The AI handbook for builders

AI tools, terms, and skills, all in one place.

Compare two AI tools. Look up an acronym. Find a prompt that fits the job. Browse skills, workflows, and practical guides for people using AI at work.

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215 skills·56 compares·83 terms·202 prompts

Three ways to start

Install a skill

Hand-written Claude Skills you download once and Claude uses forever.

Browse 215 skills

Pick a tool

Honest head-to-heads on the AI tools you're evaluating right now.

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Look up a term

Tokens, RAG, MCP, agents — every AI term in plain English.

Browse 83 terms

This week

All spotlights

Skill of the Week

Ship an AI Feature on Claude — the gap between a demo and production

A Claude-powered feature is easy to demo and hard to ship. The demo works once on a happy-path input. Production brings weird inputs, costs that creep, hallucinations users see, and no way to tell when quality drifts. This bundle closes that gap.

Prompt of the Week

7 new prompts — research, newsletter, launch, investor emails

Structured paper summaries, cross-study comparison, newsletter issue builder, landing page copy, and two investor update templates.

Tool Drop

Claude Sonnet 5 — close to Opus, at Sonnet price

Anthropic shipped Sonnet 5 on June 30. It lands close to Opus 4.8 on agentic and knowledge-work evaluations at $2/$10 per million tokens through August. The one number to watch is the new tokenizer, which counts up to 1.35x more tokens, so measure real spend before you size a budget.

Sponsored

Deals of the Week — hand-picked from AppSumo

ZeroRank AI$69 · lifetime
Tracks where your brand gets mentioned and cited across ChatGPT, Perplexity, Gemini, Google AI Overviews, and Grok, benchmarks you against competitors, and suggests the content changes that would close the gaps.
Remalt$99 · lifetime
A visual canvas that runs several large language models over your notes, videos, and screenshots to draft platform-ready posts for LinkedIn, YouTube, and Instagram, and lets you wire up custom AI agents for the steps you repeat.
Rybbit$49 · lifetime
Privacy-first web analytics that tracks funnels, individual session paths, web vitals, and error events, with no cookies required. Open-source under AGPL, so you can self-host it or use their cloud. One-click migration from Plausible, Umami, and SimpleAnalytics.