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showdev

I replayed the money I actually invested into portfolios I never owned
Divvy is a Python backtester that replays your real contribution dates and amounts into a counterfactual portfolio, dividends included.
A stamp grader that shows its work and refuses to guess
Stamp Grader measures centering from a photo with classical CV, draws the result on your image, and treats cannot-determine as a valid answer.
Three small apps that keep one anime list honest
AniYears, mal-rater, and a review-first Crunchyroll to MAL sync: three tools around one MyAnimeList account, built on one API and one rule.
Audible has no API, so I registered a fake device and built my audiobook year anyway
Earshot pulls my Audible library nightly with a device token, whitelists what it may keep, and renders a static, copyright-safe audiobook retrospective.
I wrote an arcade engine from scratch, and seven games share one leaderboard
A vanilla-JS game engine, seven games built on it, and one multi-tenant Cloudflare Worker plus D1 holding every high score, keyed by game id.