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Pick a tech stack that already works.

Tell us what you’re building. We match it to real production architectures and hand your coding agent the AGENTS.md, Cursor rules and skills to build it right.

  • 130 real architectures, read from source
  • Rules for Cursor, Claude Code and Codex
  • Free, open source, no account needed

Question 1 of 16

What are you building?

Team size

Show my stack

Your answers carry over — the survey picks up at question three.

Three ways in

Plan a new project in 16 questions, learn from 130 real ones, or install one of 32 rule sets.

Stack survey

Answer questions about your product, team and constraints. Get a stack matched to real production architectures and a ready-to-run scaffolding prompt.

16 questions · about 2 minutes. Gives you a stack, a diagram and a prompt.

Start the survey

Explore real stacks

How Cal.com, Grafana or vLLM are built: layers, decisions, diagrams and sources.

130 architectures · commit-pinned and cited.

Explore stacks

Rules & skills

Drop-in rules so your agent follows the stack’s conventions from the first commit.

Ships AGENTS.md, .mdc and SKILL.md · 32 stacks, one command each.

Get the rules
New

Your stack, as a card.

Paste a public repo. We read its manifests and make a card you can post: its layers, the projects it is built like, and its stack personality.

github.com/

Reads the public repo’s manifests. Saves a PNG for a post (3:4) or a story (9:16).

Recently shared

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The 5 newest of 130 stacks in the directory.

Browse by category

All stacks

130 architectures across 13 categories. The largest, Developer Tool & API, has 34.

Popular technologies

All technologies

270 technologies tracked; these 12 appear in the most projects and rule sets.

Every stack ships as files

Rules your agent actually reads

32 rule sets, each shipped in 3 formats your agent loads on its own.

All 32 rule sets
nextjs-prisma-postgres/AGENTS.mdNext.js 16 + Prisma ORM + PostgreSQL Backed by 10 production projects.AGENTS.md.mdcSKILL.mdnextjs-drizzle-supabase/AGENTS.mdNext.js 16 + Drizzle ORM + Supabase Backed by 7 production projects.AGENTS.md.mdcSKILL.mdnuxt-vue-postgres/AGENTS.mdNuxt 4 + Vue + PostgreSQL Backed by 5 production projects.AGENTS.md.mdcSKILL.md insights/2026-10.mdJev for Developers: What 648 Open-Source Repos Built in Two Weeks (2026) 648 open-source repositories built around Jev were created on GitHub by 27 September 2026, twelve days after TypeSafe opened early access6 min read

One command: $ curl -s -o AGENTS.md https://stackitfast.com/rules/nextjs-prisma-postgres/AGENTS.md

How a stack gets in

Nothing is described from memory. Every architecture is read from its repository, pinned to a commit, and every claim links to the file it came from.

When the repo moves on, the page is re-audited. These are the numbers today.

Architectures Read from source, pinned to a commit
130
Technologies Each linked to the projects that use it
270
Rule sets & skills AGENTS.md · .mdc · SKILL.md
32
Categories From SaaS to data infrastructure
13
Licence Directory, rules and skills
MIT

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Stack it fast.

16 questions, about 2 minutes, a stack that already works, and the files to build it right the first time.

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