This is where everything we're working on lives — half-finished experiments, shipped projects, and the in-between. Each one will get a short write-up of what it is, why we built it, and what we learned. Poke around.
XmarkBuilds is an independent studio that likes shipping small, useful things. Most of what we make lives on this domain: webapps built for daily use, tools that solve one specific problem, and the occasional client site. We'd rather ship something rough and improve it in the open than sit on a perfect idea.
We work mostly with Python and React, plus whatever else a project asks for. Lately we're focused on stock-data analysis and interactive web apps — using Python to turn messy data into something you can actually look at and reason about. If something here looks useful, or you want to build together, our inbox is open.
Want the longer version? Read more about the studio and how we work →
A free, no-code stock charting and strategy backtester. Chart any ticker with 65+ technical indicators, build entry and exit rules visually, and backtest them with real metrics. Built for our own research, then opened to the public.
A baseball card collection laid out on the field. Pick a season and a team; the lineup stands at the positions they played most that year, and each player opens the cards the collection holds for them, ready to flip. Built for a single collection today, structured to grow into a bigger collecting site.
Nothing in this category yet — check back soon.