Appen

Appen is a global AI training data provider with over 30 years of experience delivering human-annotated datasets, data annotation services, and AI evaluation solutions for machine learning teams building frontier models. The company operates a global contributor network spanning 170 countries and verified domain specialists across 50 fields, offering end-to-end data services across text, image, audio, video, geospatial, and multimodal data types, as well as a proprietary AI Data Platform (ADAP) for enterprise-scale annotation workflows. Appen serves approximately 80% of leading LLM builders and supports the full AI development lifecycle from supervised fine-tuning and RLHF to model evaluation and regulatory audit support. The company is headquartered in Chatswood, New South Wales, Australia, with US headquarters in Kirkland, Washington.