Houseofmvps

Opentechalyzer — Development skill for Claude Code

Development community

Free, open source website technology detection.

How to install Opentechalyzer

This entry records only its repository, not the path inside it, so there is no exact command to give. Open Houseofmvps/opentechalyzer and copy the folder into ~/.claude/skills/, or the file into ~/.claude/agents/.

What Opentechalyzer does

Free, open source website technology detection. Identify any site's full tech stack from its URL — CLI, library and MCP server for Claude, Claude Code, Codex and ChatGPT. No API key, no credits, no subscription.

Alternatives in Development

Tech Stack — デフォルト技術スタック定義 974 ★
Tech Stack Analyzer — Analyze and recommend technology stacks 663 ★
TalkingHeads — A library to communicate with ChatGPT, Claude, Copilot, Gemini, HuggingChat, and Pi 322 ★

README

Opentechalyzer

**Free, open source website technology detection. No subscription, no API key, no per-lookup credits.**

Point it at any URL and it tells you what the site is built with, who they buy software from, how to contact them, what security posture they have, and which known CVEs affect their stack. Point it the other way and it tells you every site running a given technology.

Runs as a **CLI**, a **TypeScript library**, and an **MCP server** so Claude, Claude Code, Codex, ChatGPT and Cursor can use all of it directly.

npx opentechalyzer stripe.com

**Cost:** everything runs on your machine. No hosted service, no account, no API key, nothing to pay. The single exception is [`ota reverse`](#does-this-cost-me-anything), which queries a public dataset on **your own** Google Cloud project and is free under Google's 1 TB monthly allowance.

What you get
Install
Commands
Enrichment field sets
Use it from Claude, ChatGPT, Codex
Library API
Output formats
Reverse lookup
What it detects
How it works
Accuracy benchmark
What it cannot do
Contributing

What you get

Capability	Command	What comes back
Full tech stack of a URL	`ota example.com`	588 fingerprints across 55 categories, each with a confidence score and the evidence behind it
Bulk lookup	`ota -i domains.txt -f csv -j 10`	One row per technology per URL. Thousands of domains, no rate limit, no credits
Contact details	`ota example.com --crawl --fields contact`	Emails, phone numbers, WhatsApp, found by crawling contact and about pages
Social handles	`--fields social`	X, LinkedIn,