Different IVP and IV rank on different websites

I am checking this page - https://unofficed.com/implied-volatility-analyzer/ which shows different IV rank and IVP when I compare it to opstra definedge and tradeguide.in – so which one is most reliable?
is there any other website you recommend that shows all stocks and index IV rank and IVP?

I made the tool by hand because I have trust issues with every other site. So, it’s reliable for me. Unsure it will be reliable for you or not.

I will recommend that you calculate by hand and tally. IV is a property of options. Not stocks. Yet, We do the Calculation of IV based on various parameters.

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