Tech Stack Detector
Find the CMS, analytics, frameworks, and tools any website runs on, grouped by what they do.
This is one slice of the full scan
A full Stackra scan adds a Growth Readiness Score, expert AI reviews, and a prioritized action plan across your whole site.
Understanding your tech stack
Your tech stack is the combination of tools running on your site: the CMS, analytics platform, CDN, payment processor, chat widget, A/B testing tool, and everything else. Knowing what is there tells you where performance problems are likely to originate, what your competitors are using, and whether your tools are working against your speed and SEO goals.
How can I tell what CMS a website is built on?
Most platforms leave readable fingerprints in the page source. WordPress sites typically have /wp-content/ in image and script paths. Shopify injects scripts from cdn.shopify.com. Webflow uses specific class naming conventions and its own CDN. This detector reads those signals — response headers, script sources, meta tags, and DOM patterns — and groups them by function. Any detection below 80% confidence is flagged so you know where the read is less certain.
Does my CMS affect my search rankings?
Not directly, but your CMS heavily shapes your Core Web Vitals, and those do affect rankings. Based on Chrome field data, Shopify sites pass all three Core Web Vitals on mobile about 78% of the time. WordPress sits around 48%, partly due to plugin bloat slowing load times. The CMS you choose, combined with how it is configured, matters more than the name on the box.
Source: HTTP Archive / CrUX Technology Report, February 2026.
How many third-party scripts is too many?
Sites with more than 20 third-party scripts (analytics, chat, ads, A/B testing, heat maps) consistently show slower load times and worse Core Web Vitals scores. Every tag runs on your visitor's device and competes for bandwidth and CPU time. The fix is rarely to remove everything. It is to audit which tools are actually earning their place and which ones were installed and forgotten.
Can my competitors see what tools I'm running?
Yes, easily. Most tech stack signals are readable from the page source without any special tools. That cuts both ways: you can see exactly what a competitor is running, and so can they. If a competitor recently dropped a heavy tag manager or switched to a faster CDN, that kind of change typically shows up in their performance scores within a quarter.
What should I do with this information?
Use it as a starting audit. Look for tools you are paying for but not actively using, third-party scripts with no obvious owner, and platform-level decisions that may be costing you speed. If you want to see the full performance and SEO impact of your current stack, run a complete Stackra scan. It ties the tech read to your actual Growth Readiness Score, Core Web Vitals, and a ranked action plan.
Related guides and checklists
Keep going with hands-on guides and a checklist you can work through on your own site.