In addition to placing your release on their website and in their RSS feed, paid press release providers usually offer a press list to which they will send your press releases. Many commercial sites also provide additional SEO features such as tagging, the ability to change your metadata, and grammar checking.
These PR distribution services are regarded as both trustworthy and SEO-friendly, which are the only types of inbound connections we consider valuable.
Credibility: We checked the SEO industry’s most trusted indicators, Majestic Trust Flow and Moz Domain Authority, to evaluate credibility. The majority of the free sites on our list were deleted as a result of this process. We believe that in addition to added features, paid sites should provide more link credibility, thus we whittled down our list to include only those with high scores.
Search Engine Optimization (SEO): We considered basic SEO capabilities as well. Tags, anchor text links, keyword data, and other search elements are all available on these sites. Most free sites only allow one outbound link, however commercial ones often allow up to eight.