AA does an "estimated" speed first for each arrow it recommends.
Then, after you buy your arrows, weigh them and enter the information. If you are using movable sights and have a standard marker, it requests you take a solid 20 yard mark and a solid 30 or 50 yard mark. You enter the mark readings at those 2 distances and it will provide calculated speed, which is more accurate than a chronograph and then it will give you your sight tapes.
If you don't have a marker on your sight bar, AA can print one for you. That's how I get my pins quickly set for my hunting bow.
You can also add several bows.
My sister wonders why more pro-shops don't use it to recommend arrows for customers.
Here's their link -
http://www.archersadvantage.com/
Perry also has several articles on tuning and uphill and downhill shooting that I have found very interesting and helpful.