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The EULA (end-user license agreement) is shown below, near the end of the menu buttons. The main source of income from this site is through advertising and the program will not run unless you agree to accept advertising. RideTheGearTrain does not use cookies or any personal information, but Google Advertising does. Details are given in the EULA below and this includes instructions for controlling Google.

This program calculates the Gear Train Ratio (GTR) required to produce the thread you requested, then attempts to find a new gear that could be added to your preferred gear train to get the required GTR and thread. Start by going through items 1-5A in the menu. When it comes to entering a thread pitch or TPI, choose a single value not a range. Then choose this step again. The program replaces each gear in the train, one at a time. Since this is restricted to the preferred gear train that you entered, it does not find all possibe gears, but merely hints at some possibilities. When a new gear is listed it is presented as a link that you can click. This adds the gear to your personal list and runs the usual program again to allow you to look for any new threads it produces.