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Sierra vs Voiceflow
Side-by-side comparison of features, pricing, and ratings
Build, launch, and scale AI agents for customer support and lead generation, no code required.
Visit WebsitePricing
Paid
Contact Sales
Plans
Custom
$0
$50/editor/mo
Custom
Popularity
3.9k views
6.3k views
Skill Level
Advanced
Intermediate
API Available
Platforms
WebAPI
WebAPI
Categories
💬 Customer Support
💬 Customer Support🤖 Automation & Agents
Features
Ghostwriter agent-building agent from SOPs and transcripts
Multichannel deployment: chat, SMS, WhatsApp, email, voice, ChatGPT
Agent memory for real-time personalized context
Customer data integration from systems of record
Recommendations engine for agent decisioning
Proactive engagement with next best actions
Insights Explorer for deep conversation analytics
Monitors for proactive attention to flagged conversations
Multivariate experiments for conversation design
Observability of tool calls, knowledge lookups, latency
Outcome-based pricing (per resolved conversation)
Built-in guardrails and trust/compliance
Multilingual agent support
Voice transcription routing across providers (70+ languages)
FedRAMP High certification (June 2026)
No-code visual workflow builder for conversational AI
Omnichannel deployment: web, phone, mobile
Real-time collaboration for team design
Agentic Context Engine for complex conversations
Low-latency voice support (500ms)
High throughput: 300k messages per minute
Integrated prototyping and NLU modeling
API and code editor for developer customization
Separate workspaces for team organization
Scalable to 10,000+ live agents in production
Caller ID passthrough for phone calls
Transcript filtering by workflow, playbook, or tool
Organization-level usage breakdown across workspaces
Merge conflict awareness for version control
Personas for testing conversations with preset values
Integrations
Salesforce
Zendesk
Genesys
Chat
SMS
WhatsApp
Email
Voice
ChatGPT
Web embed widgets
Phone integration
Flexible API for custom interfaces
Slack
Intercom
HubSpot
Shopify
WordPress