Reverse-Engineer-Marketing: Open-Source Skill Analyses Competitor Growth

X postCorey HainesTool

Corey Haines released /reverse-engineer-marketing, a free open-source skill that analyses public web data to map company growth. It cross-references traffic curves with launches, pricing changes, ads, and tech stacks. The tool helps founders and marketers decode competitor strategies.

Key points

  1. Part of the open-source Marketing Skills repository (53 skills), installed via npx skills add coreyhaines31/marketingskills.
  2. Overlays monthly traffic and brand search curves with product launches, price changes, and campaign starts.
  3. Inspects SEO, citations in AI engines (ChatGPT, Perplexity, Gemini), active ads, DNS records, and certificate logs.
  4. Includes 31 industry packs, funnel tracking, and a monthly Watch mode for recurring updates.
  5. Turns findings into actionable ideas complete with prompts and corresponding skills.

Why it matters

It allows marketing teams, agencies, and founders to dismantle competitor playbooks using empirical public data instead of relying on subjective founder narratives.

Analysis

How It Works and Data Sources

The /reverse-engineer-marketing skill is part of Corey Haines's coreyhaines31/marketingskills suite, usable directly in applications such as the Claude Desktop App. When given a target domain, the skill pulls from multiple public data layers:

  • Traffic & Visibility: Tracks monthly Google search volume, brand search curves, sitemap evolution, and brand citations across AI platforms like ChatGPT, Perplexity, Gemini, and Google AI Overviews.
  • Campaigns & Positioning: Identifies active ad copy, newsletter and podcast sponsorships, launch dates, historic pricing tiers, and homepage headline iterations over time.
  • Technical Footprint: Scrapes DNS records to reveal email infrastructure, detects marketing tool installation dates, and checks Certificate Transparency logs to date new subdomains.
  • Qualitative Data: Scans open job postings to determine scaling channels, transcribes founder interviews for verifiable metrics, and analyses negative reviews to find competitor weaknesses.

Extended Features and Execution

The tool features 31 industry-specific packs ranging from SaaS and DTC to insurance. Beyond one-off reports, it includes a Funnel Hack mode to map onboarding and email sequences, as well as a monthly Watch mode to monitor changes. It synthesises these findings into prioritized tactics, pairing each recommended idea with a ready-to-run prompt. Depending on the depth of the audit, Claude guides the user to install necessary helper libraries and supply respective service API keys.

Original post

Corey Haines

@coreyhainesco · 11 November 2026

The biggest thing I've shipped since Marketing Skills itself! 🆕 skill: /reverse-engineer-marketing — see how any company actually grew using public data. Give it a domain and it: → Charts their monthly Google traffic and brand searches → Dates every launch, price change, ad t.co/frdRq2J5zy

486 likes43 replies1.1k bookmarks33.3k views

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More posts in the thread (2)
  1. npx skills add coreyhaines31/marketingskills → t.co/7i6xKBJt5I
  2. @harrywritescopy 1, Claude Desktop App 2. “Download this skill” 3. “Use the /reverse-engineer-marketing skill on _____” 4. Depending on what you want to do, Claude will have to download other libraries and tools, and walk you through getting API keys for certain services
Selected replies (5)
  • @harrywritescopy @coreyhainesco Hi Corey, looks great. Excuse my ignorance, but what's the easiest way to try it, having not used skills myself yet?
  • @kibaekr @coreyhainesco @harrywritescopy you can try it without installing anything, in an isolated sandbox. I did exactly that to see what @coreyhainesco's skill actually adds: Granola (his demo) and Lovable, Claude Opus 5.5 and GPT-6.1 Sol, each with the skill vs on Auto. Same prompt, 8 runs, judged t.co/mLZWgWGi9w
  • @kibaekr @coreyhainesco @harrywritescopy Granola (Corey's demo): > Retention came first: ~5,000 weekly users in Oct 2024, half still using it 10 weeks later > It spread inside companies: once a firm's leaders adopted it, 136 of ~150 staff followed > A free year for Lenny's Newsletter subscribers (Feb 2025), and a $14 t.co/DCHaasAh8k
  • @kibaekr @coreyhainesco @harrywritescopy Lovable: > The real engine is the "Edit with Lovable" badge. The apps users publish on t.co/uTvNPqyBB9 have outranked t.co/QU42eoZuUp itself since April 2026 (only the skill run measured this) > Partners lent their audiences: Lovable credited co-marketing with t.co/pl8oUdu0H1
  • @kensavage @coreyhainesco 😳😳😳

Mentioned links

Summary generated by AI (Gemini 3.8 Flash, 12 November 2026). It may contain errors – the original source is authoritative.

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