Klaus Neuendorf
Entertainment
5.0· 2 ratings
Spooky sounds, AR characters, selfie looks & stickers for Halloween
neuendorf.dev
Apps that delight — on the App Store for over a decade.
Twelve apps of my own — designed, built and maintained by me to this day. They are my references for your project: strategy, design and engineering from a single source.
01 — Work
My own apps as references
Each of these apps is a project of my own: idea, design, code, App Store presence and support all come from me — many of them I have maintained for more than ten years. Tap an app to learn more.
Sports
4.2· 16 ratings
GPS timing & driving data analysis — 0–60, laps, sectors
Education
4.8· 5 ratings
Discover the world through play — made by parents for parents
iPhoneiPad
Lifestyle
4.6· 94 ratings
The only Christmas bell you will ever need
iPhoneApple WatchiMessage
Lifestyle
4.6· 82 ratings
Countdown to the new year — iPhone, iPad, Watch & TV
iPhoneiPadApple WatchApple TViMessage
Productivity
4.8· 4 ratings
Find & replace reinvented — with CSV import
iPhoneiPad
Education
5.0· 3 ratings
Manage school grades and keep the average in view
iPhoneiPad
Navigation
The smart travel time helper for multiple destinations
iPhone
Games
A cool, tricky puzzle for the Apple TV Remote
Apple TV
Stickers
Handmade Christmas stickers for your chats
iMessage
Stickers
Stickers for true party animals
iMessage
Stickers
Lovely baby-themed stickers — for proud parents
iMessage
02 — Services
What I build for you
Have an idea for an app, or want to take an existing one further? I take your project from the first sketch to the App Store — and beyond. For every service you will find one of my own apps where I have already done exactly that.
iPhone & iPad apps
Native apps built with Swift and SwiftUI — fast, clearly structured and seamlessly at home on the system. From lean utilities to data-rich apps.
Reference
Apple Watch, Apple TV & iMessage
Extensions for the entire Apple ecosystem: Watch apps as remote controls, the big stage on the TV and sticker packs for Messages.
Reference
AR, camera & audio
Placing characters in the room with augmented reality, real-time face effects, voice recordings with effects and precisely timed sounds.
Reference
GPS, sensors & data analysis
Capturing location and motion data, analyzing it with sensor fusion and making it understandable in maps, charts and 3D — including external Bluetooth hardware.
Reference
Deep system integration
Live Activities and the Dynamic Island, widgets, Siri and Shortcuts, the Action button, iCloud sync and sharing, and Apple Health.
Reference
Launch & long-term care
In-app purchases without forced subscriptions, privacy by design, localization into more than 20 languages, App Store presence, landing page and updates over many years.
Reference
How a project works
Step 01
Idea & concept
Together we sharpen the goal, target audience and scope — and define what the first version needs to deliver.
Step 02
Design & prototype
Clickable mockups show early on how the app will feel — before the first line of code is written.
Step 03
Development
Native development in Swift. Regular test builds let you follow the progress right on your iPhone.
Step 04
Launch & care
I handle the App Store release and keep your app up to date with updates and support.
Let's talk about your app.
Tell me briefly about your idea — I will get back to you with a first assessment.
03 — Reviews
From the App Store
App Store · US
“I like the app - very beautiful design! The timer was really cool when we used it last XMAS - the kids loved it 😍 🎄”
Cool app for Santa 🎅
sunny_boy_90 · Golden XMAS Bell
App Store · US
“Loved the Apple TV support! I put it on all my tvs for my New Years party was a hit. …”
Awesome App
Halfemt80 · New Year's Eve Counter
App Store · US
“look, I haven't written a review in years, but the fact that this app is so awesome caused me to go for it. This app is so incredibly important for anyone who likes to play with words. It's a secret superpower that I hav…”
ABSOLUTELY ESSENTIAL
Srini Kumar · TextReplacer
04 — Profile
About me
Hi, I'm Klaus. I have been building my own apps for the Apple ecosystem since 2013 — from the first idea through design and code to the release on the App Store.
What started as a passion alongside my studies has grown into a small portfolio of twelve apps — across every Apple platform: iPhone, iPad, Apple Watch, Apple TV and iMessage.
Every app is built independently: concept, UX, Swift code, App Store presence and support. I care about apps that feel fast, clear and well thought out — seamlessly at home on the system they run on.
I live in Nürtingen in Baden-Württemberg, Germany. When I'm not working on an app, you will usually find me building a new feature prototype or trying out the latest Apple technologies.