Steven as an astronaut

kreasteve.de

Visualizations, simulations and projects · Portfolio

Open to work Steven as an earthworm, about to be picked up by a heron The early bird catches the worm.

Welcome to my homepage. This is where I show my small ideas and experiments, which grow further whenever there is a reason to. Have fun exploring.

Everything here is built to collect as little data as possible, and works largely offline in the browser.

Latest videos

Video thumbnail: a laughing smiley in a suit holding a microphone between studio lights, title “Studio-Setup Simulator”

Planning a video setup? We build a web app

How Studio Edit comes together: a web app that plans a video shoot – framing, focal length, softboxes, backdrop and microphone, with real light simulation. (Video in German)

Video Video thumbnail: green glowing VFD display with the title “KI trifft Hardware – VFD-Uhr”

AI meets hardware: VFD clock

An old VFD display glows again – as a clock, brought to life with the help of AI. (in German)

Video Video thumbnail: the MarcDough dough logo behind the title “PDF nach Markdown mit MarcDough(n)”

PDF to Markdown with MarcDough(n)

MarcDough(n) kneads PDFs into clean, editable Markdown. (in German)

Video

Webapps

Studio Edit logo: a laughing smiley in a suit with a microphone in front of a presentation board, studio lights on both sides, inside a film strip

Studio Edit

Plan a video shoot on your computer: frame the person, pick a focal length – Studio Edit works out where the camera has to stand. Softboxes, backdrop and microphone placed freely, with real light simulation. Share via link. (German interface)

Webapp Close-up of a thumb and its thumbnail against light fabric

Thumbnail generator

One design, the whole set: YouTube, Instagram, story and link preview, each with a fitting layout. Custom fonts, tone curve, color grading and a key area that stays in every crop. (German interface)

Webapp Sudoku logo: a box of nine cells with the seven missing in the middle

Sudoku

Five difficulty levels, honestly graded: not by the number of givens, but by how much work and which solving technique a puzzle really demands. With notes, checking and hints — and playable by two.

Webapp Lap counter logo: a stopwatch whose dial is a QR code

Lap counter

Counting laps at a sports day: by hand via keyboard and tiles, or by camera reading QR race numbers. Phones can join as extra cameras. Race numbers and certificates come out of the same page.

Webapp Smiling sun with binoculars in space

Das Licht

Live sun position: 3D space view of Earth, shadow cast and sun phases.

Webapp CamStack logo: several stacked camera outlines

CamStack

Camera tools straight in the browser: make movement, edges and what stays behind visible, plus LightPaint. The image stays local — nothing is uploaded.

Webapp Waye logo: stylized eye with a waveform

Waye

Live audio spectrum from your microphone: waterfall display, multi-FFT, peak frequency, note detection and a guitar tuner. Runs right in your browser. The name: wave + eye = Waye.

Webapp

Interactive visualizations

Conversation with headsets in a noisy factory hall

VirtualSpeak

Talking in noisy places as if the room were quiet: virtual silence, automatic talk groups, emergency calls. Runs right in your browser.

Simulation Tube screen with a green sine wave glowing on an illuminated graticule

Cathode Ray Tube

A cathode ray tube computed from its physics: the beam excites the phosphor, which releases its energy again. Everything else follows from that. With an oscilloscope, Lissajous figures and a pointer.

Simulation NFC Programmer logo: WiFi symbol above the words NFC Programmer

NFC Programmer

Handheld device for writing, counting and verifying large NFC tag arrays. Interactive emulation to try out, right in your browser.

Hardware

Repairs

Blue sensor board with an SHT30 and a newly soldered capacitor

Ventilation unit: black display, every sensor in error

A Zehnder ComfoAir Q350 with a dead display and ten sensor errors. It was not the main PCB but a corroded capacitor on the outdoor air sensor. Fault-finding and repair.

Repair
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