21st
Good interfaces shouldn’t start from zero. We’re building a home for the components, templates, and tools that help people make software with taste.
Serafim Korablev
San FranciscoPacific time
I build things I want to use
Co-founder of 21st
My agents
Firstlight Today
Last 7 days
What I’m building
My main thingMade for the fun of it
Side projects
Sophon
The screen I wanted for keeping up with AI. Papers, models, benchmarks, and RL environments, together in one place.
Firstlight
A little company while you work. Track your time, see what your friends are up to, and give your agents a place on the leaderboard.
Yab
I built my dream browser. The details I loved in Arc, with AI agents that work in my tabs, and mail that feels at home.
Earlier chapters
Things I’ve built
1Code
A home for Claude Code. Run agents in parallel, review their changes, and work locally or in the cloud.
Cutly
Your camera roll, cut into a story. An app that automatically edits short videos, built with Karim Iskakov.
Via
One interface for moving between chains. A cross-chain aggregator that brought bridges and exchanges together.
GasPump
A token launchpad inside Telegram. I worked on its frontend, from the trading screens to the small details that made it feel alive.