H7active
A sports-motivation platform built on a belt system with levels H0 to H8+. Move, log activities, climb the belts. Web in seven languages, prerendered and indexable; native Android app with activity tracking and notifications.
Agentic engineer
Motion designer
The same person. The work is below.
NodalityJS
A user interface as two arrays: what exists, and what is done to it. Declarative pages with GPU shader effects, morph transitions, SEO prerendering and an AI-agent surface. Zero dependencies.
Eveny
Does your schedule vary between odd and even weeks? Customize both and stay on top of your time. Widgets, App Intents and Apple Intelligence, also on macOS and Apple Watch.
Spatial Motion
A procedural node editor for Apple Vision Pro: generators, cloners, effectors and fields with typed connections, keyframed on a real timeline. The 3D preview is your room: you walk around the composition as the graph re-evaluates in real time.
Networky
Struggling with abstract networking concepts? Networky turns complex theory into interactive AR visuals and step-by-step walkthroughs that make learning networking intuitive and fun.
Relays
Find a partner for any relay race in the world. Sign up as a swimmer, biker, runner, kayaker or paraglider, or offer yourself to an existing relay. The world's first chat app written in SwiftUI. The web version at relays.app runs on NodalityJS.
Runny
The most effective running app on the market: effective pace measured without warm-up and cool-down phases, effective cadence, heart rate and more. iOS 18 lock-screen and Control Center widgets.
Spatial Network
A new way of social networking: create and share messages with text and images in 3D space. On Apple Vision Pro the messages live in your environment, with spatial motion design.
Vývoj aplikací ve SwiftUI
A Czech book on building apps with SwiftUI. Published by Grada.
Motion & design
I also design things.
Open source & teaching
Other projects.
- Bone.swift Swift library for dumping underlying UIKit/AppKit views ↗
- Kerny Minimal x86 kernel written in assembly and C ↗
- Pin.swift Auto Layout library for apps before SwiftUI ↗
- Think.js JavaScript ML and shape-recognition library ↗
- Create your own React Udemy course: build a React-like library from scratch ↗
- Spatial Gravity Explore gravity on different planets, in AR ↗
Off the keyboard
Sport.
An avid runner and climber. The belt system in H7active is not theoretical.
- 800 m
- 2:00
- 1 K
- 2:37
- 3 K
- 8:49
- 5 K
- 15:14
- 10 K
- 32:22
- Half
- 1:09:25
- Marathon
- 2:33:34
- Climbing
- 8− UIAA
About
The story so far.
I am a Swift and JavaScript developer from the Czech Republic. I started coding in September 2015 as a JS programmer, then picked up Swift and iOS. My first app, Swimrun World, was accepted on the App Store in December 2018, and that was all the encouragement I needed.
In April 2019 I released Runny, a running app built around effective pace, followed by Relays, the world's first chat app written in SwiftUI. In November 2020 my app Eveny was featured by Apple in the “Widgets Get an Upgrade” story, fulfilling a dream.
Today I build H7active and the NodalityJS library, and design motion, increasingly with AI agents as part of the toolchain. Aside from coding I run, climb, and from time to time fire up After Effects or Houdini.
