Retroix
A from-scratch arcade engine. Seven games, one shared leaderboard.
Open danmat.github.io/Retroix Source Read the post: “I wrote an arcade engine from scratch, and seven games share one leaderboard”
Projects
Everything I have shipped, with the live links. The deep dives are on the blog.
GAMES
TRAVEL
droppin / waypoints
Your Google Timeline export, turned into a private travel map.
Open droppinmap.com Source Read the post: “Your Google Timeline is the most sensitive file you own, so I built a map that never uploads it”
MEDIA
earshot
Your audiobook year, pulled from Audible.
Open earshot.danmat.dev Source Read the post: “Audible has no API, so I registered a fake device and built my audiobook year anyway”
Anime suite
Three tools around my MyAnimeList account. Rate, review, keep in sync.
Crunchyroll to MAL sync
Watch history to MAL, reviewed weekly before it writes.
Private
COLLECTING
PhilatelyOS
AI vision cataloguing a 100,000-stamp collection. Not public yet.
Private
Numistoria
An ancient-coin museum told as one story. 296 coins, 20 worlds.
Open numistoria.danmat.dev Source Read the post: “How I stopped an LLM from fabricating citations”
stamp-grader
Honest stamp centering from a photo. No inflated grades.
Open stamp-grader.danmat.dev Source PyPI Read the post: “A stamp grader that shows its work and refuses to guess”
Stamp Atlas
The public face of philatelyOS: a stamp atlas that publishes candidates for a human to verify and treats "I do not know" as a valid answer.
Stamp Atlas
The public face of philatelyOS: a stamp atlas that publishes candidates for a human to verify and treats "I do not know" as a valid answer.
FINANCE
Divvy
Replay your investing history against a different portfolio.
Open divvy-backtest.streamlit.app Source PyPI Read the post: “I replayed the money I actually invested into portfolios I never owned”
Aegis
A stock research harness where AI advises but deterministic rules decide, and it grades itself honestly against the index.
Private
Aegis
A stock research harness where AI advises but deterministic rules decide, and it grades itself honestly against the index.
Private
TOOLING
packkit
Project scaffolding that does not care which AI you use. CLI, MCP, web.
@danmat
Small npm libraries. First up, an HTTP QUERY (RFC 10008) toolkit.
View on npm Source Read the post: “HTTP finally has a QUERY method, so I wrote the client for it”
Master
Nimbus CMS
A PHP CMS an agent can run. This site runs on it.