Hume AI vs Retell AI

Hume AI

Audio

Retell AI

Audio

Tagline

Hume AI

Emotionally intelligent voice AI with expressive TTS, speech-to-speech, and human-feedback evaluation APIs.

Retell AI

Build, test and deploy production-grade AI voice agents for inbound and outbound calls.

Pricing

Hume AI

Freemium· Free: $0 · Starter: $3 · Creator: $7 · Pro: $70 · Scale: $200

Retell AI

Freemium· from $0.07/mo

Lowest paid tier

Hume AI

$3 · Starter

captured 2026-08-11

Retell AI

$0.07-$0.31 / min · Pay as you go

captured 2026-10-21

Free trial

Hume AI

Yes

Retell AI

Yes

API

Hume AI

Yes

Retell AI

Yes

Platforms

Hume AI

apiwebdiscord

Retell AI

—

Hacker News stories

Hume AI

5

checked 2026-10-13

Retell AI

1

checked 2026-10-20

Earliest Wayback capture

Hume AI

2015-09-05

earliest archived capture of the site, not a launch date

Retell AI

2024-02-21

earliest archived capture of the site, not a launch date

Model used

Hume AI

Octave, EVI, TADA

Retell AI

LLM-agnostic (OpenAI, Anthropic, Google and others selectable per agent); proprietary turn-taking model and voice pipeline in-house

Best for

Hume AI

Pick Hume AI if you're building a conversational voice agent where emotional expressiveness and natural turn-taking matter more than raw voice count.

Retell AI

Product and CX teams building production voice agents for high-volume inbound support or outbound sales — especially in healthcare, insurance, financial services and logistics where compliance, low latency and CRM/telephony integrations matter.

Not for

Hume AI

Skip it if you just need cheap bulk TTS narration or require fully open-weight models for on-prem deployment.

Retell AI

Hobbyists prototyping a text-only chatbot, teams that need fully self-hosted or open-source voice stacks, or low-volume use cases where per-minute pricing outweighs the convenience of a managed platform.

Editorial score

Hume AI

8.0 / 10

Retell AI

—

Use cases

Hume AI

expressive-ttsvoice-cloningconversational-voice-aispeech-to-speechvoice-agent-evaluation

Retell AI

AI inbound call answeringOutbound lead qualificationAppointment scheduling and remindersCollections and payment dialers24/7 customer support triageIVR replacementHealthcare intake and follow-up callsInsurance claims first-notice-of-lossVoice-enabled RAG knowledge assistantsChat and SMS agents sharing a voice knowledge base

Pros

Hume AI

• Emotional-expression research depth unmatched in mainstream TTS
• Speech-to-speech EVI model handles interruptions naturally
• Open-source TADA model available on Hugging Face
• Voice design and cloning built into Octave
• Human Feedback API accelerates voice-model evaluation

Retell AI

• Sub-second end-to-end latency (~600 ms) with a purpose-built turn-taking model — conversations feel natural rather than walkie-talkie.
• Batteries-included telephony: bring Twilio/Vonage/Telnyx/Amazon Connect or use Retell-provisioned numbers with SIP trunking.
• Real function calling for booking, transfers, payments and CRM writes, with pre-built HubSpot, Salesforce, Cal.com, n8n, Zapier and Make integrations.
• Streaming RAG knowledge base with auto-sync, plus simulation testing and continuous QA — the operational glue most DIY voice stacks skip.
• Enterprise compliance out of the box: HIPAA, SOC 2 Type II, GDPR, PII removal and safety guardrails as toggleable add-ons.
• Genuinely transparent pay-as-you-go pricing with a $10 starter credit, so you can benchmark cost per call before committing.

Cons

Hume AI

• Flagship Octave and EVI models are closed-source
• Pricing not published on landing page
• Narrower focus than general TTS providers like ElevenLabs

Retell AI

• Per-minute costs stack quickly once you enable QA ($0.10/min), knowledge base, denoising and premium LLMs — a 'cheap' agent can land near $0.30+/min.
• The specific LLMs are pluggable but Retell doesn't publish a default recommendation, so cost/quality tuning is on you.
• Not open source and there is no self-hosted option — regulated buyers who need on-prem inference are out of scope.
• Voice/telephony focus means it is overkill (and overpriced) for pure text chatbots you could run on a generic LLM API.
• True enterprise features (unlimited concurrency, custom compliance, dedicated support) require a sales conversation, not a self-serve upgrade.

Website

Hume AI

www.hume.ai

Retell AI

www.retellai.com

Editorial score: rule-based, 0–10, from AI-assisted profile inputs (see /methodology) — not a user rating; “—” means unscored. “Not listed” means we have no record of it, not that it is absent. GitHub figures and prices carry the date they were checked or captured; prices are shown as published, unconverted.