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Side-by-side features, use cases and pricing — because the right pick depends on your job and budget, not just the ranking.
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Voiceflow
✓ verifiedFreemium
Enterprise platform to build, launch and scale conversational and voice AI agents for support across web, phone and apps.
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Sierra
✓ verifiedPaid
Enterprise conversational AI platform, founded by former Google/Salesforce leaders, for building customer-facing AI agents across channels.
326K visits/mo
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Glassix
✓ verifiedPaid
AI-native contact center that resolves customer inquiries across chat, voice and social channels for support teams.
271K visits/mo752 saves
Pricing
No public pricing
No public pricing
Starter: $49/user/mo
Growth: $65/user/mo (annual)
Free trial available
Core features
- ✦Visual agent builder (agentic and deterministic workflows)
- ✦Omnichannel deployment across web, phone and mobile
- ✦LLM-powered observability and evaluations
- ✦No model lock-in / bring your own LLM
- ✦API integrations and functions
- ✦SOC-2, ISO 27001, GDPR and HIPAA compliance
- ✦AI agent builder from SOPs/transcripts (Ghostwriter)
- ✦Multi-channel deployment (chat, voice, SMS, email)
- ✦Conversation analytics and monitoring
- ✦A/B testing of conversation design
- ✦Agent memory and customer data integration
- ✦Outcome-based pricing model
- ✦Omnichannel inbox for chat, email, social and voice
- ✦AI agents and chatbots with human co-handling
- ✦CrystalVoice AI voice channel
- ✦Automation and workflow routing
- ✦Reporting and real-time dashboards
- ✦Mobile agent app and API
Use cases
- →Automating customer support
- →Lead generation and qualification agents
- →Voice and call-center automation
- →Prototyping and collaborating on conversation design
- →Large brands automating customer support across channels
- →Enterprises building agents without heavy engineering support
- →Companies personalizing AI interactions using CRM data
- →Automate first-line customer support
- →Unify messaging across channels in one inbox
- →Deploy chatbots for 24/7 self-service
- →Scale support for e-commerce and enterprise teams
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