WhoSellsData Reviews — Discover what people think of this product.

Who Sells Data is a curated, source-linked directory of companies that sell AI training datasets, human feedback data, reinforcement learning (RL) environments, evaluations, and simulation infrastructure to AI labs and agent developers. Every vendor profile clearly labels offerings, domains, data sources, funding, and verification dates so you can quickly compare options for model training, RL fine-tuning, and agent benchmarking.

Unlike generic vendor lists, this register emphasizes traceable sourcing and fact transparency: every published claim links to its original source and includes the date it was last checked, while unknown fields are explicitly marked instead of guessed. You can filter vendors by offering type (e.g., RL environments, evals, simulation, data annotation), domain focus (coding, robotics, finance, medical, enterprise workflows, and more), and underlying data sources (customer-derived, synthetic, expert-created, licensed, or public).

Maintained by Secludy AI, the directory sits alongside Secludy’s privacy-preserving identity synthesis technology, which replaces real identities with consistent synthetic counterparts across files, screenshots, and trajectories. This enables realistic training and evaluation without exposing PII or sensitive customer records.

Use Who Sells Data to:

• Discover specialized AI data vendors for robotics, enterprise agents, safety evals, and domain-specific LLM training
• Audit vendor claims via linked sources and recent verification dates
• Compare RL and evaluation providers by domain coverage, data provenance, and funding stage