STEFANCHO LABS

Company, brand and service

Company

STEFANCHO LABS (스테판초 랩스), the business that builds and runs everything on this page. Registered in Korea on April 8, 2026.

App brand

Starfathom, the name on our 15 iOS and Android apps and on this website. A brand of STEFANCHO LABS, not a separate company.

Live service

Byeolheim (별헤임) at byeolheim.com, a paid saju report service that opened on October 11, 2026. Operated by STEFANCHO LABS.

Mission

We make small products that each solve one everyday need well, for people in Korea first.

We build them with AI agents, so a very small team can run many products and change them quickly when real usage shows what works. Our goals for the next year:

• Grow Byeolheim into a paid service that pays for itself.
• Improve the apps people use most, guided by how they actually use them.
• Use what we learn to launch more paid products.

Byeolheim, our live service

Byeolheim별헤임

Byeolheim reads a person's saju, the traditional Korean reading of birth date and time, and turns it into a personal report with a narrator comic. Most readings start with a free preview, and the lifetime report has a 20-page sample. Paid reports cost 990 to 29,900 KRW and open on the web right after payment; the lifetime report runs to about 225 pages and can be downloaded as a PDF.

Each report is computed from the customer's birth chart. Parts of the text and the comic dialogue are written by AI models, and the service says so to customers.

byeolheim.com / Korean / opened October 11, 2026

Starfathom apps

• 

  Runfolio

  A logbook for races you have already run: bibs, finish times and PBs, kept offline on your phone.

  iOS

• 

  OneCut

  A selfie camera that coaches your angle so one shot is enough, then retouches lightly on the device.

  iOS

• 

  GoalNine

  A 9×9 Mandala chart planner for one core goal and the steps under it. Nine Cells on Android.

  iOS / Android

• 

  IceLog

  A one-tap log for cold showers, with a timer and a streak that grows like grass.

  iOS

• 

  Thingmoji

  Turns a photo of an everyday object into an emoji-style sticker, cut out on the device.

  iOS

• 

  idcut

  Passport and ID photo maker that crops to each country's official size and checks it before you print.

  iOS

• 

  Vidrun

  Records three-second clips while you run and cuts them into a film-look running video.

  iOS

• 

  Shade Compass그늘찾기

  Draws the shadows buildings cast on the map, so you can walk on the shaded side at any hour.

  iOS / Android

• 

  LH BarobaroLH 임대분양 바로바로 알리미

  Alerts for new LH public rental and housing sale notices in Korea.

  Android

• 

  Clap Phone Finder박수로 폰 찾기

  Clap, and a phone left on silent answers with sound so you can find it.

  Android

• 

  Giftbook축의금 기록장

  A ledger for the wedding and funeral gift money you give and receive.

  Android

• 

  Shiftcal교대알람

  A calendar and alarm for rotating shift work.

  Android

• 

  Fridge Expiry유통기한 지킴이

  Keeps track of what is in the fridge and warns you before it expires.

  Android

• 

  Quit Again작심금연

  An SOS button for the moment a craving hits, for people quitting smoking.

  Android

• 

  Study Stamp순공 스탬프

  A study timer that records each focused session as a stamp.

  Android

All apps on the App Store and Google Play

How we build

Claude Code agents write and test most of our code and carry each release through the App Store, Google Play and the web, including Byeolheim. The founder, Sungjin Cho, shows how on YouTube (in Korean).

Contact

Business

stefan@starfathom.com

App support

support@starfathom.com. We reply within two business days.