So you want to know what the implied vols were in the past? You would also want to look at skew, days untill expiry etc.
Just a number like VIX doesn't really tell you much if you want to trade options... it's very limited really. ATM implied vol can drop, while the wings (OTM) rise... then your VIX-type measure might rise depending on the weightings... or drop...
Or skew rises a lot... also changing that measure, while not really saying where it came from, if you don't keep track of skew.
So in reality, you need a whole lot more than just that VIX measure.
Any platform that provides IV Rank does the studies. Two that come to mind are the TD platforms and Bloomberg - Bloomberg is pricey for some users. It's also more of a historical for futures as there may be no robust source for IV.