Appen records 665,840 monthly visits with +0.2% month-over-month growth and Contact for Pricing pricing. UltiHash records 4,910 monthly visits with +56.4% growth and Freemium, Paid, Contact for Pricing pricing.
Human-validated training data and evaluation services for frontier AI models
Lightning-fast object storage built for AI
| Dimension / Metric | | |
|---|---|---|
| Official Domain | appen.com | ultihash.io |
| Pricing Model | Contact for Pricing | Freemium, Paid, Contact for Pricing |
| Monthly Visits | 665.84K (665,840) | 4.91K (4,910) |
| MoM Traffic Delta | +1.1K (+0.2%) | +1.77K (+56.4%) |
| Primary Market & Share | 🇺🇸 United States (22%) | 🇺🇸 United States (82.2%) |
| Direct Visits / mo | 238.31K | 1.95K |
| User Rating | 4.4 | 4.4 |
| 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.
Lightning-fast object storage built for AI
Optimized throughput keeps GPUs and TPUs fed during training and inference so compute is not wasted on I/O bottlenecks.
Binary-level deduplication detects duplicate byte strings and versions, lowering the total cost of ownership for large datasets.
Drop into existing pipelines without changing your stack, working with Parquet, Iceberg and standard S3 tools.
Choose a managed serverless service hosted in EU Tier 1 datacenters, or deploy the Kubernetes-native Self-Hosted edition anywhere.
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-sourceOpen-source model and dataset hub with one-click online demos
Free / Open-sourceOpen-source model and dataset hub with one-click online demos
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 vision AI models and a full platform to train, annotate, and deploy them
Free / Open-sourceReal-time vision AI models and a full platform to train, annotate, and deploy them
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.
Track, evaluate, and ship AI models and agents in one connected environment.
Track, evaluate, and ship AI models and agents in one connected environment.
SpecialistCheck which local AI models your GPU or Mac can actually run
SpecialistCheck which local AI models your GPU or Mac can actually run
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-sourceOpen-source data integration engineered for AI agents and analytics
Free / Open-sourceOpen-source data integration engineered for AI agents and analytics
