The StackOptic Blog
Practical guides on identifying website technologies, SEO and GEO, web performance and lead generation — from the team behind StackOptic.
Can AI Crawlers (GPTBot, ClaudeBot, PerplexityBot) Access Your Site?
AI engines can only cite content they can crawl. Here are the major AI user agents, how to check whether you are blocking them, and how to decide who to allow.
How to Check If Your Site Is Ready for AI Search (GEO Audit Checklist)
A practical, prioritised checklist to audit your site's readiness for AI answer engines — access, structure, content, authority and the technical basics — and how to fix the gaps.
What Is llms.txt, and How to Check Yours
llms.txt is a proposed standard that gives AI models a clean, curated map of your most important content. Here is what it is, what goes in it, and how to check and create one.
Technographics Explained: Using Tech-Stack Data to Qualify Leads
What technographics are, how they differ from firmographics, where the data comes from, and how B2B teams use a company's tech stack to qualify, prioritise and personalise.
How to Build a B2B Lead List From a Website's Tech Stack
A step-by-step framework for turning website technology signals into a high-converting B2B lead list — defining your ICP by technology, sourcing, scoring and staying compliant.
How to Find Shopify Stores and WordPress Sites for Outreach
If you sell apps, themes, plugins or services for Shopify or WordPress, here is how to find, verify and qualify stores and sites on each platform — and pitch them without spamming.
How to Find Websites Using a Specific Technology (for Sales & Outreach)
Four practical ways to build a list of websites that use a given technology — for sales prospecting, partnerships and market research — plus how to turn that list into outreach that converts.
What Website Builder Is This? How to Detect Wix, Squarespace, Webflow & More
Website builders leave unmistakable fingerprints. Learn the exact tells for Wix, Squarespace, Webflow, GoDaddy, Weebly, Framer and Carrd — and how to read them in seconds.
How to Find Out What E-commerce Platform a Website Uses
Identify the e-commerce platform behind any online store — Shopify, WooCommerce, Magento, BigCommerce and more — using asset domains, headers and checkout tells.
How to Find Out What Fonts (and Colors) a Website Uses
Five ways to identify the exact fonts a website uses — plus how to pull its colour palette, tell self-hosted from Google Fonts, and stay on the right side of licensing.
How to Tell If a Website Is Built With Shopify (and Find Its Theme & Apps)
Six reliable ways to confirm a store runs Shopify, then how to uncover its theme and apps — plus the tells that survive a custom domain or a headless build.
How to Check If a Website Uses React, Vue, or Angular
A practical guide to detecting the JavaScript framework behind any site — React, Vue, Angular, Svelte and meta-frameworks like Next.js — using devtools, globals and DOM fingerprints.
How to Find Out Where a Website Is Hosted (Hosting, CDN & Server)
Trace any website's hosting provider, CDN and origin server using DNS, WHOIS, reverse lookups and HTTP headers — and learn why a CDN can hide the real origin.
How to Tell If a Website Is Built With WordPress (and Find Its Theme & Plugins)
Seven reliable ways to confirm a site runs WordPress — then how to uncover the exact theme, plugins and version it uses, and when those signals are deliberately hidden.