Best ZeroGPT Alternatives for Plagiarism Checking
14 AI tools that can replace ZeroGPT for checking for plagiarism, ranked by how closely they match. The percentage is a match score, not a popularity score.
Replacing: ZeroGPTInput: text, images, video, documents · Output: text
1
Copyleaks is a content authenticity platform that checks whether text was written by AI and whether it copies existing sources.
Content authenticity platform that checks for 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 ZeroGPT
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 4 we tag ZeroGPT for
AI DetectionFake Image DetectionPlagiarism Checking
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.
Academic integrity suite for schools and universities; connects to LMS platforms
Input: text, documents · Output: data
Teams
80%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 4 we tag ZeroGPT for
AI DetectionPlagiarism Checking
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
3
Developers get API access for building AI detection into their own apps
Offers API access so detection can be built into your own apps; plagiarism checks too
Input: text, documents, web pages · Output: text, data
Free planFrom $12.95/mo
78%Strong alternative · same core category as ZeroGPT
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 4 we tag ZeroGPT for
AI DetectionPlagiarism 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
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 3 of the 4 we tag ZeroGPT for
AI DetectionPlagiarism CheckingHumanizing Text
Also tagged for
Grammar CheckingRewritingWriting
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
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 3 of the 4 we tag ZeroGPT for
AI DetectionPlagiarism CheckingHumanizing Text
Also tagged for
Grammar CheckingRewritingSummarizingWriting
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
6
Used by over 10 million teachers and students across more than 100 countries, GPTZero detects AI-generated text across major language models while providing a suite of writing verification tools
Used by over 10 million teachers and students; Chrome extension, Canvas link, API
Input: text, documents · Output: text, data
Free planFrom $12.99/moAPIBrowser extensionTeams
66%Partial replacement — covers the main need with gaps · same core category as ZeroGPT
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 4 we tag ZeroGPT for
AI DetectionPlagiarism Checking
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
7
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
66%Partial replacement — covers the main need with gaps · same core category as ZeroGPT
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 4 we tag ZeroGPT 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
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
61%Partial replacement — covers the main need with gaps
00
How the score adds up
- Built for Plagiarism Checking (its core category)70/70
- Shares ZeroGPT's other goals4/10
- Feature description similarity8/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 4 we tag ZeroGPT 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.
9
Winston AI is an AI content detector and plagiarism checker built for education, SEO, and writing.
Detector and plagiarism checker for education and SEO with a free trial, API, team plans
Input: text, images, documents · Output: data
Free planFrom $10/moAPITeams
58%Limited overlap · same core category as ZeroGPT
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares ZeroGPT's other goals8/10
- Feature description similarity8/20
Capped below the editor-ranked picks above it.
Shared goals 3 of the 4 we tag ZeroGPT for
AI DetectionFake Image DetectionPlagiarism Checking
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
56%Limited overlap · same core category as ZeroGPT
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares ZeroGPT's other goals8/10
- Feature description similarity6/20
Capped below the editor-ranked picks above it.
Shared goals 3 of the 4 we tag ZeroGPT for
AI DetectionFake Image DetectionPlagiarism Checking
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
11
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
53%Limited overlap
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares ZeroGPT's other goals6/10
- Feature description similarity4/20
Capped below the editor-ranked picks above it.
Shared goals 3 of the 4 we tag ZeroGPT for
AI DetectionPlagiarism CheckingHumanizing Text
Also tagged for
Grammar CheckingRewritingWriting
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
12
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
52%Limited overlap
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares ZeroGPT's other goals6/10
- Feature description similarity3/20
Capped below the editor-ranked picks above it.
Shared goals 3 of the 4 we tag ZeroGPT for
AI DetectionPlagiarism CheckingHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
13
Trinka is an AI writing assistant and grammar checker aimed at academic and technical writing.
Input: text, documents · Output: text, documents
Free planTeams
50%Limited overlap
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares ZeroGPT's other goals4/10
- Feature description similarity4/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 4 we tag ZeroGPT 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.
14
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
50%Limited overlap
00
How the score adds up
- Offers Plagiarism Checking as a secondary capability42/70
- Shares ZeroGPT's other goals2/10
- Feature description similarity6/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 4 we tag ZeroGPT 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 ZeroGPT 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 ZeroGPT 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 | 80% | text, documents | data | — | No | — | AI Plagiarism Checker |
| Originality.AI | 78% | text, documents, web pages | text, data | From $12.95/mo | Yes | — | AI Detector |
| Grammarly | 70% | text | text | From $12/mo | Yes | — | AI Grammar Checker |
| QuillBot | 70% | text, images, documents | text, images, documents, slides | From $19.95/mo | Yes | — | AI Rewriter |
| GPTZero | 66% | text, documents | text, data | From $12.99/mo | Yes | — | AI Detector |
Frequently asked
What is the best ZeroGPT alternative for checking for plagiarism?
Copyleaks (82% match) is the closest alternative to ZeroGPT 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 (80% match) and Originality.AI (78% match) come next.
Is there a free alternative to ZeroGPT for checking for plagiarism?
Yes. 9 of the 14 ranked alternatives have a free plan or free tier, including Originality.AI, Grammarly, QuillBot.
How is the match percentage calculated?
It measures how much of ZeroGPT'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 ZeroGPT'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.