What are some alternatives?
When comparing OpenGraphTags and Moz, you can also consider the following products
OpenGraphTool.com - Open Graph Checker Tool
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
MetaTagsTool.com - Meta Tag Analyzer, Simulator, & Generator
Ahrefs - Ahrefs is a toolset for SEO and marketing. We have tools for backlink research, organic traffic research, keyword research, content marketing & more. Give Ahrefs a try!
MetaTagTool.com - Meta Tag & Open Graph Tag Generator, Simulator, & Analyzer
Majestic - Majestic - Link intelligence tools for SEO and Internet PR and Marketing. Site Explorer shows inbound link and site summary data.