We've curated 45 of the best alternatives to Copyleaks - Plagiarism detector, ranked by feature overlap, topic similarity, user ratings, and popularity. Free AI Detector by ContentAtScale, Originality, and Copyleaks - AI content detector lead the list as the closest matches.
Updated May 18, 2026
The list includes 11 free alternatives, 12 freemium, 15 paid, and 7 with a free trial, so whether you're looking for a no-cost replacement or a more capable paid tier, there's an option to compare. Copyleaks - Plagiarism detector itself is paid, which makes paid alternatives the most natural starting point.
Many of these tools cluster around use cases like Content Verification, Text Analysis, Ai Detection, and Plagiarism Detection — the same problem spaces Copyleaks - Plagiarism detector addresses. Cross-referencing tools that overlap on multiple topics gives a more reliable signal than category alone, because two products in the same category can still serve very different workflows.
Our ranking weighs eight signals: shared category, topic overlap, feature overlap, name and description text similarity (via PostgreSQL's pg_trgm and tsvector), Bayesian-smoothed user ratings, pricing-model match, popularity, and editorial overrides. Scores are then normalized within each tool's own candidate pool so the top match always represents the strongest available alternative.
Use the table of contents below to jump to free or paid alternatives, or scroll down to compare each option side-by-side with Copyleaks - Plagiarism detector.
Ranked by compatibility score
Ai Content Detection
Detect AI-generated content with free online tool
Like Copyleaks - Plagiarism detector, Free AI Detector by ContentAtScale is in the Ai Content Detection category. Both are paid. Worth comparing on the detail page.
Ai Content Detection
11 free and 12 freemium options.
15 paid options.
21 additional candidates
Like Copyleaks - Plagiarism detector, Nuanced is in the Ai Content Detection category. Nuanced is free-trial, while Copyleaks - Plagiarism detector is paid. Worth comparing on the detail page.
Like Copyleaks - Plagiarism detector, Crossplag is in the Ai Content Detection category. Crossplag is freemium, while Copyleaks - Plagiarism detector is paid. Worth comparing on the detail page.
Free AI Detector by ContentAtScale ranks as the highest-scoring alternative to Copyleaks - Plagiarism detector, based on shared category, topic overlap, feature similarity, and user ratings. Ratings are still being collected for this tool.
Yes — 11 fully free and 12 freemium alternatives are available, including Winston AI, AI Detector, and ZeroGPT.
Free AI Detector by ContentAtScale is similarly priced (paid) and sits in the same category (Ai Content Detection). View its detail page to compare features, integrations, and reviews side-by-side.
Top Ai Content Detection alternatives include Free AI Detector by ContentAtScale, Originality, Copyleaks - AI content detector, and Plagium AI Detector. These tools share the same primary category and have meaningful topic overlap with Copyleaks - Plagiarism detector.
Checked content's originality & plagiarism.
Like Copyleaks - Plagiarism detector, Originality is in the Ai Content Detection category. Both are paid. Worth comparing on the detail page.
Ai Content Detection
Detect AI-generated content in 30 languages
Like Copyleaks - Plagiarism detector, Copyleaks - AI content detector is in the Ai Content Detection category. Both are paid. Worth comparing on the detail page.
Ai Content Detection
Detect plagiarism and AI-generated content quickly.
Like Copyleaks - Plagiarism detector, Plagium AI Detector is in the Ai Content Detection category. Both are paid. Worth comparing on the detail page.
Ai Content Detection
Spot AI-generated text in seconds.
Like Copyleaks - Plagiarism detector, AI Content Detector by Leap is in the Ai Content Detection category. Both are paid. Worth comparing on the detail page.
Ai Content Detection
Detect AI-generated content with precision
Like Copyleaks - Plagiarism detector, AI Detect is in the Ai Content Detection category. Both are paid. Worth comparing on the detail page.
Ai Content Detection
Detect AI-generated content with high accuracy.
Like Copyleaks - Plagiarism detector, AI Copy Scanner is in the Ai Content Detection category. Both are paid. Worth comparing on the detail page.
Ai Content Detection
Best AI detector and undetectable AI rewriter.
Like Copyleaks - Plagiarism detector, AI Undetect is in the Ai Content Detection category. Both are paid. Worth comparing on the detail page.
Ai Content Detection
Detect AI-generated text in a click.
Like Copyleaks - Plagiarism detector, GPT Radar is in the Ai Content Detection category. Both are paid. Worth comparing on the detail page.
Ai Content Detection
Bypass AI detectors with undetectable AI writing
Like Copyleaks - Plagiarism detector, AI Undetect is in the Ai Content Detection category. Both are paid. Worth comparing on the detail page.
Ai Content Detection
Unmask AI-generated tweets instantly
Like Copyleaks - Plagiarism detector, TweetDetective is in the Ai Content Detection category. Both are paid. Worth comparing on the detail page.
Ai Content Detection
Instantly detect AI-generated content.
Like Copyleaks - Plagiarism detector, Winston AI is in the Ai Content Detection category. Winston AI is freemium, while Copyleaks - Plagiarism detector is paid. Worth comparing on the detail page.
Ai Content Detection
Polishing text accuracy with AI.
Like Copyleaks - Plagiarism detector, AI Detector is in the Ai Content Detection category. AI Detector is freemium, while Copyleaks - Plagiarism detector is paid. Worth comparing on the detail page.
Ai Content Detection
Detect AI-generated text with high accuracy.
Like Copyleaks - Plagiarism detector, ZeroGPT is in the Ai Content Detection category. ZeroGPT is freemium, while Copyleaks - Plagiarism detector is paid. Worth comparing on the detail page.
Ai Content Detection
Spot AI-generated content as you browse.
Like Copyleaks - Plagiarism detector, Detect GPT is in the Ai Content Detection category. Detect GPT is free, while Copyleaks - Plagiarism detector is paid. Worth comparing on the detail page.
Ai Content Detection
Detect AI-generated content with accuracy
Like Copyleaks - Plagiarism detector, GPTZero is in the Ai Content Detection category. GPTZero is freemium, while Copyleaks - Plagiarism detector is paid. Worth comparing on the detail page.
Ai Content Detection
Detect AI-generated text with high accuracy
Like Copyleaks - Plagiarism detector, GPTKit is in the Ai Content Detection category. GPTKit is freemium, while Copyleaks - Plagiarism detector is paid. Worth comparing on the detail page.
Ai Content Detection
Detect AI-generated text with precision
Like Copyleaks - Plagiarism detector, ZeroGPT.CC is in the Ai Content Detection category. ZeroGPT.CC is free, while Copyleaks - Plagiarism detector is paid. Worth comparing on the detail page.
Ai Content Detection
Detect AI-generated content with precision.
Like Copyleaks - Plagiarism detector, Detecting-AI.com is in the Ai Content Detection category. Detecting-AI.com is freemium, while Copyleaks - Plagiarism detector is paid. Worth comparing on the detail page.
Ai Content Detection
Unmask AI-generated content with precision
Like Copyleaks - Plagiarism detector, AI Checker Tool is in the Ai Content Detection category. AI Checker Tool is free, while Copyleaks - Plagiarism detector is paid. Worth comparing on the detail page.
Ai Content Detection
Discover WriteHuman's AI Detector: distinguishing between AI-generated and human-written text.
Like Copyleaks - Plagiarism detector, WriteHuman: AI Detector is in the Ai Content Detection category. WriteHuman: AI Detector is freemium, while Copyleaks - Plagiarism detector is paid. Worth comparing on the detail page.
Ai Content Detection
Check if any text is AI-generated with AI Text Detector.
Like Copyleaks - Plagiarism detector, AI Text Detector is in the Ai Content Detection category. AI Text Detector is freemium, while Copyleaks - Plagiarism detector is paid. Worth comparing on the detail page.
Ai Content Detection
Detect AI-generated content with precision
Like Copyleaks - Plagiarism detector, AI Detector Write is in the Ai Content Detection category. AI Detector Write is free, while Copyleaks - Plagiarism detector is paid. Worth comparing on the detail page.
Ai Content Detection
Detect AI-generated content in 20+ languages
Like Copyleaks - Plagiarism detector, X Detector is in the Ai Content Detection category. X Detector is free, while Copyleaks - Plagiarism detector is paid. Worth comparing on the detail page.
17 more free/freemium alternatives listed below. Browse all Copyleaks - Plagiarism detector alternatives ↓
23 free or freemium alternatives to Copyleaks - Plagiarism detector on /tools/copyleaks-plagiarism-detector/alternatives.
9 more paid alternatives listed below. Browse all Copyleaks - Plagiarism detector alternatives ↓
15 paid alternatives to Copyleaks - Plagiarism detector on /tools/copyleaks-plagiarism-detector/alternatives.
Like Copyleaks - Plagiarism detector, AI Checker is in the Ai Content Detection category. AI Checker is free, while Copyleaks - Plagiarism detector is paid. Worth comparing on the detail page.
Neither Copyleaks - Plagiarism detector nor Free AI Detector by ContentAtScale has user ratings yet — be the first to review either tool to help future visitors compare them.
