# PolyAI vs Sierra

**Leader by vioscaleAI score:** PolyAI

| Attribute | PolyAI | Sierra |
|---|---|---|
| **vioscaleAI score** | 62.3 (62% (medium)) | 55.3 (44% (low)) |
| content.faq | `[{"answer":"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. It is indexed under Voice AI Agents.","source":"https://poly.ai/pricing","question":"What is PolyAI?","confidence":0.6},{"answer":"PolyAI does not publish its prices. Pricing is quoted on request, across 1 plan (Usage-based), so the figure depends on your seat count and requirements. We record this as a pricing-transparency signal rather than guessing a number. Pricing changes often, so verify at source before relying on it.","source":"https://poly.ai/pricing","question":"How much does PolyAI cost?","confidence":0.6},{"answer":"PolyAI supports the web and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.","source":"https://poly.ai/pricing","question":"What platforms does PolyAI support?","confidence":0.6},{"answer":"We have only confirmed a cloud / SaaS deployment for PolyAI, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.","source":"https://poly.ai/pricing","question":"Can PolyAI be self-hosted?","confidence":0.6},{"answer":"We have confirmed 5 integrations for PolyAI, including ModMed, Epic, OpenTable, Stripe and GitHub. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://poly.ai/pricing","question":"What does PolyAI integrate with?","confidence":0.6},{"answer":"We have independently confirmed SOC 2, ISO 27001, HIPAA and GDPR for PolyAI. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as PolyAI not holding them. Always confirm compliance directly before you rely on it.","source":"https://poly.ai/blog/glba-compliance-ai","question":"What security certifications does PolyAI have?","confidence":0.7}]` | `[{"answer":"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. It is indexed under Voice AI Agents.","source":"https://sierra.ai/resources/podcasts/bret-taylor-of-sierra-on-ai-agents-outcome-based-pricing-and-the-openai-board","question":"What is Sierra?","confidence":0.6},{"answer":"Sierra does not publish its prices. Pricing is quoted on request, so the figure depends on your seat count and requirements. We record this as a pricing-transparency signal rather than guessing a number. Pricing changes often, so verify at source before relying on it.","source":"https://sierra.ai/resources/podcasts/bret-taylor-of-sierra-on-ai-agents-outcome-based-pricing-and-the-openai-board","question":"How much does Sierra cost?","confidence":0.6},{"answer":"We have confirmed browser-based access to Sierra. That is the extent of what we could verify from public sources, so it may well offer desktop or mobile clients we have not indexed.","source":"https://sierra.ai/resources/podcasts/bret-taylor-of-sierra-on-ai-agents-outcome-based-pricing-and-the-openai-board","question":"What platforms does Sierra support?","confidence":0.6},{"answer":"We have only confirmed a cloud / SaaS deployment for Sierra, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.","source":"https://sierra.ai/resources/podcasts/bret-taylor-of-sierra-on-ai-agents-outcome-based-pricing-and-the-openai-board","question":"Can Sierra be self-hosted?","confidence":0.6},{"answer":"We have confirmed 5 integrations for Sierra, including ChatGPT, Voice, Email, SMS and WhatsApp. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://sierra.ai/resources/podcasts/bret-taylor-of-sierra-on-ai-agents-outcome-based-pricing-and-the-openai-board","question":"What does Sierra integrate with?","confidence":0.6},{"answer":"We have independently confirmed SOC 2, ISO 27001, HIPAA and GDPR for Sierra. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Sierra not holding them. Always confirm compliance directly before you rely on it.","source":"https://sierra.ai/fr/product/trust-and-reliability","question":"What security certifications does Sierra have?","confidence":0.7},{"answer":"Sierra is available worldwide. Its primary market is the United States. The vendor is headquartered in the United States.","source":"https://sierra.ai/resources/podcasts/bret-taylor-of-sierra-on-ai-agents-outcome-based-pricing-and-the-openai-board","question":"Where is Sierra available?","confidence":0.75}]` |
| deployment.options | `{"cloud":true}` | `{"cloud":true}` |
| description.long | An enterprise platform for designing, building, and running AI voice agents that handle customer conversations across multiple channels including voice, SMS, and chat, with pre-built integrations and low-latency dialog models. | Sierra enables businesses to create and deploy conversational AI agents across voice, chat, email, SMS, and other channels. The platform uses an outcome-based pricing model where customers pay based on business results delivered rather than traditional fixed fees. |
| features.capabilities | `{"soc2_type_ii":true,"pricing_model":"per_minute_usage_based","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 | 130 | 6 |
| integrations.list | `[{"name":"ModMed"},{"name":"Epic","native":true,"category":"healthcare","direction":"bidirectional"},{"name":"OpenTable","native":true,"category":"booking","direction":"bidirectional"},{"name":"Stripe","native":true,"category":"payments","direction":"outbound"},{"name":"GitHub","native":true,"category":"development","direction":"inbound"},{"name":"Amazon Web Services","native":true},{"name":"Five9","native":true,"category":"telephony","direction":"bidirectional"},{"name":"NICE","native":true,"category":"telephony","direction":"bidirectional"},{"name":"Salesforce","native":true,"category":"crm","direction":"bidirectional"},{"name":"Twilio","native":true,"category":"telephony","direction":"bidirectional"},{"name":"Verizon Business","native":true,"category":"telephony","direction":"bidirectional"},{"name":"Zendesk","native":true,"category":"crm","direction":"bidirectional"},{"name":"GoTo","native":true,"category":"telephony","direction":"bidirectional"}]` | `[{"name":"ChatGPT"},{"name":"Chat"},{"name":"Voice"},{"name":"Email"},{"name":"SMS"},{"name":"WhatsApp"}]` |
| market.availability | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"primaryMarkets":[],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"cli":true,"web":true}` | `{"web":true}` |
| pricing | `{"type":"usage","plans":[{"free":false,"name":"Usage-based","features":["24/7 support with web ticket portal and emergency phone line","99.9% SLA uptime guarantee","24/7 data infrastructure with load balancing","Regular audits and third-party penetration testing","Latest system features and upgrades","SOC 2, ISO 27001, HIPAA, GDPR, PCI DSS compliance standard"],"description":"Per-minute pricing model for voice agent usage","contactSales":true}],"summary":"Usage-based pricing per minute of voice agent usage","currency":"USD","freeTier":false,"sourceUrl":"https://poly.ai/pricing","retrievedAt":"2026-09-10T09:07:01.831Z"}` | `{"summary":"Outcome-based pricing model (specific tiers not publicly documented)","sourceUrl":"https://sierra.ai/resources/podcasts/bret-taylor-of-sierra-on-ai-agents-outcome-based-pricing-and-the-openai-board","retrievedAt":"2026-09-22T13:51:11.002Z"}` |
| pricing.free_tier | no | - |
| pricing.model | commercial | commercial |
| pricing.price_level | unknown | unknown |
| pricing.transparent | no | no |
| reliability.sla_pct | 99.9 | - |
| security.certifications | `[{"name":"SOC 2 Type II","level":"Type II","status":"active"},{"name":"ISO 27001","status":"active"},{"name":"PCI DSS","status":"active"}]` | `[{"name":"PCI-DSS Level 1","level":"Level 1","status":"active"},{"name":"ISO 27001","status":"active"},{"name":"ISO 42001","status":"active"}]` |
| security.fedramp | - | yes |
| security.gdpr | yes | yes |
| security.hipaa | yes | yes |
| security.iso27001 | yes | yes |
| security.pci | yes | yes |
| security.soc2 | yes | yes |
| security.trust_center | https://poly.ai/security | https://sierra.ai/de/product/trust-and-reliability |

## 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 | Per minute usage based | - |

*Source: vioscaleAI. Generated 2026-10-16T18:31:20.203Z. "-" = undocumented, not absent.*