Hey Luc,
I'm testing it out, but there's an android app called Boilr that allows you to set alarms based on % change and time interval. I'm using BlueStacks Android Emulator to run it on my computer. I'll let you know if it seems to work, but you have to set each alarm up separately--yet it seems like you only have to do it once per coin per exchange.
Alternatively you could also run it on your phone. I set a test alarm (1% change in 5 min) and it worked! It could be a poor man's market scanner in the interim, provided you take the time to manually add an alarm for each crypto (unsure if there's a max alarm limit).
Thanks for letting me know about BOILR, ill check it out.. there probably is a limit to the amount of alarms, but it might be good.. Regardless thanks for the heads up, im working hard to find one..
Took alook too, appears not update recently.Have found Coin Alarm & Widget by Nextcoin on android playstore has percentages +- we are after.