Ping-O-Matic is described as 'We regularly check downstream services to make sure that they're legit and still work. So while it may appear like we have fewer services, they're the most important ones' and is a SEO Tool in the Social & Communications category. There are four alternatives to Ping-O-Matic, not only websites but also apps for. The best alternative is pingoat, which is free. Other great sites and apps similar to Ping-O-Matic are Ping.in (Free), Autopinger (Free) and TotalPing! (Free).
Blog ping service that pings or notifies Weblog Services such as Blog Search Engines and blog directories that your blog has been updated. Thus enabling them to index your blog fast and make your content available for a larger audience.