Real-Time Voice AgentsfreemiumLimited free

Retell AI

Free starting credit with no contract required

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Limited free tier

Only a one-time starter credit, then pay per minute. Need it free right now? Try Bolna →

What Retell AI does

  • Free starting credit with no contract required
  • Supports swapping GPT, Claude or Gemini as the reasoning layer per agent
  • Batch calling campaigns plus live AI-to-human call transfer built in

Retell AI — straight answers

What is Retell AI?

Retell AI is listed under Real-Time Voice Agents, in the AI Agents & Automation category on Flocci AI Tools. Free starting credit with no contract required. It is freemium — a usable free tier with paid plans above it, and it lives at retellai.com.

Is Retell AI free?

Partly. Only a one-time starter credit, then pay per minute. If you need it free right now, Bolna does the same job for free.

Can I use Retell AI in a browser, or is there an app?

Retell AI works in a normal browser tab with no install. It is available on the web and an API. You can sign in with a Google account.

What can Retell AI do?

Retell AI does 3 things the catalog singles out: Free starting credit with no contract required; supports swapping gpt, claude or gemini as the reasoning layer per agent; batch calling campaigns plus live ai-to-human call transfer built in.

What is the best free alternative to Retell AI?

Bolna is the best free alternative: it does the same job and you can start without paying. Kyutai Unmute, LiveKit Agents and Pipecat also start free. The full list is on the alternatives page.

See the full list →

Retell AI alternatives

Compare all alternatives →

Vapi

Real-Time Voice Agents
freemium
  • Orchestrates STT/LLM/TTS providers of choice into one low-latency voice-agent pipeline
  • Usage-based per-minute pricing with free trial minutes included
  • SOC 2/HIPAA/PCI compliance add-ons for regulated call-center deployments
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Bland AI

Real-Time Voice Agents
freemium
  • All-in-one per-minute pricing bundles LLM+STT+TTS with no separate token pass-through charges
  • Free start with call credits plus an inbound number included
  • Tiered platform fees (Build/Scale) unlock lower per-minute rates for high volume
Visit

LiveKit Agents

Real-Time Voice Agents
free
  • Apache-2.0 open-source framework, fully self-hostable on your own servers
  • Native WebRTC client support across web/mobile/telephony out of the box
  • Native Model Context Protocol (MCP) support for tool-using voice agents
Visit

Pipecat

Real-Time Voice Agents
free
  • BSD-2-Clause open-source Python framework for real-time voice/multimodal agents
  • Supports distributed multi-agent systems with handoffs over a shared bus
  • Maintained by Daily with an active plugin ecosystem for STT/LLM/TTS providers
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Ultravox

Real-Time Voice Agents
freemium
  • Speech-native processing skips the STT-to-text bottleneck, preserving tone/cadence/pitch
  • Free tier: 5¢/min including TTS for up to 5 concurrent calls
  • Open-weight models (fixie-ai) published on Hugging Face for research use
Visit

Bolna

Real-Time Voice Agents
freeNew
  • Open-source framework for phone voice agents, from an India-based team
  • Connects to telephony, STT, LLM and TTS providers of your choice
  • Supports Indian languages
  • Self-host free; hosted platform is pay-as-you-go
Visit

Head-to-head comparisons

Retell AI vs VapiRetell AI vs Bland AIRetell AI vs LiveKit AgentsRetell AI vs PipecatRetell AI vs UltravoxRetell AI vs Bolna