Best QuillBot Alternatives for Plagiarism Checking
11 AI tools that can replace QuillBot for checking for plagiarism, ranked by how closely they match. The percentage is a match score, not a popularity score.
Replacing: QuillBot — Rephrase until it sounds rightInput: text, images, documents · Output: text, images, documents, slides
1
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.
Input: text, documents · Output: documents
Free plan
82%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 3 of the 7 we tag QuillBot for
AI DetectionGrammar CheckingPlagiarism Checking
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
2
Copyleaks is a content authenticity platform that checks whether text was written by AI and whether it copies existing sources.
Input: text, images, video, documents, code · Output: data
From $13.99/moAPI
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 7 we tag QuillBot 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.
3
Writing confidence that follows you everywhere
Grammar-first helper that follows you across apps, with plagiarism and AI detection too
Input: text · Output: text
Free planFrom $12/mo
72%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 6 of the 7 we tag QuillBot for
RewritingAI DetectionGrammar CheckingPlagiarism CheckingWritingHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
4
Turnitin is an academic integrity suite that schools, universities, and research organizations use to verify originality and deal with AI-written text.
Input: text, documents · Output: data
Teams
72%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 7 we tag QuillBot for
AI DetectionPlagiarism Checking
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
5
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
61%Partial replacement — covers the main need with gaps
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares QuillBot's other goals8/10
- Feature description similarity13/20
Capped below the editor-ranked picks above it.
Shared goals 6 of the 7 we tag QuillBot for
RewritingAI DetectionGrammar CheckingPlagiarism CheckingWritingHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
6
Trinka is an AI writing assistant and grammar checker aimed at academic and technical writing.
Input: text, documents · Output: text, documents
Free planTeams
59%Limited overlap
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares QuillBot's other goals7/10
- Feature description similarity10/20
Capped below the editor-ranked picks above it.
Shared goals 5 of the 7 we tag QuillBot for
RewritingAI DetectionGrammar CheckingPlagiarism CheckingWriting
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
7
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
59%Limited overlap
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares QuillBot's other goals4/10
- Feature description similarity14/20
Capped below the editor-ranked picks above it.
Shared goals 3 of the 7 we tag QuillBot for
AI DetectionPlagiarism CheckingHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
8
Winston AI is an AI content detector and plagiarism checker built for education, SEO, and writing.
Input: text, images, documents · Output: data
Free planFrom $10/moAPITeams
55%Limited overlap
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares QuillBot's other goals3/10
- Feature description similarity11/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 7 we tag QuillBot 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.
9
Scribbr AI Detector is a free checker that estimates whether a piece of writing was produced by an AI model.
Input: text · Output: data
Free plan
53%Limited overlap
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares QuillBot's other goals4/10
- Feature description similarity7/20
Capped below the editor-ranked picks above it.
Shared goals 3 of the 7 we tag QuillBot for
AI DetectionPlagiarism CheckingHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
10
Pangram Labs makes an AI detector that checks whether text was written by a person or generated by a language model.
Input: text, images, documents · Output: data
Free planFrom $20/moAPIBrowser extension
53%Limited overlap
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares QuillBot's other goals3/10
- Feature description similarity8/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 7 we tag QuillBot 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.
11
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 QuillBot's other goals1/10
- Feature description similarity8/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 7 we tag QuillBot 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 QuillBot for checking for plagiarism? Vote on each alternative — no account needed. Votes gently reorder the list; they never change the match score.
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At a glance: top QuillBot alternatives for Plagiarism Checking
| Tool | Match | Input | Output | Pricing | Free plan | Rating | Category |
|---|---|---|---|---|---|---|---|
| Scribbr Plagiarism Checker | 82% | text, documents | documents | Free | Yes | — | AI Plagiarism Checker |
| Copyleaks | 74% | text, images, video, documents, code | data | From $13.99/mo | No | — | AI Detector |
| Grammarly | 72% | text | text | From $12/mo | Yes | — | AI Grammar Checker |
| Turnitin | 72% | text, documents | data | — | No | — | AI Plagiarism Checker |
| Smodin | 61% | text, documents | text, data | — | No | — | AI Writing Assistants |
| Trinka AI | 59% | text, documents | text, documents | Free | Yes | — | AI Grammar Checker |
Frequently asked
What is the best QuillBot alternative for checking for plagiarism?
Scribbr Plagiarism Checker (82% match) is the closest alternative to QuillBot for checking for plagiarism: 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. Copyleaks (74% match) and Grammarly (72% match) come next.
Is there a free alternative to QuillBot for checking for plagiarism?
Yes. 6 of the 11 ranked alternatives have a free plan or free tier, including Scribbr Plagiarism Checker, Grammarly, Trinka AI.
How is the match percentage calculated?
It measures how much of QuillBot'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 QuillBot'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.