Real-Time Voice Agentsfree

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 397 entries on Flocci AI Tools with no upgrade path built in.

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

Bolna works in a normal browser tab with no install. It is available on the web and an API. India focus; Indian-language voice agents

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.

See the full list →

Bolna 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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Retell AI

Real-Time Voice Agents
freemium
  • 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
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
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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
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
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Head-to-head comparisons

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