What we include
Companies that sell RLHF or post-training data (preference comparisons, reward model data, SFT demonstrations, human feedback programs) or platforms built to collect it, and that describe this work on an active public website.
Sources
Each fact comes from the vendor’s own website, trust portal, or a primary release such as a company announcement or regulatory filing. Every profile lists its sources and the date we checked them.
What we do not do
We do not test vendors, score them, rank them, or publish reviews. We do not claim partnerships or customer relationships we cannot source. Where a vendor publishes no price, we say “Contact vendor”. Where we found no certification, we say so and suggest asking for documentation; that is not a finding that the vendor lacks one.
Certifications
Listed as the vendor states them. Scope can differ by product, edition, or subsidiary, so we recommend requesting reports. A certification stated as planned is not counted in filters.
Order
Vendor lists default to alphabetical order. Filters and comparisons change only what is shown, not any ranking.
Updates
We re-check sources at least every 90 days and when vendors announce material changes.
Commercial policy
Today we accept no payment for listings or placement. Sponsorship is disabled. If sponsorship is introduced later, sponsored items will be labeled, kept out of editorial comparisons and filters’ default order, and disclosed on this page.