Personal safety app

Hello all,
My sister is planning for her higher studies and for that she’ll have to travel long distance everyday. But our locality is not that safe. I’m worried about her safety. I found a safety app online and thought that it will add up safety for my sister when she’s alone. I would like to get suggestions from you all regarding this app. Does anyone have this app?? Will this really help my sister in case of any danger?? Any suggestions regarding this are greatly welcomed. I would install this app in my sister’s mobile on the basis of your suggestions. If you have any other suggestion, please let me know.

I think in case of emergency, you may not have time to pull out your phone, unlock it, open the app, click …

If for home safety, setup siren with door sensor would probably better, you can add a few more sensor to make it work better