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Bolna

Open-source framework for phone voice agents, from an India-based team

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What Bolna does

  • 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

Bolna — straight answers

What is Bolna?

Bolna is listed under Real-Time Voice Agents, in the AI Agents & Automation category on Flocci AI Tools. Open-source framework for phone voice agents, from an India-based team. It is free, with no paid plan attached, and it lives at bolna.ai.

Is Bolna free?

Bolna is listed as fully free — there is no paid tier attached to it in the catalog. That makes it one of the 399 entries on Flocci AI Tools with no upgrade path built in.

What can Bolna do?

Bolna does 4 things the catalog singles out: 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.

What is the best free alternative to Bolna?

Kyutai Unmute is the closest free alternative: it sits in the same Real-Time Voice Agents sub-category and is free. LiveKit Agents, Pipecat and TEN Framework also start free. The full list is on the alternatives page.

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Bolna alternatives

Compare all alternatives →

Vapi

Real-Time Voice Agents
freemiumLeaving soon
  • 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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Retell AI

Real-Time Voice Agents
freemiumLeaving soon
  • 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
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Bland AI

Real-Time Voice Agents
freemiumLeaving soon
  • 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
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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
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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
freemiumLeaving soon
  • 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
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Head-to-head comparisons

Bolna vs VapiBolna vs Retell AIBolna vs Bland AIBolna vs LiveKit AgentsBolna vs PipecatBolna vs Ultravox