Perfect Day, Inc. is a food technology startup company based in Berkeley, California, that has developed processes of creating whey protein by fermentation in microbiota, specifically from fungi in bioreactors, instead of extraction from bovine milk.

The board consists of cofounders Ryan Pandya, Perumal Gandhi, as well as Iger, Aftab Mathur of Temasek Holdings and Patrick Zhang of Horizons Ventures.

[13] In November 2018, the company announced a joint development agreement with Archer Daniels Midland to provide commercial-scale volumes of non-animal whey protein.

[12] As of 2020, Perfect Day is commercializing its products through the Urgent Company, which sells the Brave Robot brand of vegan dairy ice cream.

[22] In November 2021, Perfect Day announced its entrance into the sports nutrition market, offering vegan whey protein powders under the California Performance Co.

[23] In 2022, the company Tomorrow Farms launched Bored Cow, a brand of chocolate, vanilla, and strawberry milk made with Perfect Day's whey.