How many companies use HTTP/3 vs Substack?

199,043 companies use HTTP/3 and 359 companies use Substack in our database. HTTP/3 is more widely adopted with 554.4x more companies than Substack.

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

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 — 554.4x more than Substack (359).

199,043 use HTTP/3359 use Substack

	HTTP/3	Substack
Companies	199,043	359
Category	Miscellaneous	Blogs

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199,402 companies with emails, tech stacks, and contacts

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

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