Fifth Door

San Francisco, CA · Founded 2025 · Privately Held (backing)

Developer of browser-based interactive experiences designed for the rapid deployment of digital game formats. Fifth Door is based in San Francisco, CA and was founded in 2025. Its last reported valuation was $104 million in Nov 2025. It has raised $20.5 million.

Last reported valuation
$104.0M
Oct 2026
Priced at
—
Total raised
$20.5M
Last round
—

Who backs Fifth Door?

8 investors
InvestorType
Y CombinatorOther
Rebel FundVenture capital
FelicisVenture capital
Offline VenturesVenture capital
Garry TanHigh net worth
Daft Capital—
StoryHouse Ventures—
George Bousis—
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Fifth Door investors

8 investors are on record for Fifth Door, including Y Combinator, Rebel Fund, Felicis and Offline Ventures.

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