01 / 16Game
Lina Chess
An offline chess lab that explains every move
Independent studio in Seoul · 20 products
Useful,
beautifully.
From mobile apps to web services and desktop tools, we begin with a clear need and shape it into a product worth keeping.
Product families
We choose the screen and platform that best fit the problem and the moment.
The right form for the need.
Our point of view
Not for everyone. For someone who needs it.
Every CommonSource app begins with a concrete problem. We design the moment a person actually faces before counting features.
Law, learning, radio, vehicles, reading and games may look unrelated. The rule is the same: deep, quiet and built to last.
Web service
Ready when the moment calls.
Web service · Coming later
No web services have been announced yet.
Desktop products
No uploads.
Just your computer.
Windows · macOS
Image utility
CrystalCut
Fast images. Private processing.
AI background removal, object selection, brush refinement and batch conversion in one workspace.
Windows · macOS
Storage utility
SizeTree
See your storage. Review cleanup with evidence.
Understand disk usage through fast local scanning and a polished sunburst, then review cleanup suggestions with explicit safety boundaries.
Windows · macOS
Disk explorer
FileTree
Navigate the file system like a map.
Native scanning, radial and treemap views, duplicate detection and evidence-based cleanup review in one workspace.
Windows · macOS
Archive & file utility
LinaZip
Pack together. Split apart. Extract exactly what you need.
Create ZIP and 7z archives, open multipart RAR downloads, browse archive contents and recover intact ZIP entries—all on your device.
Selected apps
Six very different worlds.
02 / 16Productivity
Lina Scanner
Sharp documents. Private by design.
03 / 16Lifestyle
Lina Viewer
Every comic and book in one beautiful library
04 / 16Education
Ttokttoki Lina
Build the habit of pausing before a suspicious screen
05 / 16Productivity
LinaPad
Return to the recording through the notes you wrote
06 / 16Productivity
Lina Notes
One place to write, listen and find what matters
Student access
Access the app you need for learning without the cost barrier.
Students and exam candidates can request one of a limited number of app access codes each month.
16
Mobile apps
—
Web service
4
Desktop tools