Best Free ZeroGPT Alternatives
20 alternatives to ZeroGPT with a free plan or free tier, 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
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
90%Near drop-in replacement · 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.
2
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
88%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.
3
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
85%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.
4
ZeroGPT Plus can detect if text came from AI with high accuracy
Adds plagiarism checking and a humanizer to AI detection, from $9.90 a month
Input: text, documents · Output: text
Free planFrom $9.9/mo
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 DetectionPlagiarism CheckingHumanizing 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
Takes a different approach to breaking down detection results; humanizer included, from $5
Input: text, documents · Output: text
Free planFrom $5/mo
80%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 DetectionPlagiarism CheckingHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
6
The free plan hands you 5,000 characters per check
Free plan allows 5,000 characters per check; paid from $7 a month
Input: text, documents · Output: text
Free planFrom $7/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 1 of the 4 we tag ZeroGPT for
AI Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
7
Most AI detectors promise perfect accuracy
Budget-priced detector with a free tier, from $5 a month against $7.99
Input: text · Output: text
Free planFrom $5/mo
76%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 1 of the 4 we tag ZeroGPT for
AI Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
8
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
Checks text, images and other media for AI generation with a free tier
Input: text, images, audio, video · Output: data
Free planFrom $3.99/mo
72%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 DetectionFake Image Detection
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.
Detector and humanizer in one browser tool plus a mobile app with a free tier
Input: text, documents · Output: text
Free planFrom $15.99/moMobile app
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 DetectionHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
10
Job applications get filtered by AI detection systems now
Input: text, documents · Output: text
Free plan
65%Partial replacement — covers the main need with gaps · same core category as ZeroGPT
00
How the score adds up
- Same core category55/55
- Covers ZeroGPT's goals9/25
- Feature description similarity4/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 4 we tag ZeroGPT for
AI Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
11
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
65%Partial replacement — covers the main need with gaps · same core category as ZeroGPT
00
How the score adds up
- Same core category55/55
- Covers ZeroGPT's goals9/25
- Feature description similarity7/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 4 we tag ZeroGPT for
AI Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
12
Reality Defender detects deepfakes and AI-manipulated media across audio, video and images.
Input: images, audio, video · Output: data
Free planAPITeams
65%Partial replacement — covers the main need with gaps · same core category as ZeroGPT
00
How the score adds up
- Same core category55/55
- Covers ZeroGPT's goals14/25
- Feature description similarity2/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 4 we tag ZeroGPT 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
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
65%Partial replacement — covers the main need with gaps · same core category as ZeroGPT
00
How the score adds up
- Same core category55/55
- Covers ZeroGPT's goals20/25
- 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.
14
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
65%Partial replacement — covers the main need with gaps · same core category as ZeroGPT
00
How the score adds up
- Same core category55/55
- Covers ZeroGPT's goals14/25
- Feature description similarity3/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 4 we tag ZeroGPT for
AI DetectionFake Image Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
15
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
65%Partial replacement — covers the main need with gaps · same core category as ZeroGPT
00
How the score adds up
- Same core category55/55
- Covers ZeroGPT's goals20/25
- Feature description similarity7/20
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.
16
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
65%Partial replacement — covers the main need with gaps · same core category as ZeroGPT
00
How the score adds up
- Same core category55/55
- Covers ZeroGPT's goals9/25
- Feature description similarity5/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 4 we tag ZeroGPT for
AI Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
17
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
57%Limited overlap
00
How the score adds up
- Each lists the other's core category39/55
- Covers ZeroGPT's goals16/25
- Feature description similarity2/20
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.
18
Humaniser processes AI-generated text through pattern analysis and linguistic transformation to make it appear human-written
Input: text · Output: text
Free planFrom $5/moTeams
55%Limited overlap
00
How the score adds up
- Each lists the other's core category39/55
- Covers ZeroGPT's goals11/25
- Feature description similarity5/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 4 we tag ZeroGPT for
AI DetectionHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
19
You've pasted ChatGPT output into a paper or blog post and cringed at how robotic it sounds
Input: text · Output: text
Free plan
55%Limited overlap
00
How the score adds up
- Each lists the other's core category39/55
- Covers ZeroGPT's goals11/25
- Feature description similarity5/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 4 we tag ZeroGPT for
AI DetectionHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
20
Illuminarty detects whether an image or a piece of text was created by AI.
Input: text, images · Output: data
Free planFrom $10/moAPI
57%Limited overlap
00
How the score adds up
- Each lists the other's core category39/55
- Covers ZeroGPT's goals11/25
- Feature description similarity7/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 4 we tag ZeroGPT for
AI DetectionFake Image Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
Can it really replace ZeroGPT? Vote on each alternative — no account needed. Votes gently reorder the list; they never change the match score.
Missing an alternative? Suggest it
At a glance: top ZeroGPT alternatives
| Tool | Match | Input | Output | Pricing | Free plan | Rating | Category |
|---|---|---|---|---|---|---|---|
| GPTZero | 90% | text, documents | text, data | From $12.99/mo | Yes | — | AI Detector |
| Originality.AI | 88% | text, documents, web pages | text, data | From $12.95/mo | Yes | — | AI Detector |
| Winston AI | 85% | text, images, documents | data | From $10/mo | Yes | — | AI Detector |
| ZeroGPT Plus | 82% | text, documents | text | From $9.9/mo | Yes | — | AI Detector |
| Dechecker AI | 80% | text, documents | text | From $5/mo | Yes | — | AI Detector |
| Detecting-AI.com | 78% | text, documents | text | From $7/mo | Yes | — | AI Detector |
Frequently asked
What is the best free ZeroGPT alternative?
GPTZero (90% match) is the closest free alternative to ZeroGPT: 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. Originality.AI (88% match) and Winston AI (85% match) come next.
What is the best ZeroGPT alternative for humanizing AI text?
Undetectable AI ranks first for humanizing AI text at 85% match. See the full list of ZeroGPT alternatives for Humanizing Text.
What is the best ZeroGPT alternative for checking for plagiarism?
Copyleaks ranks first for checking for plagiarism at 82% match. See the full list of ZeroGPT alternatives for Plagiarism Checking.
What is the best ZeroGPT alternative for detecting AI-generated images?
AI or Not ranks first for detecting AI-generated images at 82% match. See the full list of ZeroGPT alternatives for Fake Image Detection.
How is the match percentage calculated?
It measures how much of ZeroGPT'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 ZeroGPT'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.