StocKi
independent · one-person studio

StocKi means “the things Seulki has stacked up.” Games built one by one after work, small apps made for everyday needs, and research that sorts the market every morning. A one-person dev studio.

Browse apps Browse games Ki Lab
0apps live
0coming soon
0stores
1person
stocki — zsh

      

    

  






  

    
01~/apps

    
Everyday apps

    
Small tools for everyday life — they open right inside the Toss app.

    

      
SearchLive
Company Search
Look up a company’s size and headcount trend instantly from National Pension workplace data.
toss
Open →

      
Public dataLive
See You Again
Find missing-person reports filed with the Korean National Police in one place.
toss
Open →

      
HealthLive
Vision Check
An eye check that explains your prescription numbers in plain words. Not a medical diagnosis.
toss
Open →

      
LearningLive
Talk in a Foreign Language
Pick a partner, friend, travel local or coworker and practice chatting in English or Japanese.
toss
Open →

      
Community3DLive
Gazua Abbey
A 3D space where you pray together for the stocks you cheer on — a way to watch the market with a smile.
toss
Open →

      
StocksLive
My Stock Risk
Shows how risky your holdings are across six risk indicators. No stock recommendations.
toss
Open →

      
LifestyleSubscriptionLive
Our Fridge
Track ingredient expiry dates and get recipes from what’s left. 529 recipes.
toss · app store soon
Open →Shorts ↗

      
LifestyleSubscriptionLive
Expiry Keeper
Keeps gift-card and coupon expiry dates encrypted on your device and shows the urgent ones first.
toss · app store soon
Open →Shorts ↗

      
SecuritySubscriptionLive
Password Notebook
Passwords stay on your device only. PC/web sync, emergency access and temporary sharing included.
toss · app store soon
Open →Shorts ↗

    

  






  

    
02~/games

    
Games

    
From the Moonlight idle series to a pixel platformer — on Toss and ONE store, App Store in 2027.

    
Swipe sideways →

    

      
Moonlight Reaper titleMoonlight Reaper battleMoonlight Reaper gear
Idle RPGFreemiumLive
Moonlight Reaper
Become a reaper of the underworld: reap souls with a chain-sickle and open the Book of the Dead for relics.
onestore · toss soon · app store 2027.03
ONE store →

      
      
      
Moonlight Rogue screen
Idle RPGFreemiumLive
Moonlight Rogue
Drag to move across a top-down field; let go and your rogue roams and slashes on its own.
toss · onestore · app store 2027.02
Toss →ONE store →

      
Ninja Sion screen
ArcadeLive
Ninja Sion
A 2D platformer: auto-walk through a stone castle and climb with jumps and ladders.
onestore · toss soon
ONE store →

    

  






  

    
03~/soon

    
Coming soon

    
Apps I'm building right now. Release dates will be shared once they're set. Icon art is AI-generated.

    

      
GameIn progress
Monpung
Pop the mud monsters clean with water balloons!
In progress

      
JournalIn progress
Haru Hanjul
Leave one line a day, and the needle stitches a reply.
In progress

      
JournalIn progress
Lock Diary
One line a day, sealed in moonlight. A diary only you can open.
In progress

      
HabitIn progress
Haru Routine
One step a day, like crossing stepping stones.
In progress

      
GameIn progress
Moonlight Stairs
A moon rabbit climbing home, 30 seconds at a time.
In progress

    

  






  

    
04~/tools

    
Web & tools

    
Web tools you can open right now, plus programs built for myself or on request.

    

      
ResearchRunning
$↗
Stock Research Site
An in-house algorithm sums up the market every morning and highlights stocks worth watching. Free, for reference only — not investment advice.
Open →

      
Dev toolsRunning
Ki
Ki Lab Toolbox
Notepad, OCR, Base64 and query-string tools right in the browser — nothing stored on a server.
Open →

      
SearchRunning
Company Search (web)
The web version of the company search, built on National Pension workplace data.
Open →

      
To-doRunning
☑
CheckList
A to-do list you can use without signing up. Checked items get a strike-through, and everything stays in your browser.
Open →

      
AI toolsPersonal
%_
Claude Usage Status Line
One line under Claude Code showing session, 5-hour and 7-day usage plus tool status.
2026.10 · showcase only

      
DesktopPersonal
♪
YouTube Audio Saver
A Mac/Windows app that saves just the audio of a YouTube link as MP3, M4A, WAV or FLAC.
2026.04 · showcase only

      
TradingPersonal
⇄
Auto-trading Program
Places orders for my own account only through the Kiwoom API, based on the research site. Runs only on my own MacBook.
2026.07 · showcase only

      
ImageCommission
◐
Photo Retouching Tool
Upload a photo, describe the look you want, and get it back retouched to match.
2026.08 · showcase only

      
UtilityOn request
{}
Odd-job Utilities
Small programs made on request for people around me.
ongoing · showcase only

    

  






  

    
about

    
Stock + Ki

    

    

      

        
Stock — what is stacked

        
Not just shares. Things built and stacked with care, the capital you start with, the trunk that holds up a tree, the stock every dish begins with. I believe good services start from well-stacked basics.

      

      

        
Ki — Seulki’s energy

        
The Ki in the maker’s name, Seulki. Ki as in energy (氣), and the Key that opens doors. By day I verify other people’s services as a QA engineer; in the hours I carve out, I do planning, development, QA, marketing and support alone — and stack up my own.

      

    


    

      TypeScriptJavaScriptPythonSwiftC#HTML · CSSSQLShellPowerShellBatchLuaPHP
    

        
I use vibe coding — but rather than handing things off to AI, I wield it as a tool — what to build and why, how far it got and where it went wrong are my calls, and I verify everything myself.

  

    
100%solo-made · planning to support

  






  

    
origin

    
The one who found issues
started building

    
“Do you even know how to develop, raising issues with me?”

    

      
I do QA for a living. Finding issues in other people’s services, over and over, is my job.

      
One day a developer asked me exactly that. Rather than getting angry, I thought they had a point. Pointing at a maker’s work without ever having made anything yourself isn’t right — not these days.

      
From that day I built things one by one and studied one by one. StocKi is my answer to that question.

    

    

      
QA What it means when someone qualified in QA builds

      
    
        
  • Before building, I think first about where it will break.
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  • Before shipping, I run it end to end with my own hands.
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  • After shipping, I take the support emails and fix things myself.
    • 
      

      
Check more carefully. Build more carefully.

    

  






  

    
changelog

    
The log so far

    

      
  • CompanyRegistered StocKi as a business — officially started as a one-person studio
  • GamesMoonlight Reaper · Mage · Rogue and Ninja Sion launched on ONE store
  • GamesMoonlight Archer 1.0.14 — hunting continues while you’re away, shipped to Toss and ONE store together
  • Toss · appsLaunched Gazua Abbey · Our Fridge (subscription) · Expiry Keeper (subscription) · Password Notebook (subscription)

      
  • GamesLaunched Moonlight Archer — the first game, on ONE store and Toss
  • Toss · appsLaunched Vision Check · Talk in a Foreign Language · My Stock Risk

      
Show earlier entries
      
  • Toss · appsLaunched See You Again — missing-person info in one place

      
  • Toss · appsLaunched Company Search — the first Toss mini-app
  • ProgramsBuilt a photo retouching program (commission)

      
  • WebReleased the stock research site · company search web
  • ProgramsAuto-trading program based on the stock picks (personal use)

      
  • WebReleased Ki Lab — the start of a toolbox built for everyday QA work

      

    

  






    
Stack by stack, wisely.

    
What you stack becomes capital, and capital becomes the strength to build the next thing.

    

      Contact StocKi