Tsumiki Lab
Three stacked building blocks: a large teal cube, a sand cube, and a small coral cube

Small, simple apps — like building blocks.

Tsumiki Lab makes focused apps that each do one thing well. Simple pieces you can rely on, built with care for the Mac.

Apps

What we're building.

Mendy app icon: a periodic-table tile reading Md 101

Mendy Coming soon

A simple Markdown editor for macOS

Write in plain .md files that live in your own folders, with a live preview, a / menu for Markdown syntax, and easy image insertion.

Learn more about Mendy →

About

Tsumiki (積み木) means building blocks in Japanese.

Simple

Each app does one thing, and does it clearly. No clutter, no learning curve.

Focused

Small pieces that fit together, like blocks — instead of one app that tries to do everything.

Yours

Your work stays in plain, open files on your own Mac, readable by any other app.