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Hermes vs Hume AI
Hermes is positioned as an agency operations layer bundling voice providers, client workspaces and billing. Hume AI is positioned as hume TTS and EVI API sunset: announced access end November 13, 2026 at 05:01 UTC. Retained for hi
Hermes is positioned as an agency operations layer bundling voice providers, client workspaces and billing. 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.
Full Platforms and Voice Engines are different product categories. An underlying engine or framework is not a complete substitute for a deployed agent workflow.
6 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 | Hermes | Hume AI |
|---|---|---|
| Billing unitDifferent records | month | Monthly subscription + EVI minutes / TTS characters / supplemental LLM usage |
| Bring your telephonyDifferent records | Unknown | Yes |
| Bring your modelDifferent records | Unknown | Yes |
| HIPAA pathDifferent records | Unknown | Yes |
| WebhooksDifferent records | YesAPI / webhook | YesAPI / webhook |
| Billing modelShared state | monthly-bundle | monthly-bundle |
Your requirements & next steps
Your requirements
Ready-made / AI receptionist · Strict evidence mode
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Reviewed current public offer; retain original billing scope and units.
Subscription includes TTS/EVI/Voice allowances; overage and managed external LLM usage add cost.
Reviewed current public offer; retain original billing scope and units.
Free plan exists; paid entry is not a complete phone-call bill.
Reviewed current public offer; retain original billing scope and units.
Incompatible product allowances are not collapsed into one all-in minute price.
Reviewed current public offer; retain original billing scope and units.
First-month Creator promotion is separate from regular price; Enterprise custom.
Reviewed current public offer; retain original billing scope and units.
Plan-scoped EVI allowance; does not include every third-party carrier/model charge.
Official overage rates conflict, messaging pass-through varies and beta account terms need confirmation.
TTS characters, EVI minutes and supplemental model usage remain separate.
Reviewed current public offer; retain original billing scope and units.
Official overage rates conflict, messaging pass-through varies and beta account terms need confirmation.
Not yet researched against this buyer-critical field standard.
Official overage rates conflict, messaging pass-through varies and beta account terms need confirmation.
Research conclusion about cost completeness, not a vendor capability.
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.
Hermes
The service is advertised as a private beta with public launch pending.
Starter $149/month · V3.3 evidence review · Starter private beta subscription; unresolved overage scope
Excluded / confirm: Complete cost cannot be established from this reference. Official overage rates conflict, messaging pass-through varies and beta account terms need confirmation. · A2P messaging pass-through and customer billing configuration vary
Reviewed current public offer; retain original billing scope and units.
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, Pricing model, Published numeric pricing, Twilio, Checked within 30 days, Retained price snapshot. 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 →