Appen records 665,840 monthly visits with +0.2% month-over-month growth and Contact for Pricing pricing. CapMonster Cloud records 862,340 monthly visits with +36.3% growth and Paid pricing.
Human-validated training data and evaluation services for frontier AI models
AI-powered CAPTCHA solving API built for scale
| Dimension / Metric | | |
|---|---|---|
| Official Domain | appen.com | capmonster.cloud |
| Pricing Model | Contact for Pricing | Paid |
| Monthly Visits | 665.84K (665,840) | 862.34K (862,340) |
| MoM Traffic Delta | +1.1K (+0.2%) | +229.65K (+36.3%) |
| Primary Market & Share | 🇺🇸 United States (22%) | 🇧🇷 Brazil (16.7%) |
| Direct Visits / mo | 238.31K | 32.7K |
| User Rating | 4.4 | 4.2 |
| 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-powered CAPTCHA solving API built for scale
Supports reCAPTCHA v2/v3 and Enterprise, Cloudflare Turnstile and Bot Challenge, AWS WAF, GeeTest, Tencent CAPTCHA, Yidun, Text CAPTCHA and more.
Integrate with official libraries for C#, Python, JavaScript, Go, and PHP, or use the API of other services via compatibility.
Chrome and Firefox extensions detect and solve CAPTCHAs automatically in the background while you browse.
Most challenge types can be solved without supplying your own proxies, simplifying setup.
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.
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.
SpecialistEnterprise-grade web data infrastructure offering robust proxy networks and automated CAPTCHA solving capabilities.
SpecialistEnterprise-grade web data infrastructure offering robust proxy networks and automated CAPTCHA solving capabilities.
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.
Delivers advanced multimodal data curation and annotation infrastructure, but requires your own annotation workforce for labeling tasks.
Delivers advanced multimodal data curation and annotation infrastructure, but requires your own annotation workforce for labeling tasks.
SpecialistAgent observability, evaluation, and continuous improvement for production AI
SpecialistAgent observability, evaluation, and continuous improvement for production AI
SpecialistThe multimodal data layer for computer vision and physical AI teams
SpecialistThe multimodal data layer for computer vision and physical AI teams
SpecialistManaged headless browser platform providing cloud automation APIs, though without built-in automated CAPTCHA solving.
SpecialistManaged headless browser platform providing cloud automation APIs, though without built-in automated CAPTCHA solving.
Offers pre-packaged AI training datasets and custom data collection services, but with a smaller global crowd than Appen.
Offers pre-packaged AI training datasets and custom data collection services, but with a smaller global crowd than Appen.
Free / Open-sourceProvides a flexible open-source annotation platform for self-hosting, but lacks Appen's managed enterprise human workforce services.
Free / Open-sourceProvides a flexible open-source annotation platform for self-hosting, but lacks Appen's managed enterprise human workforce services.
SpecialistProvides web scraping endpoints with built-in proxy rotation and CAPTCHA bypass capabilities.
SpecialistProvides web scraping endpoints with built-in proxy rotation and CAPTCHA bypass capabilities.
