# Annotation Chrome Plugin vs GPTZero

Annotation Chrome Plugin records 0 monthly visits with — month-over-month growth and Free pricing. GPTZero records 23,246,989 monthly visits with +32.5% growth and Freemium, Paid pricing.

| Metric | [Annotation Chrome Plugin](https://openaitools.app/tool/annotation-chrome-plugin) | [GPTZero](https://openaitools.app/tool/gptzero-me) |
| :--- | :--- | :--- |
| Website URL | https://chromewebstore.google.com/detail/annotation-chrome-plugin/jlpfcmmpfheebjnlkgaficoededimmij | https://gptzero.me |
| Categories | AI Text Classifier, AI Predictions, AI API, AI Developer Tools | AI Detector, AI Checker, AI Content Detector, AI Plagiarism Checker |
| Pricing Model | Free | Freemium, Paid |
| Monthly Visits | 0 | 23,246,989 |
| MoM Growth Rate | — | +32.5% |
| Primary Market | Global | United States |
| Direct Visits | 0 | 7,529,349 |
| Review Score | 4.2 | 4.1 |
| Saved Count | 0 | 41 |
| Supported Platforms | Browser Extension | Website |

## Annotation Chrome Plugin

Annotation Chrome Plugin is a lightweight Chrome extension published by Lexis Nexis that supports document classification and categorisation work. Rather than replacing the host application, it layers on top of it: when a reviewer opens a document in Lexis360.fr or in one of the Sesame applications, the plugin adds controls for entering custom annotations by hand and for reviewing annotations suggested automatically.

The prediction side is powered by internal SIE web services. The plugin sends a request for the current document and receives annotations returned by a prediction AI component, which the reviewer can then validate. That human-in-the-loop step is the core idea of the product: the model proposes, the specialist confirms, and the validated label feeds back into the classification and categorisation pipeline.

The extension is small (around 340 KiB), ships in English and French, attracts a few hundred users and is still actively maintained, with version 4.0.4 published in September 2025. Because it is tied to internal Lexis Nexis web services and specific French-language products, it is best understood as an internal productivity tool for teams already working inside that ecosystem rather than an open standalone annotation platform.

**Pricing & Plans:** Free to install from the Chrome Web Store. It relies on internal Lexis Nexis web services, so practical use is limited to organisations and users with access to the associated Lexis360 / Sesame environments.

- **Custom annotation entry:** Add your own annotations to the document currently open in the browser, without leaving the host application.
- **Prediction-AI annotation retrieval:** Contacts internal SIE web services to fetch annotations produced by a prediction AI component for the document you are viewing.
- **Annotation validation:** Review and validate returned annotations so that human judgement is applied before labels are accepted.
- **Classification and categorisation support:** Designed specifically to help classify and categorise documents in editorial and legal content workflows.
- **Bilingual, lightweight build:** Ships in English and French at roughly 340 KiB, with no data sold to third parties.

**Strengths:** Adds annotation and validation directly inside the tools users already work in; Human-in-the-loop design keeps a specialist in control of the final label; Very small footprint and a narrow, clearly defined purpose; Still maintained by Lexis Nexis, with a recent release in September 2025

**Limitations:** Useful only if you have access to the internal Lexis Nexis / Sesame web services; Very limited public documentation and no self-serve onboarding; Tiny install base and a single public rating, so community support is minimal

[Profile (Markdown)](https://openaitools.app/tool/annotation-chrome-plugin.md)

## GPTZero

GPTZero grew out of the practical problem that teachers and editors faced once generative text became common: how do you tell whether a piece of writing came from a person or a model? The product answers that with a detector that returns an overall AI likelihood score and highlights individual sentences it considers machine-written, so a reader can see where the suspicion comes from rather than just receiving a single verdict.

Over time the platform widened from a single text box into a suite aimed at institutions. Detector results are paired with a plagiarism checker, grammar and writing feedback, and optional process verification such as a writing replay that records how a document was typed. A Chrome extension and Google Docs add-on push detection into the tools students and staff already use, and the company offers classroom integrations plus an API for bulk or programmatic checks.

Because the buyers are largely schools, districts, and universities, GPTZero leans heavily on privacy and compliance claims: it states SOC 2 Type II compliance and alignment with FERPA, GDPR, and CCPA, and says student writing is not used to train models. The practical takeaway is that it is positioned as an academic-integrity and editorial-review tool rather than a novelty checker, which also means its more powerful features sit in paid tiers.

**Pricing & Plans:** Freemium plus paid plans. A free tier provides core detection with character limits per scan, while paid individual and institutional plans unlock advanced scan modes, higher limits, writing reports, and classroom integrations. Enterprise and API access are quoted separately.

- **Sentence-level AI detection:** Paste text or upload a document and get an overall AI probability score plus a sentence-by-sentence breakdown of which parts look machine-written.
- **Multi-model coverage:** Flags AI text from major model families including ChatGPT, Gemini, Claude, Llama, and others, rather than training for a single model.
- **Browser and docs extensions:** A Chrome extension and Google Docs add-on bring scanning into Gmail, Docs, Classroom, and other surfaces you already work in.
- **Plagiarism checking:** Checks content for copied passages from outside sources so you can separate AI-generation questions from originality questions.
- **Writing process verification:** Writing replay and advanced reports offer evidence about how a document was produced, useful for academic integrity workflows.

**Strengths:** Sentence-level highlighting shows why a passage was flagged instead of only giving a score; Covers text from many different AI model families, not just one chatbot; Integrations with Chrome, Google Docs, Canvas, and Google Classroom fit existing school workflows; Publishes concrete compliance claims (SOC 2 Type II, FERPA, GDPR, CCPA) that institutions can review

**Limitations:** Detection is probabilistic and can flag polished human writing or miss lightly edited AI text; Free scans are capped by character count, and useful reporting features require payment; Lean heavily on a single score without human judgment can lead to unfair accusations

[Profile (Markdown)](https://openaitools.app/tool/gptzero-me.md)

## Frequently Asked Questions

### How do Annotation Chrome Plugin and GPTZero compare in monthly traffic?

Annotation Chrome Plugin has 0 monthly visits, while GPTZero has 23,246,989. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

Annotation Chrome Plugin has a month-over-month growth rate of —; GPTZero has +32.5%.

### How does pricing compare?

Annotation Chrome Plugin: Free. Free to install from the Chrome Web Store. It relies on internal Lexis Nexis web services, so practical use is limited to organisations and users with access to the associated Lexis360 / Sesame environments. GPTZero: Freemium, Paid. Freemium plus paid plans. A free tier provides core detection with character limits per scan, while paid individual and institutional plans unlock advanced scan modes, higher limits, writing reports, and classroom integrations. Enterprise and API access are quoted separately.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [ZeroGPT](https://openaitools.app/tool/zerogpt) | 32,864,541 | +19.7% | Freemium, Paid | Offers broad multilingual AI detection and text humanization, but lacks GPTZero's detailed deep-scan reporting features. | [.md](https://openaitools.app/tool/zerogpt.md) |
| 2 | [Scribbr](https://openaitools.app/tool/scribbr) | 7,530,803 | +14.6% | Freemium | Combines AI detection with professional human proofreading and citation tools, but functions primarily as an editing service. | [.md](https://openaitools.app/tool/scribbr.md) |
| 3 | [LanguageTool](https://openaitools.app/tool/languagetool) | 5,707,795 | -4.2% | Freemium | AI grammar, spelling and style checker for 30+ languages | [.md](https://openaitools.app/tool/languagetool.md) |
| 4 | [Undetectable AI](https://openaitools.app/tool/undetectable-ai) | 3,113,403 | +17.5% | Freemium | Combines AI detection with robust text humanization tools, but focuses more heavily on rewriting than pure verification. | [.md](https://openaitools.app/tool/undetectable-ai.md) |
| 5 | [Copyleaks](https://openaitools.app/tool/copyleaks) | 2,402,494 | -14.1% | Paid, Contact for Pricing | Provides robust enterprise-grade content integrity and cross-media detection, but can be more expensive for individual users. | [.md](https://openaitools.app/tool/copyleaks.md) |
| 6 | [Originality.ai](https://openaitools.app/tool/originality) | 2,049,639 | +2.8% | Paid | Delivers strong fact-checking and comprehensive site-wide plagiarism audits, but has stricter paywalls than GPTZero. | [.md](https://openaitools.app/tool/originality.md) |
| 7 | [Isgen AI Detector](https://openaitools.app/tool/isgen-ai) | 901,917 | +5.8% | Freemium | Provides detailed sentence-level analysis for multilingual text, but lacks GPTZero's broad academic brand recognition. | [.md](https://openaitools.app/tool/isgen-ai.md) |
| 8 | [Winston AI](https://openaitools.app/tool/winston-ai) | 604,454 | +5.4% | Freemium, Free Trial | Excels at scanning both text and images with high accuracy, but offers fewer free daily checks than GPTZero. | [.md](https://openaitools.app/tool/winston-ai.md) |
| 9 | [HARPA AI](https://openaitools.app/tool/harpa-ai) | 537,461 | +99.3% | Freemium | One browser agent that combines every major AI model with web automation | [.md](https://openaitools.app/tool/harpa-ai.md) |
| 10 | [Detecting-AI.com](https://openaitools.app/tool/detecting-ai-com) | 505,146 | +493% | Freemium, Paid | AI detector that highlights evidence, not just a score | [.md](https://openaitools.app/tool/detecting-ai-com.md) |

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Source: https://openaitools.app/compare/annotation-chrome-plugin-vs-gptzero-me

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