PercentRules is a free Chrome add-on developed by hardly.hacking that aims to simplify the process of analyzing housing investments. This tool allows users to quickly analyze investment properties on popular sites like Zillow, Redfin, and Trulia. With PercentRules, there is no longer a need for manual copy-pasting into spreadsheets or writing down information.

One of the key features of PercentRules is its ability to automatically input information when you're on Zillow, Redfin, or Trulia. This saves users valuable time and effort by eliminating the need to manually enter property details.

Additionally, PercentRules offers calculations for important investment metrics such as the 1% Rule, Cap Rate, and Cash on Cash Formula. These calculations provide users with valuable insights into the profitability of potential investment properties.

While PercentRules is still in development, it shows great promise in simplifying the process of analyzing housing investments. With its user-friendly interface and time-saving features, this Chrome add-on is a valuable tool for real estate investors and enthusiasts alike.