Open source focus

Open Source Alternatives to Neonmail

15 open source Privacy options similar to Neonmail, 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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Signal9
MessagingWashington, United States
End-to-end encrypted messaging and voice calling app focused on privacy and security.
Open source
Velum Labs49
Machine LearningSan Francisco, United States$500K
Firewall that controls access to information across AI and humans
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
Open Bitcoin Tracker23
Fintech
A privacy-focused, open-source Android app to track Bitcoin value without accounts or analytics.
Open source · Self-hostable
Off Grid9
Edge AI
Off Grid runs AI models directly on your phone, ensuring privacy and local processing.
Open source · Self-hostable
Whonix9
Operating System
A free, open-source, and hardened Linux distribution for advanced anonymity and security online.
Open source
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
Mozilla Firefox54
InternetSan Francisco, United States$2.3M
Open-source web browser focused on privacy, user control, and an open internet.
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
Puck52
Endpoint SecurityUnited States
Open-source, AI-driven endpoint investigation tool for security teams.
Open source · Self-hostable
Archestra.AI50
Artificial IntelligenceLondon, United Kingdom$10.0M
An open-source platform enabling enterprises to securely connect sensitive data to AI agents.
Open source · Self-hostable
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
Plainva9
Open Source
A local-first, open-source Markdown editor that syncs notes through your own cloud storage.
Open source
Kryptvakt8
Cybersecurity
Kryptvakt offers a secure, decentralized platform for managing and sharing sensitive data.
Open source
GrapheneOS
Operating SystemToronto, Canada
A privacy and security-focused mobile operating system based on Android.
Open source · Self-hostable

Company	Sector	License	HQ	Funding	Score
SignalEnd-to-end encrypted messaging and voice calling app focused on privacy and security.	Messaging	Open source	Washington, United States	—	9
Velum LabsFirewall that controls access to information across AI and humans	Machine Learning	Open source · Self-hostable	San Francisco, United States	$500K	49
Mycroft AIOpen-source, privacy-focused voice assistant and AI platform.	Voice Assistant	Open source · Self-hostable	Kansas City, United States	$4.0M	38
Open Bitcoin TrackerA privacy-focused, open-source Android app to track Bitcoin value without accounts or analytics.	Fintech	Open source · Self-hostable	—	—	23
Off GridOff Grid runs AI models directly on your phone, ensuring privacy and local processing.	Edge AI	Open source · Self-hostable	—	—	9
WhonixA free, open-source, and hardened Linux distribution for advanced anonymity and security online.	Operating System	Open source	—	—	9
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
Mozilla FirefoxOpen-source web browser focused on privacy, user control, and an open internet.	Internet	Open source · Self-hostable	San Francisco, United States	$2.3M	54
CloudQueryOpen-source data integration platform for security and infrastructure teams.	Enterprise	Open source · Self-hostable	San Francisco, United States	$18.5M	53
PuckOpen-source, AI-driven endpoint investigation tool for security teams.	Endpoint Security	Open source · Self-hostable	United States	—	52
Archestra.AIAn open-source platform enabling enterprises to securely connect sensitive data to AI agents.	Artificial Intelligence	Open source · Self-hostable	London, United Kingdom	$10.0M	50
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
PlainvaA local-first, open-source Markdown editor that syncs notes through your own cloud storage.	Open Source	Open source	—	—	9
KryptvaktKryptvakt offers a secure, decentralized platform for managing and sharing sensitive data.	Cybersecurity	Open source	—	—	8
GrapheneOSA privacy and security-focused mobile operating system based on Android.	Operating System	Open source · Self-hostable	Toronto, Canada	—	—