Appen records 665,840 monthly visits with +0.2% month-over-month growth and Contact for Pricing pricing. PDFgear records 2,845,280 monthly visits with -3.4% growth and Free pricing.
Human-validated training data and evaluation services for frontier AI models
A free, AI-powered PDF editor for every device
| Dimension / Metric | | |
|---|---|---|
| Official Domain | appen.com | pdfgear.com |
| Pricing Model | Contact for Pricing | Free |
| Monthly Visits | 665.84K (665,840) | 2.85M (2,845,280) |
| MoM Traffic Delta | +1.1K (+0.2%) | -100.48K (-3.4%) |
| Primary Market & Share | 🇺🇸 United States (22%) | 🇺🇸 United States (23.3%) |
| Direct Visits / mo | 238.31K | 675.08K |
| User Rating | 4.4 | 4.5 |
| 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.
A free, AI-powered PDF editor for every device
Edit text, images, shapes, links, signatures and form fields in a document as easily as in a word processor.
Chat with a PDF, generate summaries and extract answers or text from long and awkwardly laid-out documents.
Convert between PDF, Word, Excel, PowerPoint, TXT and images, including batch conversion with lossless output.
Turn scanned or image-based documents into fully editable Word or TXT files.
SpecialistAnthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing.
SpecialistAnthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing.
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.
An AI-powered creative and productivity suite spanning video, documents, diagrams and data
An AI-powered creative and productivity suite spanning video, documents, diagrams and data
Desktop document suite providing advanced editing, OCR conversion, and AI-powered chat assistance for local files.
Desktop document suite providing advanced editing, OCR conversion, and AI-powered chat assistance for local files.
Cloud-based document platform offering robust PDF editing, format conversion, and interactive AI chat features.
Cloud-based document platform offering robust PDF editing, format conversion, and interactive AI chat features.
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.
Browser-based PDF workspace combining document conversion, e-signatures, and automated AI summarization tools.
Browser-based PDF workspace combining document conversion, e-signatures, and automated AI summarization tools.
Feature-rich cross-platform PDF editor with integrated GPT capabilities for deep document summarization and analysis.
SpecialistLightweight conversational platform designed specifically for fast, effortless Q&A and summarization across uploaded PDF documents.
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.
Provides enterprise-grade AI training data and model evaluation at massive scale, but often with higher enterprise pricing.
Provides enterprise-grade AI training data and model evaluation at massive scale, but often with higher enterprise pricing.
SpecialistFocused document intelligence tool providing precise Q&A, summarization, and developer APIs for chatting with PDFs.
