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Comparison LabCompare 27 voice AI platforms and components across seven buying contexts, with sourced capabilities, current price captures and visible unknowns.Voice AI Price Index: prices, evidence and historyUnderstand the complete voice-agent cost stack: models, voice, transcription, telephony, subscriptions, capacity and add-ons.Know the cost before the first callEstimate monthly voice-agent costs, AI minutes, setup expenses and volume scenarios using your own transparent assumptions.AI voice agents for dentalAppointments, rescheduling and after-hours calls—with a person ready for clinical questions. Explore call flows, safe automation, integrations, tests and cost considerations.

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ServiceAgent vs Synthflow

ServiceAgent is positioned as a home-service front-office product combining call handling with business administration. Synthflow is positioned as a visual voice-agent workflow platform sold through scoped deployments and partner

The decision in context

ServiceAgent is positioned as a home-service front-office product combining call handling with business administration. Synthflow is positioned as a visual voice-agent workflow platform sold through scoped deployments and partner delivery. Start by deciding who owns the missing layers, then inspect the documented differences below.

6 jointly documented catalog fields. This measures evidence coverage, not equivalent quality or an overall winner.

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Test opening hours, booking conflicts and an unanswered transfer.

2 of 4 slots
ServiceAgentSynthflow
Decision signals / differences first

Start where the records differ.

6 of 8 priority fields differ

Values and evidence states are compared together. Shared facts follow the differences; Unknown never means No.

Selected platforms: buyer-critical differences before detailed dimensions
Decision pointServiceAgentSynthflow
Billing modelDifferent records
character-creditConditional · 2026-09-28
custom-sales-ledVerified Yes · 2026-09-28
Billing unitDifferent records
Action credits;15credits/AI voice minute,2/SMS segment,5/ad creative,1/review replyVerified Yes · 2026-09-28
Contract minimum per year; call seconds aggregate to minutes; five AI chat messages count as one usage minuteVerified Yes · 2026-09-28
Bring your telephonyDifferent records
UnknownUnknown after research · 2026-09-28Documented product/configuration only; see research notes
YesConditional · 2026-09-28Documented product/configuration only; see research notes · Enterprise/custom telephony agreement
Bring your modelDifferent records
UnknownUnknown after research · 2026-09-28Documented product/configuration only; see research notes
YesConditional · 2026-09-28Documented product/configuration only; see research notes · BYOK-enabled account
Warm transferDifferent records
YesVendor claim · 2026-09-28Vendor-described receptionist; current waitlist
YesVerified Yes · 2026-09-28Documented product/configuration only; see research notes
HIPAA pathDifferent records
UnknownUnknown after research · 2026-09-28Documented product/configuration only; see research notes
YesVendor claim · 2026-09-28PHI under contract and HIPAA Setting · United States
Your requirements & next steps
Carried from your shortlist

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Ready-made / AI receptionist · Strict evidence mode

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Unknown ≠ No
Evidence, side by sideNo benchmark scores
ServiceAgentFull Platforms
SynthflowFull Platforms
Pricing model
ServiceAgent
character-creditConditional · 2026-09-28

Monthly bundle plus action/telecom credits;15credits/AI voice minute. Not a single all-in minute price.

Synthflow
custom-sales-ledVerified Yes · 2026-09-28

Sales-ledcontract;call usage metered but exact unitrates and allowances negotiated.

Headline / base price
ServiceAgent
Launch $0; paid Core $49/month or $39/month billed yearlyVerified Yes · 2026-09-28

Growth119monthly/95annual-equivalent;Franchise349/279. Display separates monthly and annual commitment.

Synthflow
Enterprise contracts from $30,000 annuallyVerified Yes · 2026-09-28

Starting commitment; complete contract cost remains unknown.

Billing unit
ServiceAgent
Action credits;15credits/AI voice minute,2/SMS segment,5/ad creative,1/review replyVerified Yes · 2026-09-28

Top-up credit price is$0.02–$0.04; platform fees, included credits and other actions must be modeled separately.

Synthflow
Contract minimum per year; call seconds aggregate to minutes; five AI chat messages count as one usage minuteVerified Yes · 2026-09-28

Rates,allowances andsimulationbilling come fromaccountagreement.

Platform fee
ServiceAgent
0/49/119/349 USD monthly (Launch/Core/Growth/Franchise)Verified Yes · 2026-09-28

Annual equivalents39/95/279requireyearlybilling;location/ad/paymentfees separate.

Synthflow
UnknownUnknown after research · 2026-09-28

No complete current public contract rate and allowance schedule was established.

Documented product/configuration only; see research notes · Contract-specific
Included usage
ServiceAgent
0/2000/6000/20000action credits per monthVerified Yes · 2026-09-28

Different activities draw from credits; do not convert the entire allowance to guaranteed calling minutes.

Synthflow
UnknownUnknown after research · 2026-09-28

No complete current public contract rate and allowance schedule was established.

Documented product/configuration only; see research notes · Contract-specific
Overage
ServiceAgent
$0.02–$0.04 per separately purchased creditVerified Yes · 2026-09-28

AI voice15credits/minute; top-up package and selected plan determine cost.

Synthflow
UnknownUnknown after research · 2026-09-28

No complete current public contract rate and allowance schedule was established.

Documented product/configuration only; see research notes · Contract-specific
Pass-through costs
ServiceAgent
SMS, campaigns and payment/other service fees varyVerified Yes · 2026-09-28

Reviewed current public offer; retain original billing scope and units.

Documented product/configuration only; see research notes · Core published offer; account availability requires confirmation
Synthflow
Account agreement and carrier/add-on terms require quoteVerified Yes · 2026-09-28

Reviewed current public offer; retain original billing scope and units.

Documented product/configuration only; see research notes · Contract-specific
Free offer
ServiceAgent
Launch platform plan $0; no included credits; current waitlistVerified Yes · 2026-09-28

Reviewed current public offer; retain original billing scope and units.

Core published offer; account availability requires confirmation
Synthflow
UnknownUnknown after research · 2026-09-28

No complete current public contract rate and allowance schedule was established.

Contract-specific
Complete cost ceiling
ServiceAgent
UnknownUnknown after research · 2026-09-28

Variable credit purchase tiers, nonvoice consumption, fees and current waitlist prevent a guaranteed all-in voice rate.

Documented product/configuration only; see research notes · Core published offer; account availability requires confirmation
Synthflow
UnknownUnknown after research · 2026-09-28

No complete current public contract rate and allowance schedule was established.

Documented product/configuration only; see research notes · Contract-specific
What remains unresolved
ServiceAgent
Variable credit purchase tiers, nonvoice consumption, fees and current waitlist prevent a guaranteed all-in voice rate.Verified Yes · 2026-09-28

Research conclusion about cost completeness, not a vendor capability.

Documented product/configuration only; see research notes · Core published offer; account availability requires confirmation
Synthflow
No complete current public contract rate and allowance schedule was established.Verified Yes · 2026-09-28

Research conclusion about cost completeness, not a vendor capability.

Documented product/configuration only; see research notes · Contract-specific

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.

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What to verify together.

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

character-creditConditional · 2026-09-28

Monthly bundle plus action/telecom credits;15credits/AI voice minute. Not a single all-in minute price.

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Synthflow

Do not apply old self-service rates to a new contract.

Enterprise contracts from $30,000 annually · V3.3 evidence review · Enterprise contract starting annual commitment; scoped quote required

Excluded / confirm: Complete cost cannot be established from this reference. No complete current public contract rate and allowance schedule was established. · Account agreement and carrier/add-on terms require quote

custom-sales-ledVerified Yes · 2026-09-28

Sales-ledcontract;call usage metered but exact unitrates and allowances negotiated.

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The evidence overlap.

Both records have documented values for Product type, Technical setup, Zapier, 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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Editorial index gate: noindex-low-intent. Browseable utility pair. Independent demand evidence and unique editorial review have not passed the index gate.