Open source focus

Open Source Alternatives to Aircall

19 open source Voice AI options similar to Aircall, 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.

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Rasa49
Conversational AIBerlin, Germany$13.0M
Open-source conversational AI platform for building custom chatbots and virtual assistants.
Open source · Self-hostable
Vocode50
Open SourceSan Francisco, United States$3.8M
Open-source library for building hyper-realistic voice agents and conversational AI applications.
Open source · Self-hostable
Kyutai68
Frontier AI LabParis, France$300.0M
A non-profit AI research lab focused on open science and developing advanced multimodal and voice AI models.
Open source · Self-hostable
Coqui48
Voice AIBerlin, Germany$2.0M
Open-source AI models for voice synthesis, translation, and TTS.
Open source · Self-hostable
cal.com41
Scheduling SoftwareBerlin, Germany
Open-source scheduling infrastructure for individuals, businesses, and developers.
Open source · Self-hostable
Mycroft35
Voice AIKansas City, United States$121.5M
Open-source, privacy-focused voice assistant and AI platform.
Open source · Self-hostable
Hugging Face76
AINew York, United States$395.2M
Hugging Face is the leading AI community and platform for machine learning collaboration, enabling developers to build, share, and deploy models, datasets, and applications.
Open source · Self-hostable
Grafana Cloud69
ObservabilityNew York, United States$2.1B
Full-stack observability platform built on open standards for unifying telemetry and accelerating troubleshooting.
Open source · Self-hostable
Firebolt65
Cloud Data WarehousePalo Alto, United States$264.0M
Cloud data warehouse for building next-gen analytics experiences with sub-second performance, designed for engineers and AI agents.
Open source
Liblab55
Developer ToolsAustin, United States$42.0M
SDK-as-a-service platform for API providers, offering code generation and SDK management to enhance developer experience.
Open source · Self-hostable
United Manufacturing Hub Systems48
ManufacturingCologne, Germany$5.4M
An open-source data platform for manufacturers to access and structure machine data.
Open source · Self-hostable
Tidelift50
SaaSBoston, United States$15.0M
Platform providing managed open source software with security, maintenance, and licensing assurances for enterprises.
Open source · Self-hostable
FerretDB49
DatabasesWilmington, United States$6.8M
An open-source, MongoDB-compatible document database built on PostgreSQL.
Open source · Self-hostable
Mycroft AI38
Voice AssistantKansas City, United States$4.0M
Open-source, privacy-focused voice assistant and AI platform.
Open source · Self-hostable
Parlant26
AI AgentsTel Aviv, Israel
Parlant is an open-source conversational AI engine dedicated to solving the Human/AI alignment problem by enabling Large Language Models to reliably perform as desired and prevent hallucinations.
Open source · Self-hostable
pyannote SAS23
Speech RecognitionParis, France
Company
Open source
Pomvox21
Voice AI
Press a key, talk, and clean text appears at your cursor, transcribed on the Apple Neural Engine. Free, open source, and fully private.
Open source
WP Job Manager16
WordPress PluginDublin, Ireland
A free WordPress job board plugin
Open source
LibreChat10
AINew York, United States
Open-source, self-hostable AI chatbot UI.
Open source · Self-hostable

Company	Sector	License	HQ	Funding	Score
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
cal.comOpen-source scheduling infrastructure for individuals, businesses, and developers.	Scheduling Software	Open source · Self-hostable	Berlin, Germany	—	41
MycroftOpen-source, privacy-focused voice assistant and AI platform.	Voice AI	Open source · Self-hostable	Kansas City, United States	$121.5M	35
Hugging FaceHugging Face is the leading AI community and platform for machine learning collaboration, enabling developers to build, share, and deploy models, datasets, and applications.	AI	Open source · Self-hostable	New York, United States	$395.2M	76
Grafana CloudFull-stack observability platform built on open standards for unifying telemetry and accelerating troubleshooting.	Observability	Open source · Self-hostable	New York, United States	$2.1B	69
FireboltCloud data warehouse for building next-gen analytics experiences with sub-second performance, designed for engineers and AI agents.	Cloud Data Warehouse	Open source	Palo Alto, United States	$264.0M	65
LiblabSDK-as-a-service platform for API providers, offering code generation and SDK management to enhance developer experience.	Developer Tools	Open source · Self-hostable	Austin, United States	$42.0M	55
United Manufacturing Hub SystemsAn open-source data platform for manufacturers to access and structure machine data.	Manufacturing	Open source · Self-hostable	Cologne, Germany	$5.4M	48
TideliftPlatform providing managed open source software with security, maintenance, and licensing assurances for enterprises.	SaaS	Open source · Self-hostable	Boston, United States	$15.0M	50
FerretDBAn open-source, MongoDB-compatible document database built on PostgreSQL.	Databases	Open source · Self-hostable	Wilmington, United States	$6.8M	49
Mycroft AIOpen-source, privacy-focused voice assistant and AI platform.	Voice Assistant	Open source · Self-hostable	Kansas City, United States	$4.0M	38
ParlantParlant is an open-source conversational AI engine dedicated to solving the Human/AI alignment problem by enabling Large Language Models to reliably perform as desired and prevent hallucinations.	AI Agents	Open source · Self-hostable	Tel Aviv, Israel	—	26
pyannote SASCompany	Speech Recognition	Open source	Paris, France	—	23
PomvoxPress a key, talk, and clean text appears at your cursor, transcribed on the Apple Neural Engine. Free, open source, and fully private.	Voice AI	Open source	—	—	21
WP Job ManagerA free WordPress job board plugin	WordPress Plugin	Open source	Dublin, Ireland	—	16
LibreChatOpen-source, self-hostable AI chatbot UI.	AI	Open source · Self-hostable	New York, United States	—	10