Aicoinpal.com offers several alert types.
Price reach alert : This alert notifies user when a price has felt down or rised to a given number by the user. For example user sets that notify me when BTC price drops to 7500$ then notify me.
Price % change alert : This alert is set by user. If a user inputs alert to notify user when a BTC pice rises by 5%, the user will receive a notification once the BTC price change will reach the inputed 5%.