After Live Lock screen Beta, which hasn’t seen an update since long, Tetra Lockscreen is the second Lockscreen app from Microsoft. It is not available yet in other regions than US, but you can change your region to US and install it. You can do more on your Lockscreen with this app. You have four widget on your Lockscreen and you can tap on those widgets to display more info, all above the Lockscreen. Now, it has updated with minor changes.
Support for additional toast icons
Minor bug fixes