Simple developer tools
built with zero bloat

Gemini Flash doubles on 1 January, and the 200K cliff is worse

Google's headline Flash rate is promotional and reverts on 1 January 2027. We ran three real workloads through the change, and found a second, sharper problem hiding above 200K tokens on Gemini 3.1 Pro.

August 27, 2026

TUTORIAL

Tutorial8 min read

Why your React useEffect is revoking its own blob URL

An image tool that worked exactly once, then failed on every adjustment. The file format was innocent. A cleanup effect keyed on the URL it revokes was destroying its own source image.

August 24, 2026

A terminal card reading: the phrase more than one child node fires on one, above the literal next/og error Expected div to have explicit display flex or display none if it has more than one child node

Tutorial8 min read

next/og: Expected div to Have Explicit display: flex, Fixed

Satori throws this error when a div has one child, not just when it has several. Here is the actual rule, the four cases where the message misleads you, and what each workaround costs.

August 19, 2026

Financial dashboard showing charts and market metrics on a screen

One Week in the AI Money Machine: $25B in Bonds, a Record IPO, and a Moratorium

Amazon raised $25 billion in bonds, SK Hynix pulled off the largest foreign US listing ever, Meta committed to doubling compute, and New York hit pause. All in the same two weeks.

July 15, 2026

Abstract illustration representing artificial intelligence and neural networks

GPT-5.6: What Sol, Terra, and Luna Actually Mean for Developers

OpenAI shipped GPT-5.6 as a three-tier family: Sol, Terra, and Luna. Here's the pricing, the new caching rules, and which tier your workload actually needs.

July 15, 2026

A clean programmer desk setup with lines of code visible on screens

Autonomous Coding Agents Redefining Software Development

Autonomous coding tools like Claude Code and specialized environments are shifting the developer role from writing code to orchestrating logic.

July 10, 2026

A terminal window open on a laptop with code on screen

Tutorial5 min read

Run Two Claude Code Accounts at Once (Personal + Office)

Claude Code has no account switcher yet, but one environment variable lets you keep a personal and an office login active at the same time. Here's the full setup.

July 1, 2026

Code on a laptop screen with React components

Tutorial8 min read

React Server Components in Depth: What They Are and When to Use Them

React Server Components fundamentally change how we think about rendering. This guide breaks down how they work, how they differ from Client Components, and the patterns that will make your Next.js apps faster.

April 24, 2026

VS Code editor open on a monitor showing code

10 VS Code Extensions That Actually Make You a Better Developer

Skip the bloated extension packs. These 10 VS Code extensions have earned a permanent spot in my setup, each one solves a real problem, ships no junk, and earns its memory footprint.

April 22, 2026

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The tools

Everything runs in your browser. Nothing gets uploaded.

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LLM API Cost Calculator

Compare what a workload costs across Anthropic, OpenAI, Google and xAI, including prompt caching, batch rates and long-context tiers.

Token Counter & Context Visualizer

Paste a prompt or file to estimate its token count, see how much of each model's context window it fills, and what it costs to send.

Subdomain Finder

Find every subdomain of a domain from public Certificate Transparency logs and passive DNS, then check which ones still resolve.

HEIC to JPG Converter

Convert iPhone HEIC photos to JPG, PNG or WebP in bulk. Runs on your device, so your photos are never uploaded to anyone.

Resize Image to KB

Compress a photo or signature to a maximum file size in KB, at the exact pixel dimensions a form requires. Finds the highest quality that still fits.

Developer Resume Builder

Build a developer resume with 3 ATS-friendly templates, then export a clean, text-based PDF. No account, no watermark — your data stays in your browser.