Google Sandbox and Penalty Checker Tool
Active age of a domain should not be confused with the date of registration on a domain's WHOIS record, but instead refers to the time when Google first indexed pages on the domain. Keyword competitiveness refers to the search frequency of a word on Google search, with observation suggesting that the higher the search frequency of a word, the increasing likelihood that the sandbox filter effect will come into play.
Google Sandbox Checker Tool
While the presence of the Google Sandbox has been long debated, Google has made no direct disclosure on the matter. However, as the sandbox effect almost certainly refers to a set of filters in play for anti-spam purposes, it is unlikely Google would ever provide details on the matter. In one instance though, Google's John Mueller, has mentioned that "it can take a bit of time for search engines to catch up with your content, and to learn to treat it appropriately.
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