Appen vs Rely.io

The AI workspace where teams and agents get work done together

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.

The environments frontier AI trains on, and the agents that do the recurring work

Provides enterprise-grade AI training data and model evaluation at massive scale, but often with higher enterprise pricing.

Autonomous AI agents for customer service, content and operations

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

The intelligent documentation platform that keeps itself up to date

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.

Free / Open-sourceProvides a flexible open-source annotation platform for self-hosting, but lacks Appen's managed enterprise human workforce services.