STACK IT FAST shows how real software is actually built. Each of its 129 production stacks (Supabase, Cal.com, n8n, PostHog, Langfuse, Temporal and more) is read from the project's source code and pinned to a commit, with a layered stack, an architecture diagram, key design decisions and self-hosting notes.
Next to every stack sits the rule set that keeps an AI coding agent on it: AGENTS.md, Cursor rules (.mdc) and installable Claude Code / Agent Skills (SKILL.md). A 2-minute survey recommends a stack per layer with a starter prompt, and head-to-head comparisons put similar tools side by side.
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