Lockwatch: download from google play:

https://play.google.com/store/apps/details?id=com.bloketech.lockwatch&hl=en&gl=US

Third Eye:

https://play.google.com/store/apps/details?id=appinventor.ai_rafhelp.The3rdEye&hl=en&gl=US

CrookCatcher

https://play.google.com/store/apps/details?id=com.harteg.crookcatcher&hl=en&gl=US