The two engines nobody else sells as software.
Most property businesses should start with the API. It is far cheaper and you find out whether your audience wants it before committing to an app.
Every kundli app on the store looks identical. Vastu and numerology are what clients actually pay consultants for, and almost nobody has built them properly as software.
Tell us roughly what you need. We reply within one working day, and we will say plainly if something cheaper suits you better.