United States · 
Who invested in Keystone?
Keystone's investors include Y Combinator and Pioneer Fund.
United States · Pre-seed startup
Who invested in Keystone
Funding summaryUpdated 26 Oct 2026
$500Kraised across 1 round since 2025, from 1 source
- Latest round
- Pre-seed, $500KSept 2025
- Investors
- 2
The rounds
- Sept 2025
Everyone who backed them
Missing a round, or an investor who was in one? Tell us.
Also claim to have backed them
These 2 firms list Keystone as a portfolio company on their own websites, but no report of a round names them. They are the firms' own claims, kept apart from the rounds above.
Quick answers about Keystone
How much has Keystone raised?
Keystone has raised $500K across 1 round since 2025.
When did Keystone last raise?
Keystone's most recent round was a Pre-seed of $500K in Sept 2025.
What was Keystone's biggest round?
Its most recent round, $500K in Sept 2025, is also its largest on record.
Who backed Keystone first?
Keystone's first round on record, in Sept 2025, was backed by Y Combinator and Pioneer Fund.
What stage is Keystone at?
Keystone's latest named round is a Pre-seed, in Sept 2025.
Where is Keystone based?
Keystone is based in the United States.
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