Compare responsibilities and evidence
Our guides evaluate operating models, task fit and documented rights rather than a universal vendor score. A named provider example is based on its own public disclosures, with the attribution made clear; it is not a claim of hands-on product testing.
Evidence and attribution
Research references are maintained in private editorial records, with the underlying claim and source recorded together. Brief plain-text attribution appears where it is needed to understand a finding. Mentioning a research project or organization is not an endorsement.
What makes a comparison useful
We distinguish who supplies the workforce, who owns quality decisions, where data is handled and what rights transfer with the work. The right model depends on task difficulty and the owner's constraints, not a universal score.
Rights and uncertainty
Collection permissions, annotation contracts and permitted training uses are separate questions. General guidance cannot replace review of your agreements by qualified counsel.