Appen records 665,840 monthly visits with +0.2% month-over-month growth and Contact for Pricing pricing. Sequel records 10,904 monthly visits with -1.1% growth and Freemium, Contact for Pricing pricing.
Human-validated training data and evaluation services for frontier AI models
Give your AI agents live business data they can trust
| Dimension / Metric | | |
|---|---|---|
| Official Domain | appen.com | sequel.sh |
| Pricing Model | Contact for Pricing | Freemium, Contact for Pricing |
| Monthly Visits | 665.84K (665,840) | 10.9K (10,904) |
| MoM Traffic Delta | +1.1K (+0.2%) | -116 (-1.1%) |
| Primary Market & Share | 🇺🇸 United States (22%) | 🇺🇸 United States (42%) |
| Direct Visits / mo | 238.31K | 4.41K |
| 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.
Give your AI agents live business data they can trust
Hook up GA4, Google Ads, HubSpot, Stripe, Search Console, and warehouses or databases via OAuth or a key — read-only, with nothing to self-host.
Tell Sequel once what a qualified lead, active account, or blended CAC means for your team, and every agent applies the same definition every time.
Sequel returns the query it ran with each result, so you can verify a figure instead of trusting it blindly.
Runs over MCP, so one connection serves Claude, ChatGPT, Cursor, Codex, and other MCP clients without reconnecting sources.
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.
An agentic analytics platform that turns questions into governed, trusted answers
An agentic analytics platform that turns questions into governed, trusted answers
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.
Chat with your data to get analysis, charts, reports, and slides
Chat with your data to get analysis, charts, reports, and slides
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
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.
The AI spreadsheet that connects to your data and explains its answers
The AI spreadsheet that connects to your data and explains its answers
