Best Originality.AI Alternatives for Plagiarism Checking
12 AI tools that can replace Originality.AI for checking for plagiarism, ranked by how closely they match. The percentage is a match score, not a popularity score.
Replacing: Originality.AIInput: text, documents, web pages · Output: text, data
1
Copyleaks is a content authenticity platform that checks whether text was written by AI and whether it copies existing sources.
Authenticity platform that checks AI text and copied sources; API access
Input: text, images, video, documents, code · Output: data
From $13.99/moAPI
82%Strong alternative · same core category as Originality.AI
00
How the score adds up
Score set by our editors after reviewing both products; the overlap below is what they weighed.
Shared goals 2 of the 2 we tag Originality.AI for
AI DetectionPlagiarism Checking
Also tagged for
Fake Image Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
2
Turnitin is an academic integrity suite that schools, universities, and research organizations use to verify originality and deal with AI-written text.
Used by schools and research bodies to verify originality; team and LMS connections
Input: text, documents · Output: data
Teams
76%Strong alternative
00
How the score adds up
Score set by our editors after reviewing both products; the overlap below is what they weighed.
Shared goals 2 of the 2 we tag Originality.AI for
AI DetectionPlagiarism Checking
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
3
Scribbr Plagiarism Checker compares a document with a database of 99 billion web pages and 8 million publications and shows where the text matches existing sources.
Plagiarism scan against 99 billion web pages; fits Word and Google Drive
Input: text, documents · Output: documents
Free plan
74%Partial replacement — covers the main need with gaps
00
How the score adds up
Score set by our editors after reviewing both products; the overlap below is what they weighed.
Shared goals 2 of the 2 we tag Originality.AI for
AI DetectionPlagiarism Checking
Also tagged for
Grammar Checking
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
4
Writing confidence that follows you everywhere
Everyday writing help across apps, centred on grammar checking; free tier
Input: text · Output: text
Free planFrom $12/mo
70%Partial replacement — covers the main need with gaps
00
How the score adds up
Score set by our editors after reviewing both products; the overlap below is what they weighed.
Shared goals 2 of the 2 we tag Originality.AI for
AI DetectionPlagiarism Checking
Also tagged for
Grammar CheckingRewritingWritingHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
5
Rephrase until it sounds right
Input: text, images, documents · Output: text, images, documents, slides
Free planFrom $19.95/mo
66%Partial replacement — covers the main need with gaps
00
How the score adds up
Score set by our editors after reviewing both products; the overlap below is what they weighed.
Shared goals 2 of the 2 we tag Originality.AI for
AI DetectionPlagiarism Checking
Also tagged for
Grammar CheckingRewritingSummarizingWritingHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
6
Winston AI is an AI content detector and plagiarism checker built for education, SEO, and writing.
Detector and plagiarism checker for education, SEO and writing with a free trial; team plans
Input: text, images, documents · Output: data
Free planFrom $10/moAPITeams
61%Partial replacement — covers the main need with gaps · same core category as Originality.AI
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares Originality.AI's other goals10/10
- Feature description similarity13/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 2 we tag Originality.AI for
AI DetectionPlagiarism Checking
Also tagged for
Fake Image Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
7
Pangram Labs makes an AI detector that checks whether text was written by a person or generated by a language model.
Checks whether text is human-written or AI-generated; Google Docs and Gmail integrations
Input: text, images, documents · Output: data
Free planFrom $20/moAPIBrowser extension
61%Partial replacement — covers the main need with gaps · same core category as Originality.AI
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares Originality.AI's other goals10/10
- Feature description similarity12/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 2 we tag Originality.AI for
AI DetectionPlagiarism Checking
Also tagged for
Fake Image Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
8
Scribbr AI Detector is a free checker that estimates whether a piece of writing was produced by an AI model.
Free checker that estimates whether a piece of writing came from an AI
Input: text · Output: data
Free plan
59%Limited overlap · same core category as Originality.AI
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares Originality.AI's other goals10/10
- Feature description similarity7/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 2 we tag Originality.AI for
AI DetectionPlagiarism Checking
Also tagged for
Humanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
9
Smodin is an AI writing toolkit that puts an AI content detector, an AI humanizer, a plagiarism checker, an AI writer, a rewriter and an AI chat assistant in one account.
Input: text, documents · Output: text, data
58%Limited overlap
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares Originality.AI's other goals8/10
- Feature description similarity9/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 2 we tag Originality.AI for
AI DetectionPlagiarism Checking
Also tagged for
Grammar CheckingRewritingWritingHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
10
Trinka is an AI writing assistant and grammar checker aimed at academic and technical writing.
Input: text, documents · Output: text, documents
Free planTeams
57%Limited overlap
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares Originality.AI's other goals8/10
- Feature description similarity7/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 2 we tag Originality.AI for
AI DetectionPlagiarism Checking
Also tagged for
Grammar CheckingRewritingWriting
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
11
Phrasly is an AI writing workspace built around a humanizer that rewrites machine-generated text so it reads like natural human writing, without watermarks.
Input: text · Output: text
Free trialFrom $9.8/mo
54%Limited overlap
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares Originality.AI's other goals8/10
- Feature description similarity5/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 2 we tag Originality.AI for
AI DetectionPlagiarism Checking
Also tagged for
Humanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
12
Yomu AI is an academic writing assistant that drafts, edits and cites essays, research papers, literature reviews and theses inside one document editor.
Input: text, images, documents · Output: text
From $10/mo
52%Limited overlap
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares Originality.AI's other goals4/10
- Feature description similarity7/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 2 we tag Originality.AI for
Plagiarism Checking
Also tagged for
Essay WritingPDF WorkResearch Papers
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
Can it really replace Originality.AI for checking for plagiarism? Vote on each alternative — no account needed. Votes gently reorder the list; they never change the match score.
Missing an alternative for checking for plagiarism? Suggest it
At a glance: top Originality.AI alternatives for Plagiarism Checking
| Tool | Match | Input | Output | Pricing | Free plan | Rating | Category |
|---|---|---|---|---|---|---|---|
| Copyleaks | 82% | text, images, video, documents, code | data | From $13.99/mo | No | — | AI Detector |
| Turnitin | 76% | text, documents | data | — | No | — | AI Plagiarism Checker |
| Scribbr Plagiarism Checker | 74% | text, documents | documents | Free | Yes | — | AI Plagiarism Checker |
| Grammarly | 70% | text | text | From $12/mo | Yes | — | AI Grammar Checker |
| QuillBot | 66% | text, images, documents | text, images, documents, slides | From $19.95/mo | Yes | — | AI Rewriter |
| Winston AI | 61% | text, images, documents | data | From $10/mo | Yes | — | AI Detector |
Frequently asked
What is the best Originality.AI alternative for checking for plagiarism?
Copyleaks (82% match) is the closest alternative to Originality.AI for checking for plagiarism: Copyleaks is a content authenticity platform that checks whether text was written by AI and whether it copies existing sources. Turnitin (76% match) and Scribbr Plagiarism Checker (74% match) come next.
Is there a free alternative to Originality.AI for checking for plagiarism?
Yes. 7 of the 12 ranked alternatives have a free plan or free tier, including Scribbr Plagiarism Checker, Grammarly, QuillBot.
How is the match percentage calculated?
It measures how much of Originality.AI's job a tool can take over for checking for plagiarism: shared core category, how many of the same use cases it covers and how similar its feature set is. Popularity and ratings never change the percentage; they only break ties in the order. Lists are recomputed nightly and reviewed by editors for the most-visited tools.
How this list is ranked
The match score measures how much of Originality.AI's job each tool can take over when the goal is checking for plagiarism: shared core category, how many of the same use cases it covers, and how similar its feature set is. Popularity and ratings do not change the score; they only break ties in the order.
Lists are recomputed nightly from the live catalog and reviewed by our editors for the most-visited tools. Sponsored placements are marked and sit outside the ranking.