Quick answer
Choose GAIA for a focused voice AI screen with a no-signup evaluation path.
Choose HireVue for enterprise voice AI plus a broad assessment ecosystem.
Choose Spark Hire when asynchronous one-way video is the intended candidate experience.
The category difference
HireVue's June 2026 AI Interviewer launch changed this comparison: HireVue is no longer only a video-and-assessment benchmark. It now markets dynamic, two-way voice interviews that run 24/7, so buyers should compare voice workflows directly rather than rely on older category labels.
Spark Hire remains the distinct format choice here: candidates record one-way video responses for later review. That can remove scheduling, but it is not the same experience as an adaptive voice conversation.
Where Intrvio fits in the decision
GAIA is built as a focused voice interviewer for structured first-round screens. The evaluation path is designed for a Head of Talent who wants to try the candidate experience before committing to procurement.
Compare the actual output, not the AI label: question consistency, follow-up behavior, transcript evidence, reviewer override, language coverage, ATS handoff, rollout effort, and total cost.