KAPPA OS — the portfolio of John Kappa, product designer in Melbourne

KAPPA OS is a product designer’s portfolio disguised as a miniature desktop operating system. It boots — with a progress bar and a POST line — into a desktop you can actually use: windows with traffic lights, a dock, a working file system, a Trash that remembers where things came from, undo, Spotlight search, keyboard shortcuts, spring-loaded folders and a screensaver. The work is filed on the desktop the way work is filed on a real machine, and you open it the way you would open it there. This summary exists because the desktop itself is drawn in the browser; the sections below describe everything the interface contains.

Last updated 2026-09-12.

About John Kappa

John Kappa is a product designer and builder based in Melbourne, Australia. His background is in branding, UX and web design, across more than two decades. Somewhere along the way the work turned from designing things for other people into making his own — tools, fonts, extensions, experiments. Things that solve a problem or scratch an itch, mostly his own itch.

He is now deep into AI: not the hype version, the practical, hands-on, what-can-we-actually-build-with-this version. He holds that AI doesn’t replace instinct so much as accelerate it, and that the best products are built by people who can think across the whole thing — brand, UX, code, copy, product. Chrome extensions, React apps, iOS and Android, full websites; some take an afternoon and some take months, and the size matters less than that something gets made.

On design itself he is brief about it: good design is mostly clarity and simplicity. Remove the noise, keep only what matters, make it feel obvious in hindsight. He is currently a Lead Product Designer and AI specialist, and is open to collaborators who care about craft and come at problems from unconventional angles. His personal site is johnkappa.com.

What is inside KAPPA OS

The desktop ships with folders for projects, experiments, photography and wallpapers, and a dock of applications. The design language is monochrome, flat and engineered, with colour only in small functional accents — apart from three surfaces that are deliberately physical objects rather than documents. Images dragged in from the host operating system land wherever they are dropped.

• About — the long-form piece on John, set like a case study.
• SNAP — photography, as a WebGL wall of pictures or a dome seen through a lens; both shove around under the cursor.
• Tunes — a music player, deliberately skeuomorphic: a late-80s deck in brushed aluminium with an amber VFD and keys that travel under the finger.
• kappash — a terminal, rendered as a phosphor tube with scanlines and a block cursor, with its own COLOR, FONT and SIZE commands.
• Navigator — a period web browser with tabs, a real full-screen mode and a refused-connection page in the chrome of the era.
• SIGIL — a certificate press: type a name and it strikes a plate for it — serial, class, an engine-turned rosette and a holographic foil, all of it worked out from the name, so the same name always produces the same plate.
• Wallpapers and Settings — the desktop's picture, theme, accent, translucency, window-opening animation and screensaver delay.
• FOURBIE — a game, taking the whole display.
• Contact — the card, with a QR code that hands the phone version over.

Projects

Experiments

Smaller things, built and shipped:

• John Kappa — johnkappa.com
• Gifted — gifted.vercel.app
• Point Dots — point-dots.vercel.app
• Nooodes — nooodes.xyz
• Lookbeast — lookbeast.com
• DCS Tactical Reference — dcs-tactical-reference.vercel.app
• Inventory Tetris — inventory-tetris.vercel.app
• KAPPA OS — kappa-os.com
• Archaeological Greece — archaeological-greece.vercel.app
• Dither Me — dither-me.vercel.app
• Mooodbored — mooodbored.vercel.app

Photography

Shot by John and shown in SNAP, the OS’s photography app, as a wall of uncropped pictures or a dome you turn.

• Japan — 1 photograph: Shibuya crossing, dusk.
• Greece — 7 photographs: Aegean, midday; Whitewash and shadow, Naxos; Chapel door, golden hour; Ferry wake, Piraeus; Under the pergola, beach bar; The Acropolis, Athens; Sarakiniko, Milos.
• Home — 2 photographs: Up in a warbird; The home studio, late light.
• Street — 2 photographs: Double rainbow; Vdq6KwZSLqw unsplash.
• 3D Type — 10 photographs: 22k 1; 22k 2; 22k 3; 27 a; 27 b; Letter design 07 a; Letter design 07 b; Letter design 07 c; Letter design 08a; Letter design 08b.
• Hellenic House — 13 photographs: HHP 475 1 octane; HHP 475 2b 2; HHP 475 2b 3; HHP 475 2c; HHP 475 3 octane; HHP 475 3b; HHP 475 4b3; HHP 475 4b4; HHP 475 4b5; Bearded 01; Bearded 03; Greek museum 01; Greek museum 02.
• 3D Art — 24 photographs: Defender 90 01; Georges Gardet 3; Porsche 911 2; Porsche 911 Carrera A; Porsche 911 Carrera B; Porsche 911 Carrera C; Porsche 911 Carrera D; Water Bubble5; Abstract shapes 0002; Balloon 3; Bananas; Car tyre pirelli; Clay obejcts; Defender 90 10; Defender 90 11; Defender 90 12; Defender 90 13; Defender 90 14; Defender 90 7; Glassware 02; Glassware 03; Glassware 05; Horse; Piece display.

Elsewhere on this site

• Contact — the card built for a phone, reached by QR code from inside the OS.
• Design system — the working vocabulary of the interface: colour, typography, radius, elevation, motion, components, stacking order and sound.
• llms.txt — the same site, written out for language models.

Questions

Contact

• Message John
• LinkedIn — /in/johnkappa
• Twitter / X — @johnkappa
• Instagram — @johnkappa
• Behance — /JohnKappa