🛠️ Daily Tool Projects

Free browser-only tools: ID & passport photo maker (AI background removal, 4×6 print sheet), image format converter (JPG/PNG/WebP batch), QR code generator (URL/WiFi/vCard), and image compressor. No upload, no signup.

A design-token API for agents and developers. One seed color becomes a full OKLCH color system with light/dark themes, verified against WCAG before it returns.

12 interactive 3D math visualizations: Lorenz attractor, Euler's formula, wave/heat equations, Fourier epicycles, matrix transformations, GBM, Taylor series, polynomial roots, trig unit circle, Riemann surfaces, Mandelbrot/Julia sets.

AI-powered academic writing & peer review. Step-by-step paper wizard with literature search, auto-review per section, math verification. Peer reviewer scores papers on 7 dimensions. Enter your Anthropic API key to start — no backend needed.

Real-time market demand analysis for indie developers. Pulls live data from HN "Who is Hiring" and Reddit (r/forhire, r/SideProject), categorizes posts into 10 opportunity buckets, surfaces trending keywords, and highlights top demand signals.

Interactive US geography learning app for kids. Clickable map of all 50 states, state capitals, flags, fun facts, and a quiz mode with multiple question types. Built for Eric to practice geography.

Comprehensive interactive chemistry site. Full 118-element periodic table, 3D atom model with real protons & neutrons, electron shells, element origins (Big Bang → supernovae), element stories, quiz mode, chemical reactions, and competition prep. Fully bilingual English/Chinese.