Best Grammarly Alternatives for AI Detection
30 AI tools that can replace Grammarly for detecting AI-written content, ranked by how closely they match. The percentage is a match score, not a popularity score.
Replacing: Grammarly — Writing confidence that follows you everywhereInput: text · 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
Input: text, documents · Output: text, data
Free planFrom $12.99/moAPIBrowser extensionTeams
88%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 6 we tag Grammarly 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
Input: text, documents, web pages · Output: text, data
Free planFrom $12.95/mo
86%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 6 we tag Grammarly for
AI DetectionPlagiarism Checking
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
3
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
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 2 of the 6 we tag Grammarly for
AI DetectionPlagiarism Checking
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
Input: text, images, video, documents · Output: text
From $7.99/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 3 of the 6 we tag Grammarly for
AI DetectionPlagiarism CheckingHumanizing Text
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.
5
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
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 6 we tag Grammarly 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.
6
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
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 6 we tag Grammarly 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.
7
The free plan hands you 5,000 characters per check
Input: text, documents · Output: text
Free planFrom $7/mo
62%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 1 of the 6 we tag Grammarly for
AI Detection
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
62%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 6 we tag Grammarly for
AI DetectionPlagiarism CheckingHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
9
ZeroGPT Plus can detect if text came from AI with high accuracy
Input: text, documents · Output: text
Free planFrom $9.9/mo
60%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 6 we tag Grammarly 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
Rephrase until it sounds right
Rewriting-first tool that also summarizes and checks plagiarism; free tier
Input: text, images, documents · Output: text, images, documents, slides
Free planFrom $19.95/mo
59%Limited overlap
00
How the score adds up
- Offers AI Detection as a secondary capability42/70
- Shares Grammarly's other goals9/10
- Feature description similarity13/20
Capped below the editor-ranked picks above it.
Shared goals 6 of the 6 we tag Grammarly for
Grammar CheckingAI DetectionPlagiarism CheckingRewritingWritingHumanizing Text
Also tagged for
Summarizing
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
11
59%Limited overlap
00
How the score adds up
- Offers AI Detection as a secondary capability42/70
- Shares Grammarly's other goals9/10
- Feature description similarity9/20
Capped below the editor-ranked picks above it.
Shared goals 6 of the 6 we tag Grammarly for
Grammar CheckingAI DetectionPlagiarism CheckingRewritingWritingHumanizing Text
Also tagged for
Essay Writing
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
12
Job applications get filtered by AI detection systems now
Input: text, documents · Output: text
Free plan
59%Limited overlap
00
How the score adds up
- Built for AI Detection (its core category)70/70
- Shares Grammarly's other goals2/10
- Feature description similarity2/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 6 we tag Grammarly 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
59%Limited overlap
00
How the score adds up
- Built for AI Detection (its core category)70/70
- Shares Grammarly's other goals2/10
- Feature description similarity5/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 6 we tag Grammarly for
AI Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
14
UndetectedGPT is an AI humanizer that rewrites machine-drafted text into natural writing aimed at passing detectors such as GPTZero, Turnitin and Originality.
Input: text, documents · Output: text
Free planFrom $19.99/moAPI
57%Limited overlap
00
How the score adds up
- Offers AI Detection as a secondary capability42/70
- Shares Grammarly's other goals5/10
- Feature description similarity10/20
Capped below the editor-ranked picks above it.
Shared goals 3 of the 6 we tag Grammarly for
AI DetectionRewritingHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
15
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
59%Limited overlap
00
How the score adds up
- Offers AI Detection as a secondary capability42/70
- Shares Grammarly's other goals9/10
- Feature description similarity12/20
Capped below the editor-ranked picks above it.
Shared goals 6 of the 6 we tag Grammarly for
Grammar CheckingAI DetectionPlagiarism CheckingRewritingWritingHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
16
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 AI Detection as a secondary capability42/70
- Shares Grammarly's other goals5/10
- Feature description similarity12/20
Capped below the editor-ranked picks above it.
Shared goals 3 of the 6 we tag Grammarly for
AI DetectionPlagiarism CheckingHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
17
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
59%Limited overlap
00
How the score adds up
- Built for AI Detection (its core category)70/70
- Shares Grammarly's other goals2/10
- Feature description similarity4/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 6 we tag Grammarly for
AI Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
18
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
59%Limited overlap
00
How the score adds up
- Built for AI Detection (its core category)70/70
- Shares Grammarly's other goals3/10
- Feature description similarity6/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 6 we tag Grammarly 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.
19
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
59%Limited overlap
00
How the score adds up
- Built for AI Detection (its core category)70/70
- Shares Grammarly's other goals2/10
- Feature description similarity2/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 6 we tag Grammarly 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.
20
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
59%Limited overlap
00
How the score adds up
- Built for AI Detection (its core category)70/70
- Shares Grammarly's other goals2/10
- Feature description similarity2/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 6 we tag Grammarly for
AI Detection
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
21
Reality Defender detects deepfakes and AI-manipulated media across audio, video and images.
Input: images, audio, video · Output: data
Free planAPITeams
59%Limited overlap
00
How the score adds up
- Built for AI Detection (its core category)70/70
- Shares Grammarly's other goals2/10
- Feature description similarity3/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 6 we tag Grammarly 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
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
59%Limited overlap
00
How the score adds up
- Built for AI Detection (its core category)70/70
- Shares Grammarly's other goals2/10
- Feature description similarity4/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 6 we tag Grammarly 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
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
59%Limited overlap
00
How the score adds up
- Built for AI Detection (its core category)70/70
- Shares Grammarly's other goals2/10
- Feature description similarity4/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 6 we tag Grammarly 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.
24
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
59%Limited overlap
00
How the score adds up
- Built for AI Detection (its core category)70/70
- Shares Grammarly's other goals5/10
- Feature description similarity5/20
Capped below the editor-ranked picks above it.
Shared goals 3 of the 6 we tag Grammarly for
AI DetectionPlagiarism CheckingHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
25
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
59%Limited overlap
00
How the score adds up
- Built for AI Detection (its core category)70/70
- Shares Grammarly's other goals3/10
- Feature description similarity11/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 6 we tag Grammarly for
AI DetectionHumanizing Text
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.
26
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 · same core category as Grammarly
00
How the score adds up
- Offers AI Detection as a secondary capability42/70
- Shares Grammarly's other goals9/10
- Feature description similarity12/20
Capped below the editor-ranked picks above it.
Shared goals 5 of the 6 we tag Grammarly for
Grammar CheckingAI DetectionPlagiarism CheckingRewritingWriting
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
27
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
59%Limited overlap
00
How the score adds up
- Built for AI Detection (its core category)70/70
- Shares Grammarly's other goals2/10
- Feature description similarity4/20
Capped below the editor-ranked picks above it.
Shared goals 1 of the 6 we tag Grammarly 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.
28
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
56%Limited overlap
00
How the score adds up
- Offers AI Detection as a secondary capability42/70
- Shares Grammarly's other goals8/10
- Feature description similarity7/20
Capped below the editor-ranked picks above it.
Shared goals 5 of the 6 we tag Grammarly for
Grammar CheckingAI DetectionPlagiarism CheckingWritingHumanizing Text
Also tagged for
SEO Writing
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
29
WriteHuman is an AI humanizer that rewrites machine-generated drafts so they read like a person wrote them.
Input: text · Output: text
Free planFrom $12/moAPI
58%Limited overlap
00
How the score adds up
- Offers AI Detection as a secondary capability42/70
- Shares Grammarly's other goals3/10
- Feature description similarity13/20
Capped below the editor-ranked picks above it.
Shared goals 2 of the 6 we tag Grammarly for
AI DetectionHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
30
BypassGPT is an AI humanizer that rewrites machine-generated text so it reads like human writing and passes AI detectors.
Input: text · Output: text
API
57%Limited overlap
00
How the score adds up
- Offers AI Detection as a secondary capability42/70
- Shares Grammarly's other goals5/10
- Feature description similarity10/20
Capped below the editor-ranked picks above it.
Shared goals 3 of the 6 we tag Grammarly for
AI DetectionRewritingHumanizing Text
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
Can it really replace Grammarly for detecting ai-written content? Vote on each alternative — no account needed. Votes gently reorder the list; they never change the match score.
Missing an alternative for detecting AI-written content? Suggest it
At a glance: top Grammarly alternatives for AI Detection
| Tool | Match | Input | Output | Pricing | Free plan | Rating | Category |
|---|---|---|---|---|---|---|---|
| GPTZero | 88% | text, documents | text, data | From $12.99/mo | Yes | — | AI Detector |
| Originality.AI | 86% | text, documents, web pages | text, data | From $12.95/mo | Yes | — | AI Detector |
| Turnitin | 82% | text, documents | data | — | No | — | AI Plagiarism Checker |
| ZeroGPT | 72% | text, images, video, documents | text | From $7.99/mo | No | — | AI Detector |
| Copyleaks | 72% | text, images, video, documents, code | data | From $13.99/mo | No | — | AI Detector |
| Winston AI | 72% | text, images, documents | data | From $10/mo | Yes | — | AI Detector |
Frequently asked
What is the best Grammarly alternative for detecting AI-written content?
GPTZero (88% match) is the closest alternative to Grammarly for detecting AI-written content: 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 (86% match) and Turnitin (82% match) come next.
Is there a free alternative to Grammarly for detecting AI-written content?
Yes. 19 of the 30 ranked alternatives have a free plan or free tier, including GPTZero, Originality.AI, Winston AI.
How is the match percentage calculated?
It measures how much of Grammarly's job a tool can take over for detecting AI-written content: 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 Grammarly's job each tool can take over when the goal is detecting AI-written content: 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.