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About
Oscar Karlstromer is the founder of Zaplar. He previously attended the Stockholm School of Economics (making the Honors List before dropping out), founded a Nordic non-profit for middle school academic competitions that reached 40,000 students with a 13-person team, and worked in APAC B2B sales handling accounts over $1M AUD across Sydney and Singapore.
Founder at ZaplarYC S26
Intro paths
Oscar went through Y Combinator (Summer 2026) — any YC alum in your network can reach them through the YC community.
Their group partner at YC was Jared Friedman, YC Group Partner — the partner who ran Zaplar's batch and knows the company first-hand. YC profile ↗
In turn, Oscar can intro founders to Zaplar's investors below.
Zaplar's investors · 5
Co-founders at Zaplar
Frequently asked questions
- Who is Oscar Karlstromer?
- Oscar Karlstromer is the founder of Zaplar. He previously attended the Stockholm School of Economics (making the Honors List before dropping out), founded a Nordic non-profit for middle school academic competitions that reached 40,000 students with a 13-person team, and worked in APAC B2B sales handling accounts over $1M AUD across Sydney and Singapore.
- Where does Oscar Karlstromer work?
- Oscar Karlstromer is Founder of Zaplar.
- What companies did Oscar Karlstromer found?
- Oscar Karlstromer founded Zaplar.
Founder mafias
Y Combinator mafia10,594
Also came through, then founded or led a company.
The Wharton School mafia827
Also came through, then founded or led a company.
Stockholm School of Economics mafia85
Also came through, then founded or led a company.
About this profile. Compiled from public sources — Zaplar's own website and public professional profiles — and summarised by Fundraising Fox; every fact is kept with where it came from. Spotted an error, or would rather not be listed? Email privacy@fundraisingfox.com · How we build profiles · Your rights