. Prices are starting prices per month.
| Tool | Our rating | Starts at | Free plan | Best for | Compare |
|---|---|---|---|---|---|
 CopyleaksBaseline | 4.2 | $9.99/mo | Yes | Copyleaks scans text and images for plagiarism and AI-generated content across dozens of languages for schools and businesses. | |
| Winston AI | 3.5−0.7 | Free | Yes | AI content and image detection claimed accurate 99.98% of the time - sentence-level highlights, plagiarism checks, and deepfake detection in one report. | vs Copyleaks |
| GPTZero | 4.4+0.2 | $15/mo$5.01 more | Yes | An AI detector built at Princeton that identifies LLM-generated text and now backs Superhuman's authenticity tools | vs Copyleaks |
| Originality.AI | 4.5+0.3 | $12.95/mo$2.96 more | Yes | An AI and plagiarism detector built for publishers who need to verify content before it goes live | vs Copyleaks |
 GPTKit | 3.3−0.9 | Free | Yes | Six AI detection techniques, trained on a million-document dataset, flag ChatGPT-written text with about 93% accuracy across 100,000+ tested responses. | vs Copyleaks |
 Undetectable AI | 3.2−1.0 | Free | Yes | Detects AI content across text, image, audio and video, and also rewrites text to evade detection. | vs Copyleaks |
 ZeroGPT.cc | 2.9−1.3 | Free | Yes | Paste text, get sentence-by-sentence AI-detection with color-coded highlighting - free, unlimited checks against GPT, Claude, Gemini, and more, no relation to zerogpt.com. | vs Copyleaks |
 ZeroGPT | 3.5−0.7 | Free | Yes | AI detection across text, image and video, with sentence-level highlighting. | vs Copyleaks |
 WriterBuddy | 3.7−0.5 | Free | Yes | 40+ academic writing tools in one place - co-writer, plagiarism checker, citation generator (MLA/APA/Chicago), ChatPDF - across 25+ languages. | vs Copyleaks |
The alternatives in detail
In order of how closely each one matches Copyleaks.
Winston AI
3.5Free
vs Copyleaks−0.7
AI content and image detection claimed accurate 99.98% of the time - sentence-level highlights, plagiarism checks, and deepfake detection in one report.
- AI text detection claimed 99.98% accurate across major LLMs
- AI-generated image and deepfake detection
- Plagiarism checking alongside AI detection
Free tier available with no credit card required
Paid tier pricing isn't shown on the homepage
GPTZero
4.4$15/mo
vs Copyleaks$5.01 more+0.2
An AI detector built at Princeton that identifies LLM-generated text and now backs Superhuman's authenticity tools.
- AI-generated text detection across ChatGPT, Claude, Gemini, and other major LLMs
- Plagiarism detection bundled alongside AI detection in the same scan
- Hallucination detection that flags unsupported or fabricated claims in a document
One of the most established and widely recognized names in AI detection, with a large existing user base
AI detection as a category carries an inherent false-positive risk on any tool, including this one
Originality.AI
4.5$12.95/mo
vs Copyleaks$2.96 more+0.3
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
GPTKit
3.3Free
vs Copyleaks−0.9
Six AI detection techniques, trained on a million-document dataset, flag ChatGPT-written text with about 93% accuracy across 100,000+ tested responses.
- Six different AI-based content detection techniques combined
- Trained on 1 million datasets, benchmarked on 100,000+ real responses (~93% accuracy)
- File upload support for bulk checking
Multi-method detection approach rather than a single scoring model
English only - no multilingual detection support
Undetectable AI
3.2Free
vs Copyleaks−1.0
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
ZeroGPT.cc
2.9Free
vs Copyleaks−1.3
Paste text, get sentence-by-sentence AI-detection with color-coded highlighting - free, unlimited checks against GPT, Claude, Gemini, and more, no relation to zerogpt.com.
- Sentence-by-sentence AI-detection with color-coded highlighting
- Readability scoring alongside detection
- Multi-model detection - GPT, Claude, Gemini, and more
Genuinely free and unlimited, no paywall on core detection
AI-detection accuracy is inherently imperfect and improves-then-degrades as generative models evolve
ZeroGPT
3.5Free
vs Copyleaks−0.7
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
WriterBuddy
3.7Free
vs Copyleaks−0.5
40+ academic writing tools in one place - co-writer, plagiarism checker, citation generator (MLA/APA/Chicago), ChatPDF - across 25+ languages.
- Co-Writer: brainstorming, autocomplete, grammar checking
- Citation generator: MLA, APA, Chicago formats
- Plagiarism checker and AI content detector
Covers the full academic writing workflow, not just drafting
40+ tools means real exploration to find the right one for a task
FAQ
Questions people ask
Is Copyleaks free?
Copyleaks has a free plan, and paid plans start from $9.99/mo.
What is the best free alternative to Copyleaks?
Originality.AI is the highest-rated alternative here with a free plan (4.5 out of 5). Other free options: GPTZero, WriterBuddy, Winston AI.
What is the cheapest alternative to Copyleaks?
Among paid plans, Originality.AI has the lowest starting price (from $12.95/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.