This app works through facebook messenger, so it's suitable for everyone who always uses it on daily basis but not for me.
So, if anyone uses android or iPhone, yes it will work even though I haven't tried it on both devices.
I prefer to use a bot on telegram which can be set to notify every change in the price within minutes or if the price changes by any percentage such as 3% or 5% and so on. At current price (over $14,000) a 2% change means the price changes around $280 and it happens within few minutes (5-25 mins)