Every tool here works out its answer in your browser and shows how it got there. The first time you use one, we ask for your email address and send a 6-digit code to confirm it. After that the tools are unlocked on your device, and the same confirmation works on our sister sites. The privacy page says exactly what we keep and why.
The entrance checker is the first tool. It takes the compass bearing of your main door, finds which of the 32 entrance padas it falls in, and shows what the Brihat Samhita says, where the two English translations differ and what modern guides add. It scores nothing and predicts nothing. It is a lookup into a very old table, shown with its limits. The guide to the entrance explains the table in full.