YC S23
Upstream
The first inbox designed for humans and agents
About
Upstream is an email client that handles your inbox for you. Agents sort the noise, draft in your exact voice, follow up on time, and do what you ask, so you can finally relax and enjoy email again.
Founders
Family Office Investors
Altss tracks family office allocations to YC-backed companies. Request access to see which family offices have invested in Upstream.
See family office activityIndustry & Focus
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