Designer + developer/Stuttgart, DE/Updated May 2026

Felix
Keller.

What I do

I design and ship small, considered products. Often for the web. Lately for Android and Garmin too.

Toolkit

React + Next.js on the web. Kotlin + Compose on Android. Monkey C on Garmin.

Right now

Just shipped AirPipe. Building Digivice for Garmin. Get in touch →

Spotlight.

001 · FEATURED · 2026
NEW · MAY 2026

AirPlay, on Android.

Turn any Android phone into an AirPlay source for the speakers you already own.

AirPipe preview
Role

Design, brand, engineering

Stack

Kotlin · Compose · libairtunes

Released

May 2026 · v1.0

Platform

Android 9+ · Google Play

Visit airpipe.appGet it on Google Play

Currently building.

002 · DISPATCH · IN PROGRESS
Live work · Nights & weekends

Digivice for Garmin.

A faithful port of the original D3 (Japan Edition) onto Garmin's ConnectIQ: every screen, every battle interaction, every cabling quirk, running on the watch that's already on your wrist.

Project
Personal · Fan port
Role
Design + engineering
Platform
Garmin Instinct · Forerunner · Vívoactive
Stack
Monkey C · ConnectIQ SDK
Status
α 0.4 — battle loop live
Follow the build log
Personal · Fan port · WIP
α 0.4 · 2026
Digivice sprite
Monkey C · ConnectIQGarmin Instinct / Forerunner

Selected work.

003 · INDEX · 2018 — 2026
16 projects · 2018 — 2026

Web development.

11 · SHIPPED + PROJECTS
01
Tierlist.appFrontend · 2023
Create and customize tier lists of your favorite movies, series, games, and more. Organize, rank, and share your top picks easily with tierlist.app!
ReactSupabaseNext.js
LIVE
02
YT-HistoryFrontend · 2021
Have you ever wondered how much time you spend on YouTube? Or how many videos you've watched over the years? Or maybe which channel you've watched the most? This site will answer all these questions and much more!
ReactJavaScriptCSS
LIVE
03
Trail-AppFrontend · 2021
Fitnesstrail Mosbach - "Auf historischen Spuren durch die Stadt"
ReactFirebaseContentfulGraphQL
LIVE
04
GrouBeeFrontend · 2021
Zusammen besser planen.
FirebaseReactJavaScript
PROJECT
05
Octo-WaffleFrontend · 2020
Share your favorite recipies with the community
ReactFirebase
PROJECT
06
Docker-Doc(k)Developer · 2020
This repository is a German introduction website to Docker software.
HTMLCSS
LIVE
07
IDEAFrontend · 2020
Got a brilliant idea to change the world? Share it with the community!
ReactMongoDB
PROJECT
08
Book-ListFull stack · 2019
The principle is simple: search for a book or author and get detailed information about your search.
CSSHTMLPythonSQL
ARCHIVE
09
Gatsby PortfolioFrontend · 2019
This site is build using GatsbyJS, a modern site generator. It is my first progressive web app with a bunch of cool features like dark/light modes and offline support.
React
ARCHIVE
10
WarblerFrontend · 2018
Everyone knows Twitter. And here is my little version of it.
ReactMongoDBJavaScript
ARCHIVE
11
OmnifoodDeveloper · 2017
One of my first projects which led me to frontend programming.
HTMLCSS
ARCHIVE

Design.

2 · SCREEN DESIGN
Cover image for BWC Watches

BWC Watches

2020

A full-fledged screendesign about a fictional watch company

Developer
Adobe XDPhotoshop
Cover image for Interior design

Interior design

2020

A Website redesign about a interior design company

Developer
PhotoshopFigma

Other — 3D, animation, film.

3 · MIXED MEDIA
Cover image for Nintendo Switch
Developer

Nintendo Switch

2021

Nintendo Switch 3D Model Infographic

FigmaBlender
Cover image for Bee Movie
Developer

Bee Movie

2021

A blender animation short film about bees

BlenderAdobe Premiere
Cover image for Image Film
Developer

Image Film

2020

An image film about a riding stable in France

Adobe Premiere
See the full archive16 projects · 8 years · indexed by year + stack

Have a project?
Let's talk.

Reply within 48h · Stuttgart, DE
© 2026 Felix Keller — Made with careGITHUB