V
VPolyAI vs Synthflow
Pricing, features, platforms and who each one suits — side by side.
P
Choose PolyAI if…
- you want to trial it before paying
- you're in its core audience: enterprise contact centers, customer service leaders
S
Choose Synthflow if…
- you're in its core audience: contact centers, bpos
Side by side
Feature PolyAI Synthflow
Pricing modelContact for pricingContact for pricing
Starting price——
Free plan
Free trial
API
Open source
PlatformsWeb, APIWeb, API
CompanyPolyAI LtdSynthflow AI
Full feature lists
P PolyAI
- Audio-native Dialog-RSN-1 voice model with sub-300ms latency
- Dialog Studio for no-code to full-code agent building
- Voice, SMS, WhatsApp, web chat and email channels
- Guardrails, PII redaction and human-in-the-loop controls
- Test calls, simulated conversations and A/B tests
- Pre-built connectors plus any API or MCP server
- Bring your own carrier over SIP at no charge
- Data residency in US, UK, EU and APAC
S Synthflow
- Inbound and outbound AI phone agents
- Response time under half a second, with interruption handling
- Language switching during a call
- Warm handoff to human agents with full transcript
- Appointment booking, voicemail detection and SMS follow-ups
- 200+ integrations including Salesforce, HubSpot, Zendesk
- Pre-launch testing and staged rollout with approval
- US, EU and Latin America hosting regions
Their home pages
What each vendor shows first: the pitch, the plans and the sign-up.
PolyAI · poly.ai
Synthflow · synthflow.aiWhat you'd pay
The cheapest plan that fits, per month, billed yearly where the plan offers it.
PolyAI
Dialog-RSN-1 API2¢ per connected minute
PlatformCustom
Synthflow
EnterpriseCustom
Price changes we've recorded
We re-read each pricing page every month and log what changed.
PolyAI
- Nov 8, 2026Pricing model: Contact for pricing → Free trial
Synthflow
No changes since we started tracking.
Strengths and limitations
PolyAI
- Published API price of 2¢ per connected minute, billed per second
- $100 free credit for new sign-ups for a limited time
- SOC 2, ISO 27001, PCI DSS and GDPR compliance
- No minimums on platform billing
- Platform pricing requires a sales quote
- API excludes telephony and orchestration
- API limited to 2 concurrent calls until a card is added
Synthflow
- SOC 2 Type II, ISO 27001, PCI DSS and HIPAA BAA compliance
- Works with major phone systems and SIP trunks
- White-label deployment with per-client workspaces
- Retention controls can delete recordings and transcripts after 30 days
- No free plan or trial
- Sold only as an annual enterprise agreement
- No published prices or per-minute rate
- SMS and WhatsApp limited to US workspaces
More comparisons
Other options to consider
VV
Free, from $29/mo
V
Developer platform to build, test and deploy voice AI agents for phone calls
Voice AgentsFree planAPI
B
BB
Free, from $299/mo
R
R
Free trial
R
Build, deploy and monitor AI voice agents that answer and place phone calls
Voice AgentsAPI
Z
ZZ
Free trial
I
IAI customer agent that resolves support, sales and ecommerce conversations
From $49.50/mo
I
From $49.50/mo
I
AI customer agent that resolves support, sales and ecommerce conversations
Customer SupportAPI
G
GG
From $10/mo
Facts from each vendor's public pages, prices checked Nov 8, 2026. Editorial policy