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How I Built a Browser Color Picker with WCAG and APCA Contrast Checking

Picking a color from a webpage sounds like a simple task. However, I found that many browser eyedropper extensions provide only a HEX value and stop there.Designers and developers often need more information:RGB, HSL, HSB/HSV, and CMYK valuesA magnified view for accurate pixel selectionSaved colors for building a paletteContrast information for accessibilityA quick workflow that does not interrupt browsingThat led me to build Color Picker Eyedropper, a browser extension for selecting and evaluat

Recursion clicks the moment you can see the call stack

Recursion is the concept where a huge number of people quietly decide they're "not a math person" and give up. Not because it's genuinely that hard — but because it's taught as words on a page for something that is fundamentally about motion: a function calling itself, a stack growing and unwinding. You can't see any of that in a static code snippet, and that invisibility is the whole problem. It's exactly why I built AlgoVerse. The call stack is invisible, and that's why recursion is hardW

Scrap

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Belgian car salesman becomes prince after DNA test proves royal parentage

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How I built a 17-page admin panel with Next.js 16 (and the bugs I fixed along the way)

After months of work, I launched Nexus — a Next.js 16 starter kit with a full admin dashboard. Today I'll walk through how the 17-page admin panel works, the architecture decisions, and two sneaky bugs I had to fix.The goal: edit everything without codeThe hardest part of building a landing page template isn't the landing page itself — it's making every word, image, and price editable WITHOUT touching code.When I started, the question was: "How do I let the buyer change anything, anytime, withou

Educational tools deserve production-grade polish

Educational software has a look. You know it the second you see it: clunky, dated, built like the content was the only thing that mattered and the experience was an afterthought. That reputation is mostly earned — and I think it quietly sabotages learning. So with AlgoVerse, I refused to accept it. Why "it's just a learning tool" is a trapThere's an unspoken assumption that educational tools get a pass on polish — that if the information is correct, the janky interface is forgivable. It isn

From React Basics to Production Next.js: The Complete Roadmap

Here is a structured, fast-track study guide to take you from React fundamentals all the way to building production-grade applications using Next.js.This flow ensures you build a rock-solid mental model of the "older" core React concepts before layering on the powerful server-side paradigms of modern Next.js. Phase 1: Core React EssentialsBefore touching a meta-framework, you need a deep understanding of standard client-side React. If you are coming from an MVC background or another framewo

I Built a Password Strength Calculator That Never Sends Your Password Anywhere Here's the Entropy Math

Type Your Real Password Into a Random Website. What Could Go Wrong?Go search "password strength checker" right now. Look at what you're being asked to do: paste your actual password — the one you maybe reuse, the one guarding your email recovery — into a text field on a website you've never heard of, with no visible indication of whether that string is being logged, sent to an analytics endpoint, or quietly saved in a form-tracking tool bolted onto the page.Most of these tools could be doi

Building a Real-Time Market Microstructure Analyzer for Indian Equities

Financial markets produce enormous amounts of data—but converting raw order-book updates into meaningful liquidity and order-flow signals requires more than displaying prices on a chart.I built the Real-Time Market Microstructure Analyzer, an open-source research platform that processes five-level order-book snapshots, calculates market microstructure indicators, and displays the results through an interactive dashboard.🔗 Live demo: https://aariiparekh3012-collab.github.io/quantproject2/💻 GitHub

I got tired of AI code assistants breaking our project architecture, so I built ArchSentry

Hey everyone,Lately my team has been using Cursor and Copilot a lot. While it writes code super fast, I kept noticing that it quietly breaks architectural boundaries in our PRs. For example, it would start writing raw database queries straight inside API route handlers instead of using our repository layer, or importing internal modules across domain boundaries.ESLint and standard linters didn't really catch this without writing tedious custom AST plugins, and paying for AI review bots just to c

How to build high-converting in-app announcements without sacrificing INP & LCP

We recently ran Lighthouse audits across 40 top B2B SaaS web applications. Over 65% of them were failing Interaction to Next Paint (INP) and Largest Contentful Paint (LCP) targets.The culprit? Legacy onboarding and changelog widgets injecting 120KB–250KB of uncompressed JavaScript on initial page load.Here is a benchmark breakdown and how to get in-app experience infrastructure down to under 4KB. The Hidden Cost of Enterprise Onboarding ScriptsLegacy tools like Appcues or Pendo were designe

Why I Built Amazon Store (So I Don't Have to Pick a Country)

I run a handful of small content sites — Perl School, Readabooker, Mercurial Albums, and a few others. They're all different niches, but they share one thing in common: they link to products on Amazon, and those links carry my associates tag.If you've ever tried to do this properly, you already know the problem. Amazon isn't one store, it's dozens — amazon.com, amazon.co.uk, amazon.de, amazon.fr, amazon.co.jp, and so on — each with its own catalogue, its own currency, and its own associates prog

Anthropic Rewrote Bun in Rust With 64 Claude Agents for $165K. The Real Bill Is Higher

In December 2025, Anthropic bought Bun, the JavaScript runtime with over 22 million monthly downloads, and then ported its entire codebase from Zig to Rust. The port was done in 11 days by 64 parallel Claude agents at a reported cost of $165,000 in tokens. Those numbers have traveled far, usually attached to a prediction: frontier AI providers will one day charge real per-token rates for software development, and developers who can still read code will become rare specialists.The core facts chec

ElevenLabs, TwelveLabs, ThirteenLabs

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How I Built an Anomaly Detection System for Critical Infrastructure

Critical infrastructure does not usually announce failure.It whispers first.A sensor drifts a little. A vibration pattern changes slightly. A machine still “looks fine,” but not quite. That is the problem with these systems. By the time the failure becomes obvious, the cost has already gone up.That is why I like anomaly detection. It sits in that awkward but important space between raw data and real operational decisions. It is not just about spotting weird numbers. It is about helping people ca

Keeping a graphics-heavy React app at a smooth 60fps

A 3D visualization that stutters doesn't just look bad — it actively teaches the wrong thing. If your sorting animation hitches, a learner reads the hitch as part of the algorithm. So on a graphics-heavy educational app, 60fps isn't polish. It's correctness.Hitting it consistently was the real engineering challenge in AlgoVerse, and the fix is a pattern worth stealing for any interactive app. The trap: computation and rendering fighting for the frameThe naive way to animate an algorithm is

A Friendly Introduction to Racket

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JSON.parse Lied to Me: Incremental Parsing for Half-Arrived AI Responses

Last Tuesday I pointed a small chart dashboard at MonkeyCode's free server and asked the model to stream a JSON object with the data I needed. The first chunk arrived, my trusty JSON.parse threw SyntaxError: Unexpected end of JSON input, and the entire dashboard went blank while the network tab kept delivering perfectly valid bytes. How many times have you blamed the network when the parser was the real problem? The model was innocent, the server was innocent, and my parser was the only guilty p

observekit: Typed Browser Observers Without the Boilerplate

observekit is a typed, zero-dependency wrapper over five native browser observer APIs:MutationObserverResizeObserverIntersectionObserverPerformanceObserverReportingObserverIt brings them under one consistent API:observekit.elementobservekit.selectorobservekit.attributeobservekit.childrenobservekit.textobservekit.resizeobservekit.visibleobservekit.performanceobservekit.reportsEvery method returns a Disposer ({ disconnect(): void }) and shares the same base options:signaloncedebouncetimeoutonConne

I used my own component library as a stranger, and it found four bugs

I write a component registry for interfaces that hold a lot of data. It has demos, it has a docs site, it has a test suite. What it did not have was a real application built on it by somebody who could not reach into the source, so I built one.The rule I set myself was that nothing could shortcut. Everything came from the published CLI against the live registry, no workspace link, no local path. If something was awkward I had to feel it rather than fix it from the inside.Four things broke.The ta