Labelbox

Free tier

The data factory for AI teams — powering the world's most ambitious AI labs

Free tier available·All audiences·API available

Key strengths

Trusted by 90%+ of leading US AI labs for post-training dataAlignerr network of 2.6M+ expert knowledge workers across 40+ countriesFull-stack robotics data including video, trajectories, and multimodal annotationsCustom private AGI benchmarks and frontier model evaluationsApplied research team publishing at top venues like NeurIPS and CVPR

Free tier + paid plans

San Francisco, USA

Founded 2018

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Labelbox is an enterprise-grade data factory platform purpose-built for AI post-training, evaluation, and reinforcement learning workflows. It combines a massive expert annotator network (Alignerr, with 2.6M+ credentialed workers), purpose-built data pipelines for RL reward signals and preference pairs, and custom rubric-based evaluation frameworks. The platform supports multimodal tasks spanning text, vision, coding, science, and robotics — including full trajectory and video annotation infrastructure for embodied AI. Labelbox also publishes applied research and maintains public leaderboards to benchmark frontier models.

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