Open source focus

Open Source Alternatives to Phone.do

24 open source App options similar to Phone.do, 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
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
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
Appwrite58
EnterpriseSan Francisco, United States$37.0M
Open-source backend-as-a-service platform for building scalable applications.
Open source · Self-hostable
MetalBear56
Software DevelopmentSan Francisco, United States$12.5M
Open-core company building tools for modern backend engineers to ship faster and better.
Open source · Self-hostable
WireMock53
Enterprise$6.5M
Industry-standard API simulation and mocking platform for reliable software development and testing.
Open source · Self-hostable
Novu48
EnterpriseTel Aviv, Israel$6.6M
Open-source notification infrastructure for developers, empowering the community.
Open source · Self-hostable
Slauth.io43
EnterpriseAshburn, United States$1.5M
Ark Infotech offers Cybersecurity, AI/ML, Data Analytics, and IT consulting services, including the Slauth.io IAM Policy Copilot.
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
Responsive35
EnterpriseSan Francisco, United States
Platform for developers building stateful reactive applications on the modern cloud with object store native databases.
Open source · Self-hostable
Amplication33
EnterpriseTel Aviv, Israel
Open-source Node.js backend development platform for accelerating application development.
Open source · Self-hostable
pyannote SAS23
Speech RecognitionParis, France
Company
Open source
Talkcan7
Open Source
An open-source programmable walkie-talkie for routing voice through configurable channels.
Open source
ScyllaDB67
DatabasePalo Alto, United States$101.0M
ScyllaDB is a high-performance, low-latency NoSQL database for data-intensive applications, designed to scale with modern infrastructure.
Open source · Self-hostable
Logz.io63
EnterpriseTel Aviv, Israel$122.0M
Logz.io provides an observability platform for cloud-native businesses, combining open-source tools for monitoring and security.
Open source · Self-hostable
Codefresh62
EnterpriseBrisbane, Australia$42.0M
Octopus Deploy provides a unified platform for continuous delivery, automating deployments, runbooks, and operations for modern applications.
Open source · Self-hostable
DragonflyDB61
DatabaseTel Aviv, Israel$21.0M
Source-available, multi-threaded Redis replacement for modern cloud workloads.
Open source · Self-hostable
Odigos56
Enterprise$13.0M
Open-source project for instant distributed tracing and metrics using eBPF and OpenTelemetry.
Open source · Self-hostable
Backslash Security56
CybersecurityTel Aviv, Israel$27.0M
Agentic endpoint security for AI coding, providing visibility, governance, and real-time protection.
Open source
ARMO56
EnterpriseTel Aviv, Israel$34.5M
ARMO provides an open-source Kubernetes security platform, Kubescape, for end-to-end security from development to production.
Open source · Self-hostable
CloudQuery53
EnterpriseSan Francisco, United States$18.5M
Open-source data integration platform for security and infrastructure teams.
Open source · Self-hostable
OpenOps53
EnterpriseSan Francisco, United States$125K
No-code, open-source cloud automation platform for FinOps and custom solutions.
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
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
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
AppwriteOpen-source backend-as-a-service platform for building scalable applications.	Enterprise	Open source · Self-hostable	San Francisco, United States	$37.0M	58
MetalBearOpen-core company building tools for modern backend engineers to ship faster and better.	Software Development	Open source · Self-hostable	San Francisco, United States	$12.5M	56
WireMockIndustry-standard API simulation and mocking platform for reliable software development and testing.	Enterprise	Open source · Self-hostable	—	$6.5M	53
NovuOpen-source notification infrastructure for developers, empowering the community.	Enterprise	Open source · Self-hostable	Tel Aviv, Israel	$6.6M	48
Slauth.ioArk Infotech offers Cybersecurity, AI/ML, Data Analytics, and IT consulting services, including the Slauth.io IAM Policy Copilot.	Enterprise	Open source · Self-hostable	Ashburn, United States	$1.5M	43
MycroftOpen-source, privacy-focused voice assistant and AI platform.	Voice AI	Open source · Self-hostable	Kansas City, United States	$121.5M	35
ResponsivePlatform for developers building stateful reactive applications on the modern cloud with object store native databases.	Enterprise	Open source · Self-hostable	San Francisco, United States	—	35
AmplicationOpen-source Node.js backend development platform for accelerating application development.	Enterprise	Open source · Self-hostable	Tel Aviv, Israel	—	33
pyannote SASCompany	Speech Recognition	Open source	Paris, France	—	23
TalkcanAn open-source programmable walkie-talkie for routing voice through configurable channels.	Open Source	Open source	—	—	7
ScyllaDBScyllaDB is a high-performance, low-latency NoSQL database for data-intensive applications, designed to scale with modern infrastructure.	Database	Open source · Self-hostable	Palo Alto, United States	$101.0M	67
Logz.ioLogz.io provides an observability platform for cloud-native businesses, combining open-source tools for monitoring and security.	Enterprise	Open source · Self-hostable	Tel Aviv, Israel	$122.0M	63
CodefreshOctopus Deploy provides a unified platform for continuous delivery, automating deployments, runbooks, and operations for modern applications.	Enterprise	Open source · Self-hostable	Brisbane, Australia	$42.0M	62
DragonflyDBSource-available, multi-threaded Redis replacement for modern cloud workloads.	Database	Open source · Self-hostable	Tel Aviv, Israel	$21.0M	61
OdigosOpen-source project for instant distributed tracing and metrics using eBPF and OpenTelemetry.	Enterprise	Open source · Self-hostable	—	$13.0M	56
Backslash SecurityAgentic endpoint security for AI coding, providing visibility, governance, and real-time protection.	Cybersecurity	Open source	Tel Aviv, Israel	$27.0M	56
ARMOARMO provides an open-source Kubernetes security platform, Kubescape, for end-to-end security from development to production.	Enterprise	Open source · Self-hostable	Tel Aviv, Israel	$34.5M	56
CloudQueryOpen-source data integration platform for security and infrastructure teams.	Enterprise	Open source · Self-hostable	San Francisco, United States	$18.5M	53
OpenOpsNo-code, open-source cloud automation platform for FinOps and custom solutions.	Enterprise	Open source · Self-hostable	San Francisco, United States	$125K	53