Software studio based in South Korea
We build apps
that people actually use.
ZERO CODE is a software studio in Busan, South Korea, founded in July 2025. We build and ship every product with Claude and Claude Code: Payment Calendar (iOS/Android, 2,000+ users) and Mathmello (math exam-paper editor for Korean teachers).
What we do
Apps we build ourselves
We turn ideas into working products and release them on the App Store, Google Play and the web. The goal is tools people use every day.
Custom online solutions for businesses
Online stores, booking and member management, workflow automation and in-house systems. We build what fits the business, from a small first step to a full system. See Solutions for details.
Our products
Payment Calendar
Subscription and fixed-expense tracker for iOS and Android
From Netflix and Spotify to all your memberships. See every recurring payment on one calendar and know what is due each month. Used by 2,000+ people.
Mathmello
Math exam-paper editor for teachers
Upload a PDF and problems come in with equations intact. Built for Korean math teachers who assemble tests from past exam papers. mathmello.com →
Nonogram Garden
Free, ad-supported puzzle game
A light nonogram puzzle game. Free to play, with no in-app purchases or subscriptions.
Contact
Project inquiries and partnership proposals are welcome.
Email: info@zerocode.world