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Every tool runs 100% in your browser — zero servers, zero tracking. Plus practical articles & tutorials for modern developers.
Search 85+ tools · works offline after first load
§ 01 — Why developers trust it
Every tool executes locally. Nothing is uploaded — your code never leaves the tab.
No analytics on your inputs, no accounts, no cookies you didn’t ask for.
Load once and keep working on a plane. All 85+ tools, no paywall.
§ 02 — Toolchain index
A taste of the kit — all 85+ tools run in your browser.
§ 03 — Latest writing
JavaScript
A production-minded LiteRT.js guide for running compatible AI models locally in the browser, from conversion and WebGPU execution to fallbacks, memory cleanup, caching, and testing.
LLM
Context engineering, not prompt engineering, is what keeps AI agents coherent past a few turns. This guide covers the four core techniques (write, select, compress, isolate) with runnable Python examples for each.
AI Agents
A practical breakdown of GitHub Copilot's new AI Credits billing — how tokens convert to dollars, what every plan includes, and how to keep one agent session from eating your month's allowance.
§ 04 — Guided learning
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Open tool →AI Agents
A practical guide to securing remote MCP servers with OAuth 2.1-style discovery, PKCE, resource-bound tokens, token validation, and production-safe scopes. Includes a checklist, runnable Express middleware, and the failure modes developers usually miss.