Everything worth showing, newest first. Live products are in the App Store; the rest is in development, finished research, or an experiment that taught me something.
SwipeableLive Compose multi-photo carousels for Instagram on your phone. 2026 · iOS · React Native · Expo · Rust 
mader.xyzIn development This website, fifth edition: portfolio, CV, about and contact. The simulation lab still runs on its own address. 2026 · Web · Zola · Rust 
BänkleLive Find the nearest public bench; a compass guides you there. 2026 · iOS · SwiftUI · Rust API · OpenStreetMap 
Pizza EconomicsLive Which pizza is the better deal? Price per area, settled. 2026 · iOS kiloWattyIn development Sharing surplus rooftop solar power within a region. Software architecture, with Martin Brosig. 2026 · Web platform · Energy SonoIn development A social network for the moment: one sentence, on a shared map. With Leonard Wagner. 2026 · iOS · Rust 
Simulation engineThird rewrite One engine for orbits, fluids, fields and cellular automata. 94 simulations in the browser. 2026 · Rust · WebAssembly · Canvas Science ReelsRunning A pipeline that renders physics simulations into short videos. 2026 · Video · Automation 
Monte Carlo CoagulationThesis M.Sc. thesis: a cheaper way to compute how dust grows into planets, and what it costs in accuracy. 2024 · Research · Python · ITA Heidelberg 
MapMojiLive Place emojis anywhere on a live world map. With Leonard Wagner. 2024 · iOS 
BarWürfelnLive Roll the die and let it pick the next bar. With Leonard Wagner. 2024 · iOS · Swift · Rust API 
Double pendulum and friendsOngoing Physics visualizations on YouTube and Instagram, about 500,000 views. 2022 · YouTube · Instagram Gas accretion onto eccentric planetsThesis B.Sc. thesis at the Max Planck Institute for Astronomy. 2020 · Research · Python · MPIA 
Swipeable Compose multi-photo carousels for Instagram on your phone. iOS · React Native · Expo · Rust mader.xyz This website, fifth edition: portfolio, CV, about and contact. The simulation lab still runs on its own address. Web · Zola · Rust 
Bänkle Find the nearest public bench; a compass guides you there. iOS · SwiftUI · Rust API · OpenStreetMap 
Pizza Economics Which pizza is the better deal? Price per area, settled. iOS kiloWatty Sharing surplus rooftop solar power within a region. Software architecture, with Martin Brosig. Web platform · Energy Sono A social network for the moment: one sentence, on a shared map. With Leonard Wagner. iOS · Rust Simulation engine One engine for orbits, fluids, fields and cellular automata. 94 simulations in the browser. Rust · WebAssembly · Canvas Science Reels A pipeline that renders physics simulations into short videos. Video · Automation Monte Carlo Coagulation M.Sc. thesis: a cheaper way to compute how dust grows into planets, and what it costs in accuracy. Research · Python · ITA Heidelberg 
MapMoji Place emojis anywhere on a live world map. With Leonard Wagner. iOS 
BarWürfeln Roll the die and let it pick the next bar. With Leonard Wagner. iOS · Swift · Rust API Double pendulum and friends Physics visualizations on YouTube and Instagram, about 500,000 views. YouTube · Instagram Gas accretion onto eccentric planets B.Sc. thesis at the Max Planck Institute for Astronomy. Research · Python · MPIA Holiday photos rarely fit one frame. Swipeable lays them out slide by slide: pick a layout per slide, crop, mix photos and video, add text, then preview the result in the feed and the profile grid before exporting. Free, with Swipeable Pro as a single in-app purchase.
The site you are reading. Portfolio, CV, about and contact, built with Zola. The simulation lab still runs on its own address.
Bänkle shows public benches from OpenStreetMap on a satellite map. Pick one and a compass with walking time takes you there; save favorites and see what kind of bench to expect.
Enter two diameters and two prices and the app compares the price per square centimeter, then tells you which pizza wins, or that it is a tie. A small paid app for one question that comes up surprisingly often.
kiloWatty lets owners of solar panels share surplus electricity with people in their region instead of feeding it into the grid. Martin runs the business side; I design and approve the software.
One sentence about the moment, placed on a map that everyone shares. Built with Leonard Wagner for the German market, currently in development.
A Rust engine compiled to WebAssembly that runs every simulation in the lab: N-body gravity with velocity Verlet, chaotic systems with Runge-Kutta, fluid and field solvers, cellular automata and agent models, each with live parameters and presets. Third rewrite, after Python and an earlier Rust version.
Renders simulations from the engine into short vertical videos for Instagram and YouTube, on a server, without manual editing.
Planets start as dust grains that stick together. Integrating the Smoluchowski equation for that is expensive; my thesis sampled the collisions stochastically instead and measured how much accuracy that trades for speed.
Drop an emoji anywhere on the world map and see what everyone else has placed, live. Built with Leonard Wagner.
Can’t decide where to go next? Roll the die and BarWürfeln picks a bar near you, with directions. Our first app together, built with Leonard Wagner.
An old pygame solution to a lecture exercise, recorded and uploaded without expectations in December 2022. The double pendulum video alone passed 450,000 views; the channel has grown into a series of physics visualizations.
Hydrodynamic simulations with FARGO2D1D, analyzed in Python: planets on eccentric orbits carve broader, shallower gaps into their disk and accrete gas faster.
Nothing in this category yet.