Poirrot is a straightforward tool to aid people with OCD (Obsessive Compulsive Disorder), or anyone else who needs to convince themselves that they locked their front door. You can use it by yourself, or you can create a shared bucket with your trusted people, and then either you or they can take photos when they're checking something that the others can see. These photos live in the app and are deleted automatically after a period of time, saving you from filling up your phone with photos of handles. All data is stored using your iCloud accounts and you can configure the expiration timer for each shared bucket.

The person creating a check session can take photos that the others see, and the viewers can request retakes if they're not satisfied with specific photos. Viewers are notified when a new check session starts.

It's simple to get going and this app is family-sharing enabled, so you only need one purchase for your whole family in iCloud.