App that automatically finds gap ups and gap downs

I know such a thing exists.. can anyone recommand a good one?

A software that will report all the large gap ups... and gap downs before the market open?


Would be very appraciated.

Thanks

 

www.stockfetcher.com

 

Does Stockfetcher work in real-time or is it only for delayed quotes or EOD?

 

ib has a market scanner column for gaps. As price move or %move.