Open Source Alternatives to B4t
6 open source AI Voice Agent options similar to B4t, ranked by named competitors first, sector overlap, and our 0-100 AI-readiness score. Every company listed publishes its source: each one carries an open source sector tag and a public GitHub repository.
Rasa49Conversational AIBerlin, Germany$13.0MOpen-source conversational AI platform for building custom chatbots and virtual assistants.
Open source · Self-hostable
Vocode50Open SourceSan Francisco, United States$3.8MOpen-source library for building hyper-realistic voice agents and conversational AI applications.
Open source · Self-hostable
Kyutai68Frontier AI LabParis, France$300.0MA non-profit AI research lab focused on open science and developing advanced multimodal and voice AI models.
Open source · Self-hostable
Coqui48Voice AIBerlin, Germany$2.0MOpen-source AI models for voice synthesis, translation, and TTS.
Open source · Self-hostable
Mycroft35Voice AIKansas City, United States$121.5MOpen-source, privacy-focused voice assistant and AI platform.
Open source · Self-hostable
- Firmgate7Enterprise Software
Australian-owned, sovereign-built, open-source self-hosted intranet with AI-enabled enterprise modules.
Open source
| Company | Sector | License | HQ | Funding | Score | Website |
|---|---|---|---|---|---|---|
| RasaOpen-source conversational AI platform for building custom chatbots and virtual assistants. | Conversational AI | Open source · Self-hostable | Berlin, Germany | $13.0M | 49 | |
| VocodeOpen-source library for building hyper-realistic voice agents and conversational AI applications. | Open Source | Open source · Self-hostable | San Francisco, United States | $3.8M | 50 | |
| KyutaiA non-profit AI research lab focused on open science and developing advanced multimodal and voice AI models. | Frontier AI Lab | Open source · Self-hostable | Paris, France | $300.0M | 68 | |
| CoquiOpen-source AI models for voice synthesis, translation, and TTS. | Voice AI | Open source · Self-hostable | Berlin, Germany | $2.0M | 48 | |
| MycroftOpen-source, privacy-focused voice assistant and AI platform. | Voice AI | Open source · Self-hostable | Kansas City, United States | $121.5M | 35 | |
| Enterprise Software | Open source | — | — | 7 |