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Vellum develops tools for building, testing, and monitoring applications based on large language models.
Founded in 2023 and based in New York, US, Vellum provides software for developing applications with large language models. Its tools support prompt engineering, testing and evaluation, version history, collaboration, monitoring, and search. Clients include PYQ, Left Field Labs, Uberduck, Vimcal, Feeling Good App, and Encore. In July 2025, Vellum raised USD 20 million in Series A funding led by Leaders Fund, with Socii Capital, Y Combinator, Rebel Fund, Pioneer Fund, and Eastlink Capital participating.
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