Ultravox is freemium — a usable free tier with paid plans above it. Vapi is freemium — a usable free tier with paid plans above it. Both are listed under Real-Time Voice Agents, so this is a like-for-like comparison. Neither is ranked above the other — Flocci carries no sponsored placement.
Ultravox is freemium — a usable free tier with paid plans above it and is listed for speech-native processing skips the STT-to-text bottleneck, preserving tone/cadence/pitch. Vapi is freemium — a usable free tier with paid plans above it and is listed for orchestrates STT/LLM/TTS providers of choice into one low-latency voice-agent pipeline. Both sit in Real-Time Voice Agents.
Neither — Ultravox and Vapi are both freemium, so the choice comes down to capability rather than cost. Both entries list what they uniquely do above.
Choose Ultravox if you need speech-native processing skips the STT-to-text bottleneck, preserving tone/cadence/pitch; choose Vapi if you need orchestrates STT/LLM/TTS providers of choice into one low-latency voice-agent pipeline. Flocci AI Tools does not rank one above the other — it shows both feature sets side by side and lets the requirement decide.
| Ultravox | Vapi | |
|---|---|---|
| Pricing tier | Free tier + paid plans | Free tier + paid plans |
| Free to start | Yes | Yes |
| Category | AI Agents & Automation | AI Agents & Automation |
| Type | Real-Time Voice Agents | Real-Time Voice Agents |
| Listed capabilities |
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| Tags | ultravox, speech native voice ai, real time voice model, low latency voice agent, open weight voice model, free | vapi, voice ai agent platform, real time voice agent, ai phone agent builder, voice agent api, free trial |
| Website | ultravox.ai | vapi.ai |
| Full page | Ultravox details → | Vapi details → |
| Alternatives | Ultravox alternatives → | Vapi alternatives → |