Best GPTZero Alternatives in 2026
30 AI tools that can replace GPTZero, ranked by how much of what GPTZero does they cover. The percentage is a match score, not a popularity score.
Replacing: GPTZero — Used by over 10 million teachers and students across more than 100 countries, GPTZero deteInput: text, documents · Output: text, data
1
Developers get API access for building AI detection into their own apps
Developer-friendly detector with API access for embedding in your own apps; plagiarism checks too
Input: text, documents, web pages · Output: text, data
Free planFrom $12.95/mo
88%Strong alternative · same core category as GPTZero
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 GPTZero for
AI DetectionPlagiarism 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.
Content authenticity platform checking AI authorship and copied text, plus image detection and API
Input: text, images, video, documents, code · Output: data
From $13.99/moAPI
82%Strong alternative · same core category as GPTZero
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 GPTZero 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
Winston AI is an AI content detector and plagiarism checker built for education, SEO, and writing.
Built for education, SEO and writing; detector plus plagiarism checker with team features and API
Input: text, images, documents · Output: data
Free planFrom $10/moAPITeams
82%Strong alternative · same core category as GPTZero
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 GPTZero 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.
4
ZeroGPT processes text quickly to detect AI-generated content
Quick text scans for AI-written content, with humanizer and plagiarism tools; from $7.99
Input: text, images, video, documents · Output: text
From $7.99/mo
78%Strong alternative · same core category as GPTZero
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 GPTZero for
AI DetectionPlagiarism Checking
Also tagged for
Fake Image DetectionHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
5
Dechecker AI breaks down AI detection differently
Breaks AI detection results down differently, with a humanizer add-on; from $5 monthly
Input: text, documents · Output: text
Free planFrom $5/mo
72%Partial replacement — covers the main need with gaps · same core category as GPTZero
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 GPTZero 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
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, with LMS integration and team features
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 2 we tag GPTZero for
AI DetectionPlagiarism Checking
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
7
The free plan hands you 5,000 characters per check
Free plan allows 5,000 characters per check; paid from $7 monthly
Input: text, documents · Output: text
Free planFrom $7/mo
70%Partial replacement — covers the main need with gaps · same core category as GPTZero
00
How the score adds up
Score set by our editors after reviewing both products; the overlap below is what they weighed.
Shared goals 1 of the 2 we tag GPTZero for
AI Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
8
ZeroGPT Plus can detect if text came from AI with high accuracy
Detector with humanizer and plagiarism tools bundled in; free tier available
Input: text, documents · Output: text
Free planFrom $9.9/mo
70%Partial replacement — covers the main need with gaps · same core category as GPTZero
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 GPTZero 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
AI detectors slam you with word limits
Aimed at word-limit frustration in text detectors, and covers images; from $5 a month
Input: text, images · Output: data
From $5/mo
66%Partial replacement — covers the main need with gaps · same core category as GPTZero
00
How the score adds up
Score set by our editors after reviewing both products; the overlap below is what they weighed.
Shared goals 1 of the 2 we tag GPTZero for
AI Detection
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.
10
Detect.ai combines an AI content detector with a humanizer in a single browser tool.
Detector and humanizer together in one browser tool, with a mobile app; free tier
Input: text, documents · Output: text
Free planFrom $15.99/moMobile app
62%Partial replacement — covers the main need with gaps · same core category as GPTZero
00
How the score adds up
Score set by our editors after reviewing both products; the overlap below is what they weighed.
Shared goals 1 of the 2 we tag GPTZero 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.
11
Rephrase until it sounds right
Input: text, images, documents · Output: text, images, documents, slides
Free planFrom $19.95/mo
60%Partial replacement — covers the main need with gaps
00
How the score adds up
- One lists the other's core category30/55
- Covers GPTZero's goals19/25
- Feature description similarity11/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 2 we tag GPTZero 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.
12
61%Partial replacement — covers the main need with gaps · same core category as GPTZero
00
How the score adds up
- Same core category55/55
- Covers GPTZero's goals16/25
- Feature description similarity3/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 2 we tag GPTZero for
AI 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
61%Partial replacement — covers the main need with gaps · same core category as GPTZero
00
How the score adds up
- Same core category55/55
- Covers GPTZero's goals16/25
- Feature description similarity5/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 2 we tag GPTZero for
AI Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
14
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
61%Partial replacement — covers the main need with gaps · same core category as GPTZero
00
How the score adds up
- Same core category55/55
- Covers GPTZero's goals16/25
- Feature description similarity7/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 2 we tag GPTZero for
AI Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
15
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
61%Partial replacement — covers the main need with gaps · same core category as GPTZero
00
How the score adds up
- Same core category55/55
- Covers GPTZero's goals25/25
- Feature description similarity13/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 2 we tag GPTZero 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.
16
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
61%Partial replacement — covers the main need with gaps · same core category as GPTZero
00
How the score adds up
- Same core category55/55
- Covers GPTZero's goals16/25
- Feature description similarity8/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 2 we tag GPTZero for
AI Detection
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.
17
Undetectable AI bundles an AI text detector, an AI humanizer and an AI image detector into one account.
Input: text, images, documents · Output: text, data
Free trialFrom $5/moAPIBrowser extensionTeams
61%Partial replacement — covers the main need with gaps · same core category as GPTZero
00
How the score adds up
- Same core category55/55
- Covers GPTZero's goals16/25
- Feature description similarity9/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 2 we tag GPTZero for
AI Detection
Also tagged for
Fake Image DetectionHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
18
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
61%Partial replacement — covers the main need with gaps · same core category as GPTZero
00
How the score adds up
- Same core category55/55
- Covers GPTZero's goals25/25
- Feature description similarity8/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 2 we tag GPTZero 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.
19
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
- Each lists the other's core category39/55
- Covers GPTZero's goals19/25
- Feature description similarity6/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 2 we tag GPTZero 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.
20
Hive Moderation is an AI content moderation provider built for trust and safety teams at enterprise scale.
Input: text, images, audio, video · Output: data
APITeams
61%Partial replacement — covers the main need with gaps · same core category as GPTZero
00
How the score adds up
- Same core category55/55
- Covers GPTZero's goals16/25
- Feature description similarity3/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 2 we tag GPTZero for
AI Detection
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.
21
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
61%Partial replacement — covers the main need with gaps · same core category as GPTZero
00
How the score adds up
- Same core category55/55
- Covers GPTZero's goals16/25
- Feature description similarity10/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 2 we tag GPTZero for
AI Detection
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.
22
Reality Defender detects deepfakes and AI-manipulated media across audio, video and images.
Input: images, audio, video · Output: data
Free planAPITeams
61%Partial replacement — covers the main need with gaps · same core category as GPTZero
00
How the score adds up
- Same core category55/55
- Covers GPTZero's goals16/25
- Feature description similarity6/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 2 we tag GPTZero for
AI Detection
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.
23
Pindrop is an enterprise deepfake detection and identity verification system that watches live phone calls, video meetings and contact center traffic for synthetic voices, fake faces and fraudulent...
Input: audio, video · Output: data
Teams
61%Partial replacement — covers the main need with gaps · same core category as GPTZero
00
How the score adds up
- Same core category55/55
- Covers GPTZero's goals16/25
- Feature description similarity5/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 2 we tag GPTZero for
AI Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
24
Sensity AI is a forensic deepfake detection service that analyzes videos, images and audio for signs of AI manipulation.
Input: images, audio, video, web pages · Output: documents
APITeams
61%Partial replacement — covers the main need with gaps · same core category as GPTZero
00
How the score adds up
- Same core category55/55
- Covers GPTZero's goals16/25
- Feature description similarity3/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 2 we tag GPTZero for
AI Detection
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.
25
Writing confidence that follows you everywhere
Input: text · Output: text
Free planFrom $12/mo
56%Limited overlap
00
How the score adds up
- One lists the other's core category30/55
- Covers GPTZero's goals19/25
- Feature description similarity7/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 2 we tag GPTZero 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.
26
56%Limited overlap
00
How the score adds up
- One lists the other's core category30/55
- Covers GPTZero's goals19/25
- Feature description similarity7/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 2 we tag GPTZero 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.
27
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
58%Limited overlap
00
How the score adds up
- One lists the other's core category30/55
- Covers GPTZero's goals19/25
- Feature description similarity9/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 2 we tag GPTZero 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.
28
Trinka is an AI writing assistant and grammar checker aimed at academic and technical writing.
Input: text, documents · Output: text, documents
Free planTeams
58%Limited overlap
00
How the score adds up
- One lists the other's core category30/55
- Covers GPTZero's goals19/25
- Feature description similarity9/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 2 we tag GPTZero 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.
29
UnGPT takes AI-generated text and rewrites it to mimic natural human writing patterns that slip past detection algorithms
Input: text · Output: text
From $9.92/moBrowser extension
55%Limited overlap
00
How the score adds up
- One lists the other's core category30/55
- Covers GPTZero's goals19/25
- Feature description similarity6/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 2 we tag GPTZero for
AI DetectionPlagiarism Checking
Also tagged for
Grammar CheckingWritingSEO WritingHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
30
A content marketer drafts 15 blog posts using AI, then realizes every piece sounds robotic and formulaic
Input: text · Output: text
Free planFrom $7.99/mo
53%Limited overlap
00
How the score adds up
- One lists the other's core category30/55
- Covers GPTZero's goals19/25
- Feature description similarity4/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 2 we tag GPTZero 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.
Can it really replace GPTZero? Vote on each alternative — no account needed. Votes gently reorder the list; they never change the match score.
Missing an alternative? Suggest it
Best GPTZero alternatives by goal
Every goal has its own ranked list — the match score is recomputed for that job alone.
At a glance: top GPTZero alternatives
| Tool | Match | Input | Output | Pricing | Free plan | Rating | Category |
|---|---|---|---|---|---|---|---|
| Originality.AI | 88% | text, documents, web pages | text, data | From $12.95/mo | Yes | — | AI Detector |
| Copyleaks | 82% | text, images, video, documents, code | data | From $13.99/mo | No | — | AI Detector |
| Winston AI | 82% | text, images, documents | data | From $10/mo | Yes | — | AI Detector |
| ZeroGPT | 78% | text, images, video, documents | text | From $7.99/mo | No | — | AI Detector |
| Dechecker AI | 72% | text, documents | text | From $5/mo | Yes | — | AI Detector |
| Turnitin | 72% | text, documents | data | — | No | — | AI Plagiarism Checker |
Frequently asked
What is the best GPTZero alternative?
Originality.AI (88% match) is the closest alternative to GPTZero. Copyleaks (82% match) and Winston AI (82% match) come next.
Is there a free alternative to GPTZero?
Yes. 20 of the 30 ranked alternatives have a free plan or free tier, including Originality.AI, Winston AI, Dechecker AI.
What is the best GPTZero alternative for checking for plagiarism?
Originality.AI ranks first for checking for plagiarism at 82% match. See the full list of GPTZero alternatives for Plagiarism Checking.
How is the match percentage calculated?
It measures how much of GPTZero'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 GPTZero'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.