Bolna

Open-source voice AI platform for building and deploying automated phone-call agents

Data verified Oct 16, 2026

Pundit
Score

Editorial Verdict

AI-researched, not hands-on tested

An open-source framework with bring-your-own-key support and transparent, volume-discounted pricing gives Bolna real cost control, especially for Indian and regional languages. The one thing to budget separately: telephony charges bill on top of platform fees, and per-minute costs still add up at scale.

Reviewed by AIToolPundit Editorial Team · last verified October 2026

About Bolna

Bolna is an open-source platform for building, testing, and deploying AI voice agents that hold natural phone conversations, handling pauses and interruptions across inbound and outbound calls. The agents answer calls around the clock, book appointments, qualify leads, screen candidates, and provide customer support, with call transcripts and performance analytics. It orchestrates speech-to-text, LLM, and text-to-speech providers over telephony services like Twilio and Plivo, supports 40+ languages including Indian vernaculars, and can run at scale via hosted APIs or self-hosting.

Screenshots

Commonly Cited Strengths & Limitations

Strengths

Open-source (MIT) and self-hostable
Strong multilingual support for 10+ Indian languages
Low sub-300ms response latency
Fast agent setup (under five minutes)
Flexible mix-and-match of ASR/LLM/TTS providers

Limitations

Telephony charges are billed separately on top of platform fees
Per-minute costs can add up at scale

Common Use Cases

Lead qualification
Appointment booking
Customer support and triage
Interviews/screening
Call transfers
AI front desk / receptionist operations

Details

Pricing Model: Freemium
Starting Price: $0.06/min
Founded: 2024
Team Size: 21 employees
Headquarters: Bengaluru, India (incorporated in Dover, Delaware, USA)
Category: Customer Support

Who is Bolna for?

Developers

Use the open-source MIT-licensed framework and SDK to build and self-host custom voice AI applications.

Sales teams

Run outbound batch calling campaigns to qualify leads and automatically book follow-up appointments.

Customer support teams

Deploy 24/7 inbound voice agents to answer FAQs and triage incoming calls.

Frequently Asked Questions

Is Bolna free?

Bolna offers a free plan, with paid plans starting at $0.06/min.

Does Bolna offer a free trial?

Yes, Bolna offers a free trial.

Does Bolna have an API?

Yes, Bolna provides an API for developers.

Is Bolna open source?

Yes, Bolna is open source.

What does Bolna integrate with?

Bolna integrates with Twilio, Plivo, Exotel, Vonage, Deepgram, Azure, Sarvam, Smallest AI, and more.

Is Bolna cloud-based or self-hosted?

Bolna is offered as both cloud and self-hosted (hybrid) deployment.

What are the downsides of Bolna?

Telephony charges are billed separately on top of platform fees Also, Per-minute costs can add up at scale

Who is Bolna best for?

Bolna is best suited for Developers, Sales teams, Customer support teams.

What can I use Bolna for?

Common uses for Bolna include lead qualification, appointment booking, customer support and triage, interviews/screening.

How does Bolna compare to Layerpath?

Bolna and Layerpath are both used for customer support -- specifically customer support tools. See the full side-by-side comparison for pricing and feature differences.