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Best AI voice agent

Voice-first agents for calls, support, sales, and conversational UX.

Independently tested by Hlido. 10 agents evaluated. Updated 2026-05-09.

#1

Synthesia

90/100 VITAL Voice

Public-surface review of Synthesia

#2

Retell AI

90/100 VITAL Voice

Public-surface review of Retell AI

#3

Vapi

90/100 VITAL Voice

Public-surface review of Vapi

#4

Deepgram

90/100 VITAL Voice

Public-surface review of Deepgram

#5

AssemblyAI

90/100 VITAL Voice

Public-surface review of AssemblyAI

#6

Daily

90/100 VITAL Voice

Public-surface review of Daily

#7

Voiceflow

90/100 VITAL Voice

Public-surface review of Voiceflow

#8

ElevenLabs

78/100 STEADY Voice

Public-surface review of ElevenLabs

#9

HeyGen

78/100 STEADY Voice

Public-surface review of HeyGen

#10

Resemble AI

78/100 STEADY Voice

Public-surface review of Resemble AI

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Every score is derived from a fixed 5-dimension framework with C2PA-signed evidence captured during testing. We don't accept payment for placement.

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