V
VPolyAI vs Siena AI
Pricing, features, platforms and who each one suits — side by side.
P
Choose PolyAI if…
- you need an API to build on
- you want to trial it before paying
- you're in its core audience: enterprise contact centers, customer service leaders
S
Choose Siena AI if…
- you work on Slack
- you're in its core audience: consumer brands, e-commerce customer experience teams
Side by side
Feature PolyAI Siena AI
Pricing modelContact for pricingPaid
Starting price—$750/mo
Free plan
Free trial
API
Open source
Security and compliance—SOC 2 Type II, GDPR
PlatformsWeb, APIWeb, Slack
CategoryVoice AgentsCustomer Support
CompanyPolyAI LtdSiena Labs, Inc. · United States
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 Siena AI
- Automated order updates, return labels, refunds and replacements
- Subscription skip, pause and swap handling with upsell suggestions
- Shopping Agent for product recommendations
- Social Agent for product questions and community moderation
- Copilot for drafting on-brand replies and translations
- AI Personas, guardrails and granular policy controls
- Collaborative AI Routing that explains each handoff
- Siena Docs knowledge base with a branded public help center
Their home pages
What each vendor shows first: the pitch, the plans and the sign-up.
PolyAI · poly.ai
Siena AI · siena.cxWhat 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
Siena AI
Platform fee$750/month
Automation Pack$0.90 per ticket automated
Support & ImplementationPricing on request
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
Siena AI
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
Siena AI
- Integrates with six named helpdesks, including Zendesk, Gorgias and Intercom
- Published pricing: $750/month platform fee plus $0.90 per automated ticket
- Siena Docs is included in the plan at no extra cost
- Platform fee includes an unlimited sandbox
- No free plan or free trial is mentioned on the pricing page
- Support and implementation pricing is not published and must be requested
- Per-ticket charges come on top of the $750 monthly platform fee
- No mobile app is listed
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
S
SS
Contact
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
Facts from each vendor's public pages, prices checked Oct 31, 2026. Editorial policy