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Reviewed · Updated 2026-06-20

fixie.ai

AI-based task automation platform for integrating APIs and triggers in workflows.

Reviewed by the Conversion Gems editorial team ·
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Pricing
Freemium
Best for
Developers
Category
AI Agent Builders
The bottom line

Developer-first voice AI infrastructure for real-time conversational agents — now operating as Ultravox.ai.

7.2
Our score
7.2 / 10
Conversion Gems editorial verdict
Free (30 min); Pro $100/mo
Features8/10
8 - speech-native model, telephony, RAG corpora, outbound scheduler, web/mobile SDKs; strong depth for voice-agent use cases.
Value7/10
7 - generous free tier; $100/mo Pro is a steep jump with no intermediate tier; SIP costs add on top.
Ease of use7/10
7 - clean API and playground lower the barrier; still requires developer skill, no no-code path.
Ecosystem7/10
7 - telephony integrations, OSS model, HuggingFace presence; ecosystem is growing but narrower than general-purpose AI platforms.
Support6/10
6 - Enterprise SLA documented; limited public support details for free/Pro tiers.
What it really is

Ultravox (fka Fixie.ai) — speech-native voice AI API for building real-time conversational voice agents.

Our take

DB describes this as a task-automation/workflow tool at $29/mo — both are wrong. Fixie.ai has fully rebranded to Ultravox.ai (fixie.ai now redirects there) and pivoted to speech-native voice AI infrastructure. The product is a developer API for building low-latency real-time voice agents that process audio directly without a text-transcription step. Pricing has also changed: entry is free (30 min/mo), usage is $0.05/min after, and the only paid tier is Pro at $100/mo.

Why we rate it

Ultravox's speech-native architecture sidesteps the ASR bottleneck that plagues pipeline-based voice stacks. The open-source model on HuggingFace (fixie-ai/ultravox) lets developers benchmark quality before committing API spend. The free playground and usage-based entry tier are genuinely developer-friendly for prototyping.

The catch

There is no mid-tier — it jumps from free usage to $100/mo Pro with no stepping stone. SIP/telephony costs ($0.48/min) add up quickly for production call-center workloads, and it requires coding skill; no-code teams are out.

Best for
Developers building real-time voice agent products
Startups prototyping conversational AI with telephony
Teams needing low-latency speech-native API infrastructure
Not good for
Non-technical teams expecting no-code workflow automation
High-volume telephony deployments sensitive to per-minute costs
General task-automation or API-integration use cases
Friction report
Time to value
Fast: free tier with playground access available immediately; developers can integrate the API within hours using provided SDKs.
Scale breakpoint
SIP telephony at $0.48/min scales poorly for large call-center volumes; Enterprise pricing required but not publicly disclosed.
Walled garden
Low: core model is open-source on HuggingFace; standard REST API design means switching is feasible.

Frequently Asked Questions

Alternatives

Step up

ElevenLabs Conversational AI for broader voice customization and enterprise-grade support.

Lighter alternative

Vapi or Bland.ai for simpler voice agent deployment with lower per-minute entry costs.

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Tags

#DeveloperTools#LLMTools#AIInfrastructure

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