Jet Callen

Projects

Things I've built, am building, or have experimented with.

Driftlog

active

A minimal journaling app that uses location data to tag entries automatically. Built for people who think better on the move.

React NativeSQLiteMapKit

Typeset

active

A command-line tool for converting Markdown documents into beautifully typeset PDFs, with support for custom templates and font embedding.

RustPDF-libHandlebars

Murmur

in-progress

An ambient sound generator for focus work. Layers field recordings, synthetic drones, and subtle rhythms. Runs entirely in the browser.

Web Audio APINext.jsTailwind CSS

Canopy

active

A read-it-later service that strips articles to their essence and organizes them into a personal knowledge tree. Emphasis on re-reading, not hoarding.

Next.jsSupabaseOpenAI

Gridwork

archived

A CSS grid layout visualizer that lets you sketch responsive layouts with drag-and-drop, then exports production-ready CSS and HTML.

TypeScriptSvelteCSS Grid

Experiments

Half-Life

experiment

A bookmarklet that shows the decay rate of your open browser tabs — how long since you last visited each one. A gentle nudge to close what you're not using.

JavaScriptChrome APIs