Blueberry and Irulan, thanks for bringing my attention that link. I've finally been off the road and with some spare time enough to look at it.

The app is interesting. It is certainly a good starting point, particularly if you're mostly looking at saddle height. I looked at the screen capture images in the blog post and there are a lot of things going on with this man's fit that would not be addressed by the app. In summary, he looks to have poor hamsting flexibility and/or core strength. Clues to that are in his spinal and upper extremity posture. What was cool about this for me is that I feel like I could give someone some really good feedback about fit issues on their current bike that should be considered when purchasing a new bike. It gave me some confidence that using photos to help make purchasing decisions could often be very helpful.

Thanks for the information.