Appen records 665,840 monthly visits with +0.2% month-over-month growth and Contact for Pricing pricing. ZeroGPT records 32,864,541 monthly visits with +19.7% growth and Freemium, Paid pricing.
Human-validated training data and evaluation services for frontier AI models
AI content detection and a full writing toolkit in one place
| Dimension / Metric | | |
|---|---|---|
| Official Domain | appen.com | zerogpt.com |
| Pricing Model | Contact for Pricing | Freemium, Paid |
| Monthly Visits | 665.84K (665,840) | 32.86M (32,864,541) |
| MoM Traffic Delta | +1.1K (+0.2%) | +5.41M (+19.7%) |
| Primary Market & Share | 🇺🇸 United States (22%) | 🇺🇸 United States (43%) |
| Direct Visits / mo | 238.31K | 8.22M |
| User Rating | 4.4 | 3.8 |
| Supported Platforms | Website | Website |
Human-validated training data and evaluation services for frontier AI models
Chain-of-thought reasoning traces, SME-level RLHF, supervised fine-tuning demonstrations and adversarial red teaming for the most capable models.
Golden trajectories, RL environment design, failure-mode taxonomies and software-engineering-driven deep evaluation for autonomous agents.
Multilingual ASR and conversational speech data, expressive TTS annotation, vision-language model training data, video action labelling and voice-agent evaluation.
LiDAR point-cloud labeling, multi-camera sensor fusion, robot demonstration trajectories, world-model rollouts and embodied interaction logs.
AI content detection and a full writing toolkit in one place
Paste up to 15,000 characters or upload a file and get a highlighted breakdown of which sentences appear AI-written, plus an overall percentage score and a downloadable PDF report.
Beyond text, ZeroGPT offers an AI image detector and an AI video detector that performs frame-level analysis to flag generated or manipulated visuals.
Compare your text against billions of sources through the plagiarism checker, or rewrite and humanize AI text with the paraphraser and AI humanizer while keeping the original meaning.
A bundled writing suite covers summarization, grammar and spelling correction, translation across many languages, a dictionary, word and character counting, citation generation, and an AI email writer.
SpecialistCross-platform writing assistant focused on real-time grammar and tone correction rather than AI content detection.
SpecialistCross-platform writing assistant focused on real-time grammar and tone correction rather than AI content detection.
SpecialistPopular paraphrasing assistant focused on rewriting and grammar correction, but lacks dedicated AI detection scanners.
SpecialistPopular paraphrasing assistant focused on rewriting and grammar correction, but lacks dedicated AI detection scanners.
Industry-standard AI content detection trusted by educators, offering robust sentence-level analysis similar to ZeroGPT.
Industry-standard AI content detection trusted by educators, offering robust sentence-level analysis similar to ZeroGPT.
SpecialistConnects teams directly with verified human participants for preference tuning and studies, but lacks managed end-to-end labeling pipelines.
SpecialistConnects teams directly with verified human participants for preference tuning and studies, but lacks managed end-to-end labeling pipelines.
SpecialistAcademic editing platform pairing AI plagiarism detection with professional human proofreaders for student papers.
SpecialistAcademic editing platform pairing AI plagiarism detection with professional human proofreaders for student papers.
Combines reliable AI detection with advanced text humanization tools to rewrite machine-generated content naturally.
Combines reliable AI detection with advanced text humanization tools to rewrite machine-generated content naturally.
Enterprise-grade content verification suite detecting AI text, images, and source code across multiple languages.
Enterprise-grade content verification suite detecting AI text, images, and source code across multiple languages.
Comprehensive content integrity platform specialized in accurate AI detection and plagiarism checking for digital publishers.
Comprehensive content integrity platform specialized in accurate AI detection and plagiarism checking for digital publishers.
Blends custom software with dedicated human expert teams to handle complex operations, but operates as a bespoke service.
Blends custom software with dedicated human expert teams to handle complex operations, but operates as a bespoke service.
Multilingual AI content detection platform providing detailed sentence-level scoring and writing integrity utilities.
Multilingual AI content detection platform providing detailed sentence-level scoring and writing integrity utilities.
Combines robust data labeling tools with automated workflows, but focuses more on software tooling than managed human workforces.
Combines robust data labeling tools with automated workflows, but focuses more on software tooling than managed human workforces.
SpecialistOnline writing suite blending AI humanization tools with plagiarism and readability checking features.
SpecialistOnline writing suite blending AI humanization tools with plagiarism and readability checking features.
