Looking for a DEF ranking site/tool that did a sliding 5 week window

Footclan,

I recall last year or in previous years there was a site or a tool that did a sliding 5 week window of DEF rankings. I found it to be more accurate to how the DEF is currently playing versus what could be skewed ranks from earlier games. Does anyone recall what I’m referring to?

Google searches usually dump me on Week 5 rankings which is not helpful. I’ve checked Roto, The fantasy outsides ( love their DVOA stuff) and obviously the Ballers.