I don't know any web sites.
You just add up the closing price for the past 30 weeks and divide it by 30.
If its above that you buy and hold if its below that you get out.
If I were going to try it now in the new millenium.
I would run some numbers and make some charts to test it.
It wouldnt have worked while Bush was president because the market went side ways.
I don't do it any more because I am retired.
The idea is to make money you have to buy low and sell high.
Following the 30 week average helps you to do that.
You buy when its low but rising and sell when its high but falling.
I would keep a 30 week average on all 3 indexes the dow, sp500 and nasdaq.
then apply the proper index to my investment.
I agree with Buffets methodology of buying good companies and holding.
Which I have done.
I used the 30 week average to make money in risky sectors of the stock maket,
technology, biotech. communications any sector for that matter.