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Stainless automates the generation and maintenance of idiomatic, multi-language SDKs from API specifications, serving API-first companies that need production-ready client libraries without dedicating engineering headcount to SDK upkeep.
Raised $25M across disclosed rounds.[3][4][6]
Series A closed December 2024, led by Andreessen Horowitz.[3][4][1]
post-money valuation is not publicly disclosed.
Named investors include Andreessen Horowitz, Sequoia Capital, The General Partnership, Felicis, Zapier, MongoDB Ventures, Claire Hughes Johnson (angel), Amit Agarwal (angel).[3][4][6]
Alex Rattray, Founder & CEO[3][4][5]
David Ackerman, Founding Engineer[3]
May 2026 · stainless.com
company
May 2026 · siliconangle.com
reported
May 2026 · techcrunch.com
reported
Stainless automates the generation and maintenance of idiomatic, multi-language SDKs from API specifications, serving API-first companies that need production-ready client libraries without dedicating engineering headcount to SDK upkeep.
Ask for one referenceable production customer.
Not a recommendation. The first thing this ledger cannot answer.
No comparable company is named by any source in this ledger.
The section stays empty until one is.
The customer proof is company-sourced only. No independent source in this ledger confirms it.[10]
Ask for one referenceable production customer.
Not a recommendation. The first thing this ledger cannot answer.
Filled in the side panel for invited readers. This card carries sourced facts only.
May 2026 · dailycompanynews.com
reported
May 2026 · econotimes.com
reported
May 2026 · stainless.com
company
May 2026 · stainless.com
company
May 2026 · astro.build
reported
May 2026 · keywordsai.co
verified