App from Playstore for checking online status of someone is cyberstalking

I want to know that using a 3rd party app like walastseen or whatseen for a short period once in a year will be considered illegal as per section 354D of ipc. These apps just automate and present the online presence of the target user in a table format. So is this legal or not? apps.apple.com/us/app/wlog-online/id1436496852 https://play.google.com/store/apps/details?id=com.walastseen.app I told about this to my friend and later that friend threatened me to tell it to the target user (another friend). Target user is the person on whome i ws checking if she is onpine or not. I do not intent to harm her nor say anything but when i told about this she got angered and told it is wrong. She forgave me but im worried from using such apps. I will refrain and never do it but still i want to know what happened is legal or not? Also foes it fall under cyberstalking as per sectiom 354D of ipc?