Next.js SEO Checker

Audit your Next.js site for the most common SEO, rendering, and crawlability issues — prioritized from critical to low.

Based on "Optimising Vibe-Coded Next.js Apps" by Will Kennard

20 checks across 7 categories

Rendering & SSR

Server vs. client rendering issues

Metadata & Head

Title, description, Open Graph, canonical

Performance

Core Web Vitals signals

Images

Optimization, alt text, lazy loading

Structured Data

JSON-LD, schema markup

Crawlability

Robots, sitemap, links

Semantic HTML

Headings, landmarks, ARIA

Why Next.js sites need a dedicated SEO audit

Next.js is one of the most popular React frameworks, but its flexibility is a double-edged sword. AI coding tools and vibe-coded apps frequently default to "use client", which causes content to render only in the browser.

The result: search engine crawlers and AI systems (ChatGPT, Claude, Perplexity) see an empty HTML shell instead of your actual content. This is the #1 Next.js SEO issue found in professional audits.

This free tool checks your site's server-rendered HTML for the most common pitfalls — from missing metadata and broken structured data to render-blocking resources and client-only content — prioritized so you know what to fix first.

Checklist based on research by Will Kennard — free tool by Aiso