Most active call & put options at one glance. Options Open Interest heatmap.
https://iframe.quantsapp.com or https://cobranding.quantsapp.com
https://iframe.quantsapp.com/synopsis/Option-OI or https://cobranding.quantsapp.com/synopsis/Option-OI
<iframe width="800px" height="560px" src="https://iframe.quantsapp.com/synopsis/Option-OI" sandbox="allow-scripts allow-same-origin allow-forms " frameborder="3"> </iframe>