Freeware frequency analyzer VST?

[53Crëw]

Hey Guys - I'm looking for a freeware frequency analyzer VST that can save or capture multiple frequency response curves and display them simultaneously. I want to compare some guitars/amps/cabs, etc. Anyone have a suggestion?
Thanks.

 

[JonWormwood]

frogsanal span

 

[Mutant]

The best one:
http://www.voxengo.com/product/SPAN/

To compare signals, feed one signal to left and the other to right input.

 

[Jind]

http://www.bluecataudio.com/Products/Product_FreqAnalyst/

 

[Jormyn]

If you set Voxengo SPAN to L+R and pan two incoming signals accordingly, you can look at both curves together. Very handy for trying to match a particular tone, etc.

 

[XnaySaturo]

I used BlueCat Frequency Analyser for a school project. I liked it better than the Voxengo one.

 

[Pipsymbol]

The best one:
http://www.voxengo.com/product/SPAN/

To compare signals, feed one signal to left and the other to right input.

+ 1 to this!