Apps
Extremely Successful Apps
Small apps that respect your data: focused software for iPhone, iPad, and Mac, plus Swift packages and developer tools built from real day-to-day needs.
Visit the app siteApps, books, podcasts, travel, and side quests
The front door to Holger Krupp on the internet.
By day an aerospace engineer, online a builder of privacy-friendly apps, an author, a podcaster, and a keeper of interesting internet corners. This page is the short route to the projects, stories, and experiments worth knowing about.
- Build Small Apple platform apps and developer tools.
- Write A book about forty years of fighting game history.
- Talk Long-running podcasting about retro games, drinks, and nerd life.
- Wander Travel notes and stories from the road.
Featured projects
The places to start.
Each destination has its own tone and audience. The homepage now acts less like a business card and more like a curated launchpad.
Book
The History of Fighting Games
A deep dive into the genre's arc from arcade beginnings to modern communities, built for people who love design history, competition, and game culture.
See the book
Podcast
Dirty Minutes Left
A German-language weekly ritual since 2011: retro games, caffeinated drinks, and the kind of nerd talk that only gets better with time.
Listen in
Travel
Hier is' auch nett
Travel stories, updates from the road, and the longer-form side of life online. Less launch page, more diary with distance and context.
Read the travel blog
Social
Mastodon
The quickest way to keep up with new releases, posts, thoughts, and the occasional breadcrumb to whatever is being built next.
Follow @_holgerPhotos
Photos and visual side projects
There is also a visual thread running through this work: photography, images from the road, and the kind of side projects that are easier to show than explain.
Elsewhere
Pick the format you like best.
Some people arrive for privacy-friendly apps, others for retro game history, podcasts, or travel posts. However you found this page, the links below will get you to the version of the internet I spend time building.
What you will find
Small software, big hobbies, and a lot of persistence.
Most of these projects have been growing for years. They are made independently, usually with a bias toward privacy, clarity, and keeping things enjoyable for the people who use them.
About
Independent work with a long memory.
Holger Krupp has been publishing on the internet in different forms for years: apps, podcasts, travel writing, and game history. Rather than forcing everything into one brand, this site acts as the calm center that helps people find the right project quickly.
- Clearer first impression Visitors understand the range of work in seconds, not after clicking blind.
- Built to grow New online projects can be added as cards or quick links without breaking the composition.
- Still personal The page keeps your artwork and tone instead of turning into a generic social link directory.