What are some alternatives?
When comparing MetaTagTools.com and SiteGuru, you can also consider the following products
MetaTagsTool.com - Meta Tag Analyzer, Simulator, & Generator
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
OpenGraphTool.com - Open Graph Checker Tool
SEOmator - SEO website analysis & audit tool
OpenGraphTags - Open Graph Tag Simulator
Deepcrawl - Hosted SEO spider to analyze and find problems with websites.