Compare: OpenLink Structured Data Sniffer vs META SEO inspector

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Metric	OpenLink Structured Data Sniffer	META SEO inspector
User count	7,000	200,000
Average rating	4.56	4.37
Rating count	18	629
Last updated	2025-08-18	2026-07-04
Size	2.55 MB	0.39 MB
Version	3.4.27	3.8.22

Short description	Discover and visualize structured metadata (Microdata, RDFa, JSON-LD) embedded in web pages with OpenLink Structured Data Sniffer browser extension.	Explore any webpage’s HTML with META SEO Inspector. Instant metadata checks, JSON-LD insights, smart alerts, and exportable reports to boost SEO.
Full summary	OpenLink Structured Data Sniffer (OSDS) is a powerful browser extension compatible with Chrome, Edge, Opera, and other Web Extensions browsers. It detects and displays structured metadata embedded within HTML documents, such as Microdata, RDFa, JSON-LD, Turtle, CSV, and JSON, presenting it clearly in a Property Sheet format. This extension is essential for Digital Brand Managers, Content Managers, and Semantic SEO professionals looking to better understand how metadata affects search engine results. Simply install OSDS, visit any web page, and the extension icon activates once metadata is detected, allowing instant access to detailed structured data insights.	META SEO Inspector helps web developers and curious users explore what’s hidden behind any web page. Instantly check a site’s HTML for SEO issues, verify metadata, and ensure compliance with Google's Webmaster Guidelines. NEW: open in an always-open sidebar, with one-click insights into all metadata and structured data (including full JSON-LD). Key features include smart alerts for missing or too-short tags, actionable advice to improve Core Web Vitals and search visibility, competitor analysis, easy exporting of metadata, multilingual interface, and a free, regularly updated tool. Perfect for developers, marketers, or anyone curious about what makes a web page tick.