H2O is a fast and secure HTTP/2 server written in C by Kazuho Oku.
Get all 6 companies using H2O
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Companies
6
Top Country
US
Top Industry
Apps
Adoption Insights
H2O is used by 6 companies in our database, representing approximately 0.00% of all tracked websites. The most common industry using H2O is Apps, and adoption is strongest in US.
Top Countries Using H2O
Top Industries Using H2O
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How We Detect H2O
The Web Radar detects H2O by analyzing HTTP headers, JavaScript variables, HTML source code, cookies, and DNS records across 3M+ websites. Our detection engine uses over 10,000+ pattern rules to ensure accurate identification. Browse all technologies →
Frequently Asked Questions
What is H2O?+
H2O is a fast and secure HTTP/2 server written in C by Kazuho Oku.
How many companies use H2O?+
6 companies in our database use H2O, representing approximately 0.00% of all tracked websites.
What industries use H2O the most?+
The top industries using H2O are Apps, Artificial Intelligence (AI), CleanTech.
What countries use H2O the most?+
The top countries using H2O are US, JP, CZ.
Is H2O popular?+
H2O is used by 6 companies, making it a notable Web servers technology based on adoption across our tracked websites.
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Browse DatasetsData last updated: June 2026