Sierra AI vs Hey Rosie Comparison (2025)

Sierra AI
Starting at $2 per successful outcome
Sierra AI delivers a comprehensive conversational platform with multi-channel voice and chat, real-time analytics, and enterprise-grade security out of the box. But you won’t find a price list anywhere—expect to negotiate usage-based fees that climb steeply as you add advanced features or extra channels. Its “build once, run everywhere” Agent OS sounds neat, but customizing flows and integrating with legacy systems often requires dedicated engineering time. The command center offers deep controls, yet teams frequently find it overengineered for routine tasks and in need of training to manage. And despite claims of empathetic, human-like responses, at scale the agents can still stumble over accents or complex queries, leaving gaps that demand human intervention.
Key Metrics
Latency
800 ms
Automation
60%
Integrations
30
Onboarding
7 days

Sierra AI
Score
79
Latency
800 ms
Automation
60%
Integrations
30
Onboarding
7 days
Cost
Low
HIPAA Compliant
Yes

Hey Rosie
Score
57
Latency
950 ms
Automation
60%
Integrations
1
Onboarding
1 days
Cost
Low
HIPAA Compliant
No
Sierra AI
Sierra AI delivers a comprehensive conversational platform with multi-channel voice and chat, real-time analytics, and enterprise-grade security out of the box. But you won’t find a price list anywhere—expect to negotiate usage-based fees that climb steeply as you add advanced features or extra channels. Its “build once, run everywhere” Agent OS sounds neat, but customizing flows and integrating with legacy systems often requires dedicated engineering time. The command center offers deep controls, yet teams frequently find it overengineered for routine tasks and in need of training to manage. And despite claims of empathetic, human-like responses, at scale the agents can still stumble over accents or complex queries, leaving gaps that demand human intervention.
Hey Rosie
Rosie provides an entry‑level virtual receptionist service aimed at small teams. Setup is straightforward—connect a phone line and run a short wizard that draws context from your website or Google Business profile. The base plan costs $49 for 250 minutes, with overage billed at $0.25 per minute; higher‑priced tiers add live call transfers and more routing controls.
The agent speaks English and Spanish, can handle simultaneous calls, and sends a text or email summary after each conversation. Workflows beyond basic triage generally run through a single native integration (Zapier), which may suffice for simple CRM updates but can feel restrictive for more complex processes. Spam calls are detected quickly, though the minutes still count toward usage. Overall, Rosie is suitable for basic call answering and lead capture, but teams that require deeper scheduling, compliance safeguards, or custom integrations may need to look elsewhere.
The agent speaks English and Spanish, can handle simultaneous calls, and sends a text or email summary after each conversation. Workflows beyond basic triage generally run through a single native integration (Zapier), which may suffice for simple CRM updates but can feel restrictive for more complex processes. Spam calls are detected quickly, though the minutes still count toward usage. Overall, Rosie is suitable for basic call answering and lead capture, but teams that require deeper scheduling, compliance safeguards, or custom integrations may need to look elsewhere.
Full Comparison
Vendor | Score | Latency | Automation | Integrations | Cost | Action |
---|---|---|---|---|---|---|
OpenCall.ai $0.10/ minute | 93 | 700 ms | 76% | 2000 | Low | |
![]() Retell.ai $0.07 – 0.08 /min | 82 | 950 ms | 55% | 25 | Low | |
![]() Sierra AI $2 per successful outcome | 79 | 800 ms | 60% | 30 | Low | |
![]() PolyAI $0.25 /min (example case study) | 67 | 1700 ms | 72% | 25 | Medium | |
![]() Bland AI $0.09/min | 66 | 1100 ms | 50% | 15 | Low | |
![]() Phonely $396 (yearly) | 61 | 1200 ms | 52% | 17 | Medium | |
![]() Hey Rosie $49/mo (250 min) + $0.25/min | 57 | 950 ms | 60% | 1 | Low | |
![]() Smith.ai $3.25 /call (Starter 30 calls @ $97.50/mo) | 55 | 2300 ms | 40% | 30 | Medium | |
![]() 8x8 XCaaS $60 per seat per month | 49 | 250 ms | 50% | 15 | Medium | |
![]() CloudTalk $25 – $50 /user/mo | 47 | 23 ms | 40% | 500 | Low | |
Synthflow AI $0.08 /min (Growth) | 20 | 2300 ms | 45% | 20 | Low | |
![]() Balto.ai $100 / seat /mo | 12 | 100 ms | 0% | 40 | High |