The application is created as a replacement of the free metafields application written by Caroline.
Please note that Metafields is a Shopify feature and it has nothing to do with SEO. Do not confuse it with meta tags for html.
For more information about Metafields, please read this blog post from Shopify.
The interface is very simple and you can perform all tasks on a single page. You can add new metafields for products, modify existing ones, and delete existing ones.
Currently, only metafields for products and variants are supported. Other metafields can be added if there is enough demand from the community.
Given this is a free application, we cannot provide much support.
Why pay more when you can get it for free!