For very simple tasks Listly seems to be a fast and good solution: http://www.listly.io/
If you need more power, I heard good stuff about http://80legs.com/ though never tried them myself.
If you really need to do crazy shit like crawling the iOS App Store really fast and keep thing up to date. I suggest using Amazon Lambda and a custom Python parser. Though Lambda is not meant for this kind of things it works really well and is super scalable at a reasonable price.
If you need more power, I heard good stuff about http://80legs.com/ though never tried them myself.
If you really need to do crazy shit like crawling the iOS App Store really fast and keep thing up to date. I suggest using Amazon Lambda and a custom Python parser. Though Lambda is not meant for this kind of things it works really well and is super scalable at a reasonable price.