# Uper SEO Auditor
> Chrome extension for SEO specialists and developers. Provides real-time debugging of Web Vitals, Schema.org, GTM, and JS errors directly in Chrome Side Panel.
- URL: https://spoko.space/uper-seo-auditor/
- Published: 2026-01-28
- Tags: chrome-extension, seo, web-vitals, javascript, analytics, gtm, open-source
---## Professional SEO Tool for Developers

Chrome extension for comprehensive SEO analysis directly in browser Side Panel. Uper fills the gap between simple meta-tag readers and heavy crawlers, offering real-time debugging for modern SPA applications. Tool built by Senior Software Engineer with years of experience in technical audits and frontend optimization.

## Core Features

### Web Vitals with SPA Support

Continuous monitoring of **LCP, CLS, and INP** with native *Soft Navigations* support. Plugin correctly collects metrics in React, Next.js, and Vue applications, where traditional tools only measure performance during hard page reloads. Instant notification of metric degradation without launching Lighthouse.

### Google Services and DataLayer Debugging

Verification of Google Tag Manager events, Consent Mode status, and detection of CSP or Ad-blocker blocks "on the fly". DataLayer Inspector shows all events pushed to the data layer with every user interaction. Eliminates the need to launch heavy GTM debugging modes.

### Design System and Tech Stack Detection

Automatic color extraction with export to Tailwind, UnoCSS, or CSS variables. Precise identification of frameworks (Vue.js, React, Next.js), UI systems (Bootstrap, Tailwind), CDN infrastructure, and analytics tools. Detailed list of fonts, their weights, and loading sources.

### Content and Meta Tags Analysis

Realistic SERP preview with title and description length validation. Heading hierarchy analysis (H1-H6) and keyword density statistics (single words, bigrams, trigrams). AI support for content optimization directly in Side Panel.

### Sitemap Analyzer

Built-in crawler for mass auditing hundreds of URLs from sitemap in seconds. Plugin automatically detects sitemap.xml and allows verification of HTTP statuses, meta tags, and response times. CSV export of results for further analysis or reporting.

### Schema.org and Structured Data

Validation of JSON-LD, Microdata, and RDFa with built-in Schema.org definitions database. Detection of structural errors and missing properties required by Google Rich Results. Preview of Search Console rendering.

### Side Panel as Command Center

Native Chrome Side Panel enables work without context switching. Ability to freely navigate the site, test purchase paths and forms with real-time metrics preview. One-click PDF report export.

## Technologies

The plugin is regularly updated with new features and available for free in Chrome Web Store.