Mark Kropf's Lab
The Lab That Ships
Privacy-first tools built by someone who uses them daily. No data brokering. No dark patterns. Just clean software that ships.
Products
What We're Building
Every product starts as a spark of conviction and ships as a real thing people can use.
Yuisei
Personal CRM
A private relationship system for people with good intentions. Import your contacts, set intentions, track relationship health, and show up prepared.
Supaku Account
Identity Layer
One secure identity across the Supaku ecosystem. No password fatigue, no data leakage between apps.
Kith
Open Source
A read-only macOS bridge from Apple Contacts and iMessage to terminal users, OpenClaw workflows, and agentic fleets that need local relationship context.
Why Supaku?
Build What You Want to Exist
Supaku products come from a simple question: “Why doesn’t this exist yet?” Conviction first, market second.
Privacy Is Architecture, Not Policy
Built so they can’t misuse your data, not so they promise not to. “Can’t” is more credible than “won’t.”
Ship, Then Iterate
A shipped experiment teaches more than a polished prototype. Launch lean, evolve based on real usage. Perfection is the enemy of the spark.
Built for people who demand better.
For tech professionals who want thoughtfully built tools that respect their data and their intelligence. No venture-backed growth hacking. Just clean tools built by someone who uses them daily.