Compare Lab
Deepgram vs Hume AI
Deepgram is positioned as speech recognition models with separate speech generation and managed voice-agent APIs. Hume AI is positioned as hume TTS and EVI API sunset: announced access end November 13, 2026 at 05:01 UTC. Retained
Deepgram is positioned as speech recognition models with separate speech generation and managed voice-agent APIs. Hume AI is positioned as hume TTS and EVI API sunset: announced access end November 13, 2026 at 05:01 UTC. Retained for historical comparison and migration research. Start by deciding who owns the missing layers, then inspect the documented differences below.
STT and Voice Engines are different product categories. An underlying engine or framework is not a complete substitute for a deployed agent workflow.
17 jointly documented catalog fields. This measures evidence coverage, not equivalent quality or an overall winner.
TTS + EVI API sunset · Announced end: 13 Nov 2026, 05:01 UTC. Read notice & sources →
Test opening hours, booking conflicts and an unanswered transfer.
Start where the records differ.
Values and evidence states are compared together. Shared facts follow the differences; Unknown never means No.
| Decision point | Deepgram | Hume AI |
|---|---|---|
| Billing modelDifferent records | component-stack | monthly-bundle |
| Billing unitDifferent records | STT audio minute; TTS thousand characters; agent WebSocket connection minute | Monthly subscription + EVI minutes / TTS characters / supplemental LLM usage |
| Bring your telephonyDifferent records | Yes | Yes |
| WebhooksDifferent records | YesUnknown | YesAPI / webhook |
| Bring your modelShared state | Yes | Yes |
| Warm transferShared state | Unknown | Unknown |
Your requirements & next steps
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Ready-made / AI receptionist · Strict evidence mode
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STT audio minutes, TTS characters and Voice Agent connection minutes are distinct.
Subscription includes TTS/EVI/Voice allowances; overage and managed external LLM usage add cost.
External provider and telephony bills excluded where applicable. Do not infer a complete monthly ceiling.
Free plan exists; paid entry is not a complete phone-call bill.
Billable open connection time is not just spoken audio.
Incompatible product allowances are not collapsed into one all-in minute price.
Growth is annual prepaid commitment, not invented monthly subscription.
First-month Creator promotion is separate from regular price; Enterprise custom.
No fixed included agent minutes inferred from credit dollars.
Plan-scoped EVI allowance; does not include every third-party carrier/model charge.
Initial credits, Growth commitments and tier rates are documented; no recurring free plan or universal rounding/contract terms inferred.
TTS characters, EVI minutes and supplemental model usage remain separate.
Agent pricing covers selected tier and components; full workload determines bill.
Not yet researched against this buyer-critical field standard.
Not yet researched against this buyer-critical field standard.
Carrier, hosting, model tier and BYO usage prevent a universal full monthly or per-minute ceiling.
Carrier, hosting, model tier and BYO usage prevent a universal full monthly or per-minute ceiling.
Anyone with this link can view the encoded decision criteria.
Vendor documentation establishes a claim. Public model benchmarks are separate context, not measurements of these platforms.
Open saved comparison ↗What to verify together.
Deepgram
The current Nova-3 streaming rate is promotional.
Voice Agent Standard $0.075/min; BYO TTS $0.065/min; BYO LLM + TTS $0.050/min; Advanced $0.163/min (PAYG) · V3.3 evidence review · Voice Agent Standard PAYG WebSocket connection minutes; other tiers/BYO variants differ
Excluded / confirm: Complete cost cannot be established from this reference. Carrier, hosting, model tier and BYO usage prevent a universal full monthly or per-minute ceiling. · BYO model/TTS charges, carrier and customer transport hosting
STT audio minutes, TTS characters and Voice Agent connection minutes are distinct.
Hume AI
VoiceAgent.best recommends evaluating migration options rather than starting a new long-term TTS or EVI API deployment. This is our editorial judgment; replacement compatibility has not been established.
$3/month Starter; included EVI minutes and overage depend on plan · V3.3 evidence review · Starter subscription reference; EVI 40 minutes; external LLM/telephony extra
Excluded / confirm: Complete cost cannot be established from this reference. Selected external LLM, carrier, token/character consumption and overages prevent a complete cost ceiling from monthly minutes alone. · Hume-managed external LLM usage extra; BYO key/custom model paid outside Hume; Twilio separate
Subscription includes TTS/EVI/Voice allowances; overage and managed external LLM usage add cost.
The evidence overlap.
Both records have documented values for Product type, Technical setup, Pricing model, Published numeric pricing, Twilio, Realtime / streaming audio, OpenAI models, Anthropic models, Google models, Bring your model, Interruption controls, Transcripts and additional fields shown in Compare. Matching availability does not measure behavior under your call conditions.
Run the same booking, tool failure and unsuccessful human-transfer cases. Record both outcomes and billable units before signing a deployment agreement.
Review Hume API sunset & migration guidance →