Best Free Copyleaks Alternatives
22 alternatives to Copyleaks with a free plan or free tier, ranked by how closely they match. The percentage is a match score, not a popularity score.
Replacing: Copyleaks — Copyleaks is a content authenticity platform that checks whether text was written by AI anInput: text, images, video, documents, code · Output: data
1
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
100%Near drop-in replacement · same core category as Copyleaks
00
How the score adds up
- Same core category55/55
- Covers Copyleaks's goals25/25
- Feature description similarity20/20
Shared goals 3 of the 3 we tag Copyleaks 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
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
96%Near drop-in replacement · same core category as Copyleaks
00
How the score adds up
- Same core category55/55
- Covers Copyleaks's goals25/25
- Feature description similarity16/20
Shared goals 3 of the 3 we tag Copyleaks 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.
3
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
Input: text, documents · Output: text, data
Free planFrom $12.99/moAPIBrowser extensionTeams
86%Strong alternative · same core category as Copyleaks
00
How the score adds up
- Same core category55/55
- Covers Copyleaks's goals18/25
- Feature description similarity13/20
Shared goals 2 of the 3 we tag Copyleaks for
AI DetectionPlagiarism Checking
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
4
Developers get API access for building AI detection into their own apps
Input: text, documents, web pages · Output: text, data
Free planFrom $12.95/mo
85%Strong alternative · same core category as Copyleaks
00
How the score adds up
- Same core category55/55
- Covers Copyleaks's goals18/25
- Feature description similarity12/20
Shared goals 2 of the 3 we tag Copyleaks for
AI DetectionPlagiarism Checking
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
5
ZeroGPT Plus can detect if text came from AI with high accuracy
Input: text, documents · Output: text
Free planFrom $9.9/mo
82%Strong alternative · same core category as Copyleaks
00
How the score adds up
- Same core category55/55
- Covers Copyleaks's goals18/25
- Feature description similarity9/20
Shared goals 2 of the 3 we tag Copyleaks 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.
6
AI or Not is an AI detector that checks whether images, text, video, audio and music were generated by AI, and flags deepfakes.
Input: text, images, audio, video · Output: data
Free planFrom $5/moAPITeams
87%Strong alternative · same core category as Copyleaks
00
How the score adds up
- Same core category55/55
- Covers Copyleaks's goals18/25
- Feature description similarity14/20
Shared goals 2 of the 3 we tag Copyleaks for
AI DetectionFake Image Detection
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
85%Strong alternative · same core category as Copyleaks
00
How the score adds up
- Same core category55/55
- Covers Copyleaks's goals18/25
- Feature description similarity12/20
Shared goals 2 of the 3 we tag Copyleaks 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.
8
Dechecker AI breaks down AI detection differently
Input: text, documents · Output: text
Free planFrom $5/mo
78%Strong alternative · same core category as Copyleaks
00
How the score adds up
- Same core category55/55
- Covers Copyleaks's goals18/25
- Feature description similarity4/20
Shared goals 2 of the 3 we tag Copyleaks 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
Detect.ai combines an AI content detector with a humanizer in a single browser tool.
Input: text, documents · Output: text
Free planFrom $15.99/moMobile app
76%Strong alternative · same core category as Copyleaks
00
How the score adds up
- Same core category55/55
- Covers Copyleaks's goals11/25
- Feature description similarity10/20
Shared goals 1 of the 3 we tag Copyleaks for
AI Detection
Also tagged for
Humanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
10
Reality Defender detects deepfakes and AI-manipulated media across audio, video and images.
Input: images, audio, video · Output: data
Free planAPITeams
81%Strong alternative · same core category as Copyleaks
00
How the score adds up
- Same core category55/55
- Covers Copyleaks's goals18/25
- Feature description similarity8/20
Shared goals 2 of the 3 we tag Copyleaks for
AI DetectionFake Image Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
11
The free plan hands you 5,000 characters per check
Input: text, documents · Output: text
Free planFrom $7/mo
74%Partial replacement — covers the main need with gaps · same core category as Copyleaks
00
How the score adds up
- Same core category55/55
- Covers Copyleaks's goals11/25
- Feature description similarity8/20
Shared goals 1 of the 3 we tag Copyleaks for
AI Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
12
isFake.ai is a tool designed for detecting AI-generated content across different media types, including text, images, audio, and videos. It employs proprietary algorithms to analyze for characteristic
Input: text, images, audio, video · Output: data
Free planFrom $3.99/mo
80%Strong alternative · same core category as Copyleaks
00
How the score adds up
- Same core category55/55
- Covers Copyleaks's goals18/25
- Feature description similarity7/20
Shared goals 2 of the 3 we tag Copyleaks for
AI DetectionFake Image Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
13
OmniDetect is an AI content detector that focuses on what to fix before you submit a piece of writing.
Input: text, documents, web pages · Output: text, data
Free planFrom $9.99/mo
71%Partial replacement — covers the main need with gaps · same core category as Copyleaks
00
How the score adds up
- Same core category55/55
- Covers Copyleaks's goals11/25
- Feature description similarity5/20
Shared goals 1 of the 3 we tag Copyleaks for
AI Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
14
Job applications get filtered by AI detection systems now
Input: text, documents · Output: text
Free plan
70%Partial replacement — covers the main need with gaps · same core category as Copyleaks
00
How the score adds up
- Same core category55/55
- Covers Copyleaks's goals11/25
- Feature description similarity4/20
Shared goals 1 of the 3 we tag Copyleaks for
AI Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
15
Sapling AI Detector scores pasted text or uploaded PDF and Word files for the probability that a model wrote it.
Input: text, documents · Output: data
Free planFrom $12/moAPIBrowser extensionTeams
74%Partial replacement — covers the main need with gaps · same core category as Copyleaks
00
How the score adds up
- Same core category55/55
- Covers Copyleaks's goals11/25
- Feature description similarity7/20
Shared goals 1 of the 3 we tag Copyleaks for
AI Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
16
69%Partial replacement — covers the main need with gaps · same core category as Copyleaks
00
How the score adds up
- Same core category55/55
- Covers Copyleaks's goals11/25
- Feature description similarity2/20
Shared goals 1 of the 3 we tag Copyleaks for
AI Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
17
Rephrase until it sounds right
Input: text, images, documents · Output: text, images, documents, slides
Free planFrom $19.95/mo
56%Limited overlap
00
How the score adds up
- One lists the other's core category30/55
- Covers Copyleaks's goals14/25
- Feature description similarity12/20
Shared goals 2 of the 3 we tag Copyleaks 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.
18
Illuminarty detects whether an image or a piece of text was created by AI.
Input: text, images · Output: data
Free planFrom $10/moAPI
61%Partial replacement — covers the main need with gaps
00
How the score adds up
- Each lists the other's core category39/55
- Covers Copyleaks's goals14/25
- Feature description similarity9/20
Shared goals 2 of the 3 we tag Copyleaks for
AI DetectionFake Image Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
19
54%Limited overlap
00
How the score adds up
- One lists the other's core category30/55
- Covers Copyleaks's goals14/25
- Feature description similarity10/20
Shared goals 2 of the 3 we tag Copyleaks for
AI DetectionPlagiarism Checking
Also tagged for
Essay WritingGrammar CheckingRewritingWritingHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
20
Writing confidence that follows you everywhere
Input: text · Output: text
Free planFrom $12/mo
51%Limited overlap
00
How the score adds up
- One lists the other's core category30/55
- Covers Copyleaks's goals14/25
- Feature description similarity7/20
Shared goals 2 of the 3 we tag Copyleaks 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.
21
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
58%Limited overlap
00
How the score adds up
- Each lists the other's core category39/55
- Covers Copyleaks's goals14/25
- Feature description similarity5/20
Shared goals 2 of the 3 we tag Copyleaks 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.
22
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
- One lists the other's core category30/55
- Covers Copyleaks's goals14/25
- Feature description similarity13/20
Shared goals 2 of the 3 we tag Copyleaks 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.
Can it really replace Copyleaks? 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 Copyleaks alternatives
| Tool | Match | Input | Output | Pricing | Free plan | Rating | Category |
|---|---|---|---|---|---|---|---|
| Winston AI | 100% | text, images, documents | data | From $10/mo | Yes | — | AI Detector |
| Pangram Labs | 96% | text, images, documents | data | From $20/mo | Yes | — | AI Detector |
| GPTZero | 86% | text, documents | text, data | From $12.99/mo | Yes | — | AI Detector |
| Originality.AI | 85% | text, documents, web pages | text, data | From $12.95/mo | Yes | — | AI Detector |
| ZeroGPT Plus | 82% | text, documents | text | From $9.9/mo | Yes | — | AI Detector |
| AI or Not | 87% | text, images, audio, video | data | From $5/mo | Yes | — | AI Detector |
Frequently asked
What is the best free Copyleaks alternative?
Winston AI (100% match) is the closest free alternative to Copyleaks: Winston AI is an AI content detector and plagiarism checker built for education, SEO, and writing. Pangram Labs (96% match) and GPTZero (86% match) come next.
What is the best Copyleaks alternative for checking for plagiarism?
Turnitin ranks first for checking for plagiarism at 88% match. See the full list of Copyleaks alternatives for Plagiarism Checking.
What is the best Copyleaks alternative for detecting AI-generated images?
AI Image Detector ranks first for detecting AI-generated images at 80% match. See the full list of Copyleaks alternatives for Fake Image Detection.
How is the match percentage calculated?
It measures how much of Copyleaks's job a tool can take over: 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 Copyleaks's job each tool can take over: 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.