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Disclaimer: Star Stack provides information about European technology services for educational purposes only. Service listings, sovereignty assessments, and recommendations do not constitute legal, financial, or professional advice. We encourage you to verify all information independently and consult appropriate professionals before making technology decisions. Star Stack is not affiliated with any listed services unless explicitly stated.

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H2O | Star Stack

Services
H2O

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H2O

Name: H2O
Author: Star Stack

Optimized HTTP/1, HTTP/2, and HTTP/3 server written in C

Visit Website GitHub 11.5K

About

H2O is an optimized HTTP server supporting HTTP/1.x, HTTP/2, and HTTP/3 protocols. Written in C and licensed under the MIT License, it can also be used as a library.

Resources

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Sovereignty Score

Recorded assessment version: jurisdiction-ownership-2026-10-04

out of 100

Data completeness50% (Partial)

Jurisdictional(56%)

Strong EU base with minimal foreign legal exposure

Jurisdiction: Japan (EU adequacy decision)
No foreign parent provider

Ownership(44%)

Significant foreign ownership or control risk

Public company (other exchange)
Publicly traded
Acquisition risk unknown (assumed high) (Submit verified data to improve this score)

More dimensions coming soon

GovernanceComing soon

PortabilityComing soon

LicenseComing soon

CommunityComing soon

How missing data affects scores Submit data corrections

Provider

DeNA Co., Ltd.

Quick Facts

Legal jurisdiction: Japan
Headquarters: Japan
Ownership: Public (Other)
Deployment: Self-host, SaaS

Evidence and freshness

Verification date unknown. This assessment needs review.

A score is an assessment of recorded facts. Missing evidence and unresolved ownership can affect the result.

hqCountry: github
Retrieved 30/01/2026, confidence 90%.
Read evidence excerpt
H2O is copyrighted by DeNA Co., Ltd. (Japanese company), Kazuho Oku, and contributors including Fastly, Inc.
hqCountry: github
Retrieved 30/01/2026, confidence 90%.
Read evidence excerpt
H2O is copyrighted by DeNA Co., Ltd. (Japanese company), Kazuho Oku, and contributors including Fastly, Inc.