Lightwave – Real-time notes app, 3.5 years of hand-rolled JavaScript
3.5 years hand-rolled JS avoiding frameworks, but notes+tasks space is saturated.

Covers ES2025 features like Set Methods before most tutorials even mention them.
JavaScript developers wanting to master modern syntax without local setup
Scrimba · Codecademy · freeCodeCamp
More than a decade ago I had built paw-on-es6 to help folks get hands-on with ES6 (ES2015). It did its job.
I am now introducing ESlabs. It covers every major feature from ES2015 through ES2025.
You write real code in your browser, run exercises, and actually internalize what the features do and why we need them in the first place.
The irony isn't lost on me: building a tool to help humans learn, in an era where the temptation is to just use an agent skill!
Give it a spin. Break things. That's the point
3.5 years hand-rolled JS avoiding frameworks, but notes+tasks space is saturated.
jsPerf has owned JavaScript benchmarking for 15 years — this is a cleaner clone without differentiation.
Hand-written engine beats Bun on cold start with a 9 MB binary.
Swapped bloated SVG for tiled JPGs—7 zoom levels, zero runtime dependencies.
Hand-rolled ES256K crypto for AT Protocol in pure Java is genuinely hard.
PM-focused API course with in-browser sandbox; solves real knowledge gap but crowded educational space.