Appen records 665,840 monthly visits with +0.2% month-over-month growth and Contact for Pricing pricing. Sieve records 124 monthly visits with +1.6% growth and Contact for Pricing pricing.
Human-validated training data and evaluation services for frontier AI models
The data lab for real-world intelligence
| Dimension / Metric | | |
|---|---|---|
| Official Domain | appen.com | sievedata.com |
| Pricing Model | Contact for Pricing | Contact for Pricing |
| Monthly Visits | 665.84K (665,840) | 124 (124) |
| MoM Traffic Delta | +1.1K (+0.2%) | +2 (+1.6%) |
| Primary Market & Share | 🇺🇸 United States (22%) | 🌐 Global (—) |
| Direct Visits / mo | 238.31K | 54 |
| User Rating | 4.4 | 4.1 |
| 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.
The data lab for real-world intelligence
First-person recordings of economically valuable physical work, paired with hand-pose, motion and synchronised sensor annotations.
Multi-camera video and audio collection with bespoke rigs and controlled environments built to a client's specification.
Both simulated and real-world test suites that measure how well robot policies perform across tasks and conditions.
Petabyte-scale synchronised video and audio datasets, including published engineering work on embedding a billion videos for retrieval.
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.
Free / Open-sourceBuild, train, and deploy computer vision for the physical world
Free / Open-sourceBuild, train, and deploy computer vision for the physical world
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.
Free / Open-sourceReal-time image and video APIs, agentic DAM and creative automation in one platform
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.
The data, evaluations and systems behind AI that has to be right.
Free / Open-sourceAI data infrastructure for building production-grade models
Free / Open-sourceAI data infrastructure for building production-grade models
Free / Open-sourceMulti-modal AI detection API that flags synthetic images, text, audio, video and deepfakes
Free / Open-sourceMulti-modal AI detection API that flags synthetic images, text, audio, video and deepfakes
SpecialistAgent observability, evaluation, and continuous improvement for production AI
SpecialistAgent observability, evaluation, and continuous improvement for production AI
The multimodal data layer for computer vision and physical AI teams
Free / Open-sourceOne universal API for 500+ AI models and 1,000+ agentic tools
Free / Open-sourceVideo data infrastructure for physical AI and robot training
Free / Open-sourceVideo data infrastructure for physical AI and robot training
