01 Live · v1
Multi-system emulator
ShadowBoy
Every console you grew up with — now playable together.
Visit ShadowBoy ↗- macOS
- Windows
- Linux
- Android
4 platforms
01 / 06 Product engineer & maker
CASEY
COLLIER.
I’m an independent developer. I build my own cross-platform apps — emulators, desktop tools, mobile — and I design and build websites for other people too. Made with intent, engineered to last, shipped end to end.
02 / 06 Products
Things I’ve
built & shipped.
02 Live · macOS · 7-day free trial
App-aware clipboard manager
Abby
Clipboard history that remembers where your work happened.
Visit Abby ↗- macOS
$4.99 one-time
03 Live · v1
- macOS
- Windows
- Linux
100% verified writes
04 In development
Focus companion for ADHD
Continuum
Pick up exactly where your head left off.
Coming soon- iOS
- Android
Soon launching
03 / 06 Multi-system emulator
ShadowBoy
One core, every system
A single emulation core drives dozens of classic systems with accurate timing, instant save states, and rewind that actually feels good.
Cloud multiplayer
Rollback netplay over the cloud. Invite by link and play together with near-zero perceived lag — the netcode does the hard part.
Play anywhere
Native apps for macOS, Windows, Linux, and Android keep one library in sync across every device. iOS is next on the bench.
Runs on macOSWindowsLinuxAndroid
04 / 06 App-aware clipboard manager
Abby
Clipboard history that remembers where your work happened.
Abby groups what you copy by the app and the kind of content it is, then brings the right snippets, links, files, colors, and images back with fast restore shortcuts.
Get Abby ↗caseycollier.cc
#5CC8FF
design-spec.pdf
{ "ok": true }
git push origin
scroll →
01
Smart Context
Abby ranks clips by the app you’re in, recent restores, pins, and recency — so the right work floats to the top first.
02
Content Groups
Links, images, files, colors, JSON, commands, and text stay grouped by what they are, instead of collapsing into one endless log.
03
Useful Previews
Preview screenshots, color swatches, formatted JSON, copied links, and file details before you put anything back.
04
Workflow Actions
Open copied links, reveal files on disk, pin reusable clips, or restore recent work — all from quick keyboard shortcuts.
Why Abby
A small tool with a name that matters.
Abby is named in memory of my daughter. I wanted it to be useful in an everyday way — quiet, fast, and present while someone is deep in their work.
That’s why it’s built around context. Abby doesn’t just keep a list of copies; it remembers where they came from, what kind of thing they are, and how they help you move through the next task.
Pricing · giving back
Try Abby free, then keep it for $4.99.
$4.99 one-time
7 days free trial
50% to DanceBlue
50% of every Abby sale supports DanceBlue, which helps pediatric cancer patients and families through the University of Kentucky.
Download Abby for Mac ↗⛁ WRITING…
- ○
Can’t flash the wrong disk
Internal and system drives are detected and greyed out, so the only thing you can write to is the USB you actually meant to.
- ○
Verified every time
Bootsie checksums the drive after writing — so you know the image is intact before you reboot into it.
- ○
One click, any image
Point it at an ISO, pick your drive, and go. No flags, no terminal, no guesswork.
06 / 06 Portfolio
Sites I’ve
designed & built.
Marketing sites, landing pages, and storefronts — for clients and my own projects.
scroll →
Health & wellnessHealthyFitMD
2025A clean, trustworthy marketing site for a physician-led health and fitness brand.
Business siteCRSBH
2025A polished, fast website designed and built end to end.
Developer toolTypedFetch
2025A landing + docs site for a developer tool — fast, technical, and clear.
Product siteShadowBoy
2025The launch site for my multi-system emulator — animated, immersive, on-brand.
Your project
could be next.
+ What I offer
Services.
- 01
Product engineering
Cross-platform apps built end to end — desktop, mobile, and web. I take it from the first prototype to a product that ships, updates, and holds up in the real world.
- Cross-platform apps
- APIs & backends
- Release pipelines
- 02
Websites that move
High-craft marketing sites and landing pages where the motion serves the story instead of distracting from it — and turns visitors into users.
- Marketing sites
- Landing pages
- GSAP / WebGL
- 03
Design & systems
Interface design and reusable design systems: the look, the components, and the rules that keep everything consistent as it grows.
- UI design
- Design systems
- Prototypes
- 04
Build & advise
A senior pair of hands for teams moving fast — architecture decisions, performance work, and reviews that raise the bar without slowing you down.
- Architecture
- Performance
- Code review
Let’s work together
LET’S
BUILD.
Got a product to ship or a site that needs to move? I’m product engineer & maker — and I’m open to new work.