Application opening

I'm sorry to hear about your issues with Snapchat. This issue has been reported multiple times this afternoon, it sounds like there is an issue with Snapchat. You should contact them for further support.

You might also find the following article helpful:

If an app on your iPhone or iPad stops responding, closes unexpectedly or won’t open – Apple Support

If it happens using Snapchat only, contact their support team explaining your problem.

Regards

Giulio

From this site regarding Snapchat→https://downdetector.com/status/snapchat/