Koos Looijesteijn
How to migrate passwords from Proton Pass to Apple Passwords
APIs are cool
How I publish bookmarks on this website
The Proper Art of Writing
Free Vectors, PNGs, Mockups & Backgrounds | rawpixel
OKLCH Color Picker & Converter
Site of Sites | The Best Web Design Inspiration 2026
Fluid type scale calculator
VFD Displays
Recent — Design Inspiration
The Scrambled Eggs My Dad's Made 100,000 Times
Color Game — How Well Can You Remember Colors?
How I estimate work as a staff software engineer
You've Never Seen a Real Photo
So your boss built a prototype — mynameismartin
Just a Design List — A curated directory of design practices
“Use links, don’t talk about them.” – Unsung
Shader Lab | basement.studio
Microsoft’s carbon emissions went up 25 percent last year
Lantern Slides of Norway (ca. 1910)
How I repaired our oven with a piece of Lego
New euro banknotes
How dirty is your AI use?
What I learned from my second Astro-Jekyll migration
How to make a video archive
brrr
Conditional Border Radius with Modern CSS
I do care
Will I regret buying a new Mac?
How I do web design
Orchid ORC—1
Some practical examples of view transitions to elevate your UI
Koos (@kslstn) / Cosmos
How We're Redesigning Audacity For The Future
Blend video with your website’s background
Responsive video is (almost) easy now
Aurel's Grand Theater
Polychrom | Figma
191 Social Proof Examples
ARIA - a Collection by Manuel Matuzovic on CodePen
Bar | Charts.css
Amaterasu - Empower your mental health journey
OKLCH Color Picker & Converter
Free Online Form Builder | Tally
Big Trek from Big Tech
Bounded rationality
Interoperability between UI design tools
Brutalism is not great for looking relatable
Broken or brutalism: personal websites in 2018
Hey Koos, do you still recommend WordPress?
Things I learned from doing a side project
Why side projects fail
Vue is a great JavaScript framework for designers
What is color?—Color theory in design
How I design ‘mobile first’
New design pattern: Drag To Tag