# PolyAI vs Sierra

**Leader by Vioscale score:** Sierra

| Attribute | PolyAI | Sierra |
|---|---|---|
| **Vioscale score** | 47.1 (60% (medium)) | 62.3 (41% (low)) |
| deployment.options | `{"cloud":true,"on_prem":true,"self_hosted":true}` | `{"cloud":true}` |
| description.long | A cloud-based platform that enables organizations to build, deploy, and manage conversational voice AI agents for customer interactions. Provides both visual no-code builder and developer SDK options, with built-in compliance, security, and integration capabilities. | A platform for building and deploying AI agents across chat, voice, email, SMS, WhatsApp, and ChatGPT. Includes a no-code agent builder, conversation analytics, and automated agent optimization capabilities with enterprise-grade security and compliance. |
| features.capabilities | `{"soc2_type_ii":true,"deployment_model":"no_code_saas_platform","post_call_transcription_and_crm_sync":true,"dynamic_mid_call_api_function_execution":true,"emotion_prosody_and_custom_voice_cloning":true,"live_human_handoff_and_call_transfer_logic":true,"inbound_reception_and_ivr_routing_replacement":true,"hipaa_compliance_for_medical_appointment_setting":true,"sub_second_latency_and_interruption_barget_in_handling":true}` | `{"deployment_model":"no_code_saas_platform","post_call_transcription_and_crm_sync":true,"live_human_handoff_and_call_transfer_logic":true,"hipaa_compliance_for_medical_appointment_setting":true}` |
| integrations.count | 1 | 6 |
| integrations.list | `[{"name":"ModMed"}]` | `[{"name":"ChatGPT"},{"name":"Chat"},{"name":"Voice"},{"name":"Email"},{"name":"SMS"},{"name":"WhatsApp"}]` |
| market.availability | `{"hqCountry":"GB","primaryMarkets":["GB","US","EU"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"hqCountry":"US","primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"cli":true,"web":true}` | `{"web":true}` |
| pricing | `{"type":"usage","summary":"Per-minute usage pricing; custom quotes required","currency":"USD","freeTier":false,"sourceUrl":"https://poly.ai/pricing","retrievedAt":"2026-08-25T21:46:22.147Z"}` | `{"type":"quote","summary":"Outcome-based pricing model where payment is tied to business outcomes delivered","currency":"USD","sourceUrl":"https://sierra.ai/resources/podcasts/bret-taylor-of-sierra-on-ai-agents-outcome-based-pricing-and-the-openai-board","retrievedAt":"2026-08-21T11:09:57.621Z"}` |
| pricing.free_tier | no | - |
| pricing.model | commercial | quote |
| pricing.price_level | unknown | unknown |
| pricing.transparent | no | yes |
| reliability.sla_pct | 99.9 | - |
| security.fedramp | - | yes |
| security.gdpr | yes | yes |
| security.hipaa | yes | yes |
| security.iso27001 | yes | yes |
| security.pci | yes | yes |
| security.soc2 | yes | yes |

## Capabilities (Voice AI Agents)

| Capability | PolyAI | Sierra |
|---|:--:|:--:|
| **Capabilities** |  |  |
| Deployment model | No code saas platform | No code saas platform |
| Sub second latency and interruption barget in handling | ✓ | - |
| Dynamic mid call API function execution | ✓ | - |
| Live human handoff and call transfer logic | ✓ | ✓ |
| Emotion prosody and custom voice cloning | ✓ | - |
| Inbound reception and ivr routing replacement | ✓ | - |
| Outbound dialing and campaign management | - | - |
| Post call transcription and CRM sync | ✓ | ✓ |
| Voicemail detection and answering machine drops | - | - |
| Twilio vonage bring your own carrier byoc support | - | - |
| SOC2 type ii | ✓ | - |
| HIPAA compliance for medical appointment setting | ✓ | ✓ |
| Pricing model | - | - |

*Source: Vioscale. Generated 2026-09-01T16:33:00.061Z. "-" = undocumented, not absent.*