Sierra AI vs Bland AI 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

Bland AI
Score
66
Latency
1100 ms
Automation
50%
Integrations
15
Onboarding
1 days
Cost
Low
HIPAA Compliant
Yes
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.
Bland AI
Bland AI charges $0.09 per minute plus a monthly fee, offering basic phone automation with a minimalist interface. But it only supports English by default, only integrates with Twilio, and charges extra for features like voice cloning or concurrency. While it’s pitched as developer-friendly, much of the work—like setting up context management or error handling—falls on you. The voice often sounds flat or overly scripted, and the system can struggle to handle complex flows without dropping threads. It’s an entry-level solution that quickly shows its limitations.
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 |