Ultravox (formerly Fixie.ai) vs Dify

Detailed side-by-side comparison to help you choose the right tool

Ultravox (formerly Fixie.ai)

🟡Low Code

Voice AI

Real-time, speech-native voice AI platform that processes audio directly without text conversion, enabling fast, natural voice conversations for AI agents with sub-second latency and preservation of paralinguistic signals.

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Starting Price

Free
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Dify

🟡Low Code

Automation & Workflows

Dify is an open-source platform for building AI applications that combines visual workflow design, model management, and knowledge base integration in one tool.

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Starting Price

Free
Full ReviewVisit Site

Feature Comparison

Scroll horizontally to compare details.

FeatureUltravox (formerly Fixie.ai)Dify
CategoryVoice AIAutomation & Workflows
Pricing Plans8 tiers4 tiers
Starting PriceFreeFree
Key Features
    • • Workflow Runtime
    • • Tool and API Connectivity
    • • State and Context Handling

    Ultravox (formerly Fixie.ai) - Pros & Cons

    Pros

    • ✓Industry-leading speech processing with 97% accuracy on Big Bench Audio benchmarks
    • ✓Sub-second response times enable natural, real-time voice conversations
    • ✓Speech-native architecture preserves tone and emotional context lost in text conversion
    • ✓Developer-friendly APIs and SDKs for rapid voice agent deployment
    • ✓Built-in telephony integrations eliminate complex third-party setup requirements

    Cons

    • ✗Newer platform with smaller community compared to established voice AI solutions
    • ✗Speech-native approach requires consistent audio quality for optimal performance
    • ✗JavaScript/TypeScript focus may not align with Python-heavy ML teams
    • ✗Limited offline processing capabilities due to cloud-based speech models

    Dify - Pros & Cons

    Pros

    • ✓Most comprehensive open-source LLMOps platform combining all AI development needs
    • ✓Production-grade RAG pipeline with advanced document processing and chunking
    • ✓Complete self-hosting option with no enterprise feature paywalls
    • ✓Visual interface accessible to non-developers while maintaining technical depth
    • ✓Built-in quality monitoring and evaluation systems for production applications

    Cons

    • ✗Docker deployment complexity requires DevOps knowledge and significant resources
    • ✗Platform approach limits flexibility for highly customized agent architectures
    • ✗Visual workflow builder becomes unwieldy for very complex multi-step processes
    • ✗Smaller plugin ecosystem compared to established automation platforms

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    🔒 Security & Compliance Comparison

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    Security FeatureUltravox (formerly Fixie.ai)Dify
    SOC2——
    GDPR——
    HIPAA——
    SSO—✅ Yes
    Self-Hosted—✅ Yes
    On-Prem—✅ Yes
    RBAC—✅ Yes
    Audit Log—✅ Yes
    Open Source—✅ Yes
    API Key Auth—✅ Yes
    Encryption at Rest—✅ Yes
    Encryption in Transit—✅ Yes
    Data Residency——
    Data Retention—configurable
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    Ready to Choose?

    Read the full reviews to make an informed decision

    Review Ultravox (formerly Fixie.ai)Review Dify