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Cartesia vs ServiceAgent
Cartesia is positioned as speech models for teams assembling a voice stack, with a separate managed-agent product. ServiceAgent is positioned as a home-service front-office product combining call handling with business administrat
Cartesia is positioned as speech models for teams assembling a voice stack, with a separate managed-agent product. ServiceAgent is positioned as a home-service front-office product combining call handling with business administration. Start by deciding who owns the missing layers, then inspect the documented differences below.
Voice Engines and Full Platforms 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.
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 | ServiceAgent |
|---|---|---|
| Billing modelDifferent records | component-stack | character-credit |
| Billing unitDifferent records | TTS/STT credits; Managed Agents conversation minutes | Action credits;15credits/AI voice minute,2/SMS segment,5/ad creative,1/review reply |
| Bring your telephonyDifferent records | Yes | Unknown |
| Bring your modelDifferent records | Yes | Unknown |
| Warm transferDifferent records | Unknown | Yes |
| HIPAA pathDifferent records | Yes | Unknown |
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.
Monthly bundle plus action/telecom credits;15credits/AI voice minute. Not a single all-in minute price.
Speech model credits and selected LLM/evaluation charges have separate scope.
Growth119monthly/95annual-equivalent;Franchise349/279. Display separates monthly and annual commitment.
Product-specific units preserved.
Top-up credit price is$0.02–$0.04; platform fees, included credits and other actions must be modeled separately.
Plan allowances include separate agent prepayment; do not double-count as universal included voice minutes.
Annual equivalents39/95/279requireyearlybilling;location/ad/paymentfees separate.
Separate credit and agent budgets; no arbitrary cross-product minute conversion.
Different activities draw from credits; do not convert the entire allowance to guaranteed calling minutes.
Free allowances and product rates are available; old changelog, bandwidth trial and speech volume controls do not establish these current billing terms.
AI voice15credits/minute; top-up package and selected plan determine cost.
LLM promotion ends October 1, 2026; quoted model/usage mix determines bill.
Reviewed current public offer; retain original billing scope and units.
Not yet researched against this buyer-critical field standard.
Reviewed current public offer; retain original billing scope and units.
Product mix, LLM promotion expiry, carrier routing and other metered components prevent a universal all-in ceiling.
Variable credit purchase tiers, nonvoice consumption, fees and current waitlist prevent a guaranteed all-in voice rate.
Product mix, LLM promotion expiry, carrier routing and other metered components prevent a universal all-in ceiling.
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.
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.
ServiceAgent
The public site still carries a launch-soon banner; confirm availability before migrating calls.
Launch $0; paid Core $49/month or $39/month billed yearly · V3.3 evidence review · Core monthly subscription and action-credit allowance; current waitlist, not general availability
Excluded / confirm: Complete cost cannot be established from this reference. Variable credit purchase tiers, nonvoice consumption, fees and current waitlist prevent a guaranteed all-in voice rate. · SMS, campaigns and payment/other service fees vary
Monthly bundle plus action/telecom credits;15credits/AI voice minute. Not a single all-in minute price.
The evidence overlap.
Both records have documented values for Product type, Technical setup, Published numeric pricing, Webhooks, 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.
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