What differs
- Entry pricing: HumanSignal lists Starter Cloud at $99 per month plus $49 per additional user (up to 12 users) and an open-source Community Edition; Kili lists a $0 Free Trial plan with seat and asset limits. Both quote Enterprise plans.
- Post-training workflows: HumanSignal describes fine-tuning with ground truth data and RLHF, plus LLM-as-a-judge in Enterprise; Kili describes SFT answers, RLHF preferences, and verifiable problems written by your own experts, with agreement measured before export.
- Published security: HumanSignal states SOC 2 and HIPAA for its Enterprise edition; Kili’s security information page lists practices but names no certification.
- Services: both offer data services in addition to the platform (HumanSignal data services; Kili dedicated labeling services add-on).
Who each tends to fit
Teams that want an open-source starting point may look first at HumanSignal. Teams whose raters are in-house specialists and who need agreement scoring built into post-training projects may look at Kili. Run a pilot with your own rubric either way.
Last checked: . No winner declared.