HumanSignal (Label Studio)

Active, privately held.

Sources 1, 2, 3 · checked 2026-11-08

• Fine-tuning workflows with ground truth data and RLHF, using configurable labeling templates
• Open-source Label Studio Community Edition; Starter Cloud and Enterprise editions
• LLM-as-a-judge, auto-labeling, reviewer workflows, and quality reporting (Enterprise)
• Data services: from-scratch data creation, annotation, and evaluation by domain experts

Sources 1, 2, 3 · checked 2026-11-08

• Teams that want to design and run their own pairwise or ranking interfaces
• Teams that want to start on open source and move to a hosted or managed option later

Sources 1, 2, 3 · checked 2026-11-08

Starter Cloud: $99 per month, plus $49 per month for each additional user, up to 12 users. Community Edition is open source. Enterprise and data services: custom quote.

Sources 1, 2, 3 · checked 2026-11-08

• SOC 2 (Enterprise: SOC 2 reporting access)
• HIPAA (Enterprise: 'SOC2 and HIPAA compliant cloud or on-prem')

Listed as stated by the vendor. Scope can differ by product or subsidiary; request current reports.

Sources 1, 2, 3 · checked 2026-11-08

• Self-serve editions mean you design rater instructions, calibration, and QA
• SOC 2 and HIPAA statements are tied to the Enterprise edition; confirm scope for Starter Cloud

Sources 1, 2, 3 · checked 2026-11-08