How many companies use HTTP/3 vs Klaviyo?

199,043 companies use HTTP/3 and 52,099 companies use Klaviyo in our database. HTTP/3 is more widely adopted with 3.8x more companies than Klaviyo.

Can I get a list of companies using both HTTP/3 and Klaviyo?

Yes. AgentData tracks companies using both tools. Sign up free to access the full list with emails, tech stacks, and contacts via CSV or API.

HTTP/3 is used by 199,043companies — 3.8x more than Klaviyo (52,099).

199,043 use HTTP/352,099 use Klaviyo

	HTTP/3	Klaviyo
Companies	199,043	52,099
Category	Miscellaneous	Other

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251,142 companies with emails, tech stacks, and contacts

1,000 lookups · API access · CSV exports

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GET /api/v1/tech?name=http-3

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