Find Next.js evidence such as __NEXT_DATA__, /_next/static assets, Next.js headers, rendered runtime hints, and SEO output quality.
The scanner fetches the public page, follows a limited redirect chain, collects headers/resources/HTML, applies self-owned detection rules, checks SEO/security/accessibility/performance signals, and returns evidence-backed fixes.
Private IPs, localhost, file URLs, and internal hostnames are blocked to reduce SSRF and abuse risk.
People searching this topic usually want to verify a real website, see proof, and decide what to fix next. The first screen stays focused on that task: enter a URL, run the scan, review evidence, then copy the fix list.
Keyword cluster: nextjs detector · next.js detector · is this site nextjs
The report groups technology, SEO, security, accessibility, performance, redirect, robots, sitemap, and schema findings into a prioritized action list.
It checks __next_data__ script evidence, /_next/static assets, next.js header/runtime hints, server-rendered metadata, javascript payload and performance signals and returns a shareable Themerella report with evidence and fixes.
Yes. The first workflow is free and URL-first: enter a public website URL, run the scan, and review the report before any paid monitoring or API layer.
Themerella shows evidence, confidence, issue severity, and developer-ready fixes instead of only listing detected logos or generic advice.