Apps
Table of Contents
I build small, useful products around problems I have myself: keeping track of travel days, understanding health data, making music, and reading long-form articles away from a browser.
DaysAbroad #
A privacy-first iPhone app that automatically tracks how many days you spend in each country. It is built for tax-residency records, Schengen 90/180 limits, immigration compliance, and frequent travelers who are tired of maintaining spreadsheets.
Visit the DaysAbroad website · Read how it works
VitalTrends #
One health timeline across WHOOP, Apple Health, Oura, Withings, and Hevy, with interactive charts, exports, an API, and an MCP server that lets AI assistants work with your data.
Try VitalTrends · See the live demo · Read the build story
Brasil Papaya #
A free native music toolkit for iOS and Android with a guitar and bass tuner, metronome, sound meter, waveform visualizer, and support for Portuguese, English, and Spanish.
Markdown to EPUB #
Paste Markdown or provide a URL and get a clean EPUB for an e-reader. I built it after buying a tiny e-ink reader and wanting a calmer way to read saved articles.
Convert an article · Read the build story
Looking for hardware builds and older experiments? Browse the full projects archive.
Companies I co-founded #
Hotspotty helps teams deploy and manage decentralized physical infrastructure. I co-founded the company and serve as CTO.
DePIN Hub is a discovery, research, and media platform for the DePIN ecosystem, including the podcast where I have interviewed builders across the industry.