ABOUT HYUNJUNG S&C

From idea to app and web,
concept through release

Founded in March 2025, HYUNJUNG S&C designs and builds mobile apps and web services under the EURION brand. We turn problems we run into ourselves into working services: the notification archive Pushbin, the to-do and routine app PushBin (formerly SalimButton), two mobile games, the ZEKILO web tools, and a web operations system we use in-house. Cyber Pinball (formerly Chip Match), Hacker Cat, Pushbin, and PushBin - To-dos, Routines & Repeat Reminders are live on Google Play, and ZEKILO brings calculators, Studio file tools, and Dev developer tools together on one domain, zekilo.com. Next, we are developing AI products designed to run on Anthropic's Claude API: an AI-powered knowledge assistant, a workflow and analytics agent, and learning-content tools (see the AI roadmap).

LEGAL ENTITY: HYUNJUNG S&C (현정에스앤씨)
FOUNDED: March 2025
HEADQUARTERS: South Korea
CONTACT: manager@eurion.co.kr

Product design

We watch for the small frictions in everyday use and build only the features that answer them. Pushbin started from one observation: notifications pile up and are never seen again.

App and web development

Apps and games are built with Flutter, and web services as static Astro sites. Our web tools finish calculations and file processing inside the browser, so user data does not stay on a server.

Release and operations

We handle the whole lifecycle ourselves — store listings and web deployments, launch, stabilisation, and ongoing improvement — and we run our own internal margin-calculation system the same way.

How we got here

March 2025 — Company founded HYUNJUNG S&C founded; design of our in-house sales margin system (sell) begins
January 2026 — In-house margin system goes live Our private web system for net margin per order and product across sales channels goes live at sell.eurion.co.kr
2026 — Pushbin designed and built Initial product design and Flutter development of the Pushbin notification archive
2026 — Pushbin spending tracker Added parsing of payment alerts into a spending log
2026 — Two mobile games designed and built Design began in 2026: an idle action RPG and a physics merge puzzle, built with Flutter and Flame
August 2026 — Pushbin released Pushbin launched on the Google Play Store — view on the store
September 2026 — Two games released Chip Match (now Cyber Pinball) and Hacker Cat launched on the Google Play Store — Cyber Pinball · Hacker Cat
2026 — SalimButton released and relaunched SalimButton launched on Google Play, then relaunched with routines, repeat reminders, and a daily briefing as PushBin - To-dos, Routines & Repeat Reminders — view on the store
September 2026 — ZEKILO launch Opened ZEKILO, calculators and converters for users in Korea and Japan — zekilo.com
September 2026 — AI product planning begins Started planning a Claude-based knowledge assistant and a workflow and analytics agent
October 2026 — ZEKILO Studio and Dev launch, merged into zekilo.com Opened ZEKILO Studio (upload-free file tools) and ZEKILO Dev (developer tools), then merged them with the calculators under one domain — zekilo.com
In progress — AI product development Building the knowledge assistant and the workflow and analytics agent; Claude API integration is the next step

Detailed progress for each product is on the product status page.

Let's talk

Product questions, partnership proposals, or anything else — email us any time.