Compare Lab
Cartesia vs Fish Audio
Cartesia is positioned as speech models for teams assembling a voice stack, with a separate managed-agent product. Fish Audio is positioned as a developer speech API and creative voice workspace; paid TTS usage is metered in UTF-8
Cartesia is positioned as speech models for teams assembling a voice stack, with a separate managed-agent product. Fish Audio is positioned as a developer speech API and creative voice workspace; paid TTS usage is metered in UTF-8 bytes. Start by deciding who owns the missing layers, then inspect the documented differences below.
14 jointly documented catalog fields. This measures evidence coverage, not equivalent quality or an overall winner.
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 | Cartesia | Fish Audio |
|---|---|---|
| Billing unitDifferent records | TTS/STT credits; Managed Agents conversation minutes | TTS: million UTF-8 bytes; ASR: audio hours; Agents: conversation minutes |
| Bring your telephonyDifferent records | Yes | Yes |
| Bring your modelDifferent records | Yes | Yes |
| Warm transferDifferent records | Unknown | Yes |
| HIPAA pathDifferent records | Yes | Unknown |
| Billing modelShared state | component-stack | component-stack |
Your requirements & next steps
Your requirements
Ready-made / AI receptionist · Strict evidence mode
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TTS/STT credit subscriptions and Managed Agents minute charges remain separate.
TTS uses UTF-8 bytes, ASR audio hours, Agents minutes plus carrier/model/add-ons. Multiple products must not share a fabricated normalized unit.
Speech model credits and selected LLM/evaluation charges have separate scope.
Free TTS model and Agents promotional basic LLM scope are separate.
Product-specific units preserved.
Each product keeps its own billing unit.
Plan allowances include separate agent prepayment; do not double-count as universal included voice minutes.
API access; managed numbers have separate rental and enterprise agreement may differ.
Separate credit and agent budgets; no arbitrary cross-product minute conversion.
Real sessions consume balance including relevant carrier/model charges; no monthly included minutes.
Free allowances and product rates are available; old changelog, bandwidth trial and speech volume controls do not establish these current billing terms.
Destination, transfer and selected model affect cost; no complete ceiling.
LLM promotion ends October 1, 2026; quoted model/usage mix determines bill.
Rates have explicit event/destination scope, not a single maximum.
Not yet researched against this buyer-critical field standard.
Not yet researched against this buyer-critical field standard.
Product mix, LLM promotion expiry, carrier routing and other metered components prevent a universal all-in ceiling.
Call mix, destination, transfer time, selected model/token usage and separate speech products prevent a universal complete monthly/minute ceiling.
Product mix, LLM promotion expiry, carrier routing and other metered components prevent a universal all-in ceiling.
Call mix, destination, transfer time, selected model/token usage and separate speech products prevent a universal complete monthly/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.
Cartesia
A speech credit plan is not a complete phone-call bill.
Managed Agents $0.06/min; Cartesia-provided-number telephony $0.014/min · V3.3 evidence review · Managed Agents base rate; carrier/model charges and prepaid plan balances separate
Excluded / confirm: Complete cost cannot be established from this reference. Product mix, LLM promotion expiry, carrier routing and other metered components prevent a universal all-in ceiling. · LLM tokens after promotional coverage; telephony and evaluation usage
TTS/STT credit subscriptions and Managed Agents minute charges remain separate.
Fish Audio
UTF-8 bytes and characters are not interchangeable for multilingual scripts.
TTS $15/M UTF-8 bytes; ASR $0.36/audio hour; Agents $0.06/min + applicable surcharges · V3.3 evidence review · TTS API reference; Voice Agents beta has separate minute-based billing
Excluded / confirm: Complete cost cannot be established from this reference. Call mix, destination, transfer time, selected model/token usage and separate speech products prevent a universal complete monthly/minute ceiling. · Phone destination surcharge, $1.20/month managed number, cold $0.015/min or warm $0.025/min post-transfer, non-basic LLM tokens; BYO carrier separate
TTS uses UTF-8 bytes, ASR audio hours, Agents minutes plus carrier/model/add-ons. Multiple products must not share a fabricated normalized unit.
The evidence overlap.
Both records have documented values for Product type, Technical setup, Pricing model, Published numeric pricing, Free tier, Voice cloning, Realtime / streaming audio, Function / tool calling, Webhooks, Published included concurrency at least, Local number availability, Official product documentation 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.
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