Most of the time, when a notification pops up on my phone I can decide in a split second whether I need to deal with it immediately. But every once in a while I make the wrong call, swiping away an important alert that sends me digging through Gmail or Twitter to type out what should have been a quick response.
Android already has a built-in notification log, but accessing it is a little too complicated to be convenient for every day use.
The idea behind Unnotification is simple. Every time you dismiss a notification on Android you'll get a second alert asking if you want to undo that action. It also lets you blacklist other apps so you're not constantly bombarded with messages from Unnotification.
If that's still too much, an update to the app added the ability to remove those Unnotification entirely. Instead, you can pull down Android's Quick Settings menu to find an undo button for your latest dismissed notification.
The only catch is that Unnotification can't actually recall the original notification. Instead, it creates a barebones copy with the information you dismissed. So you can't interact directly with the new notification, but it will tell you what app it was from and relay the message.
Unnotification is also limited to devices running Android 8.0 Oreo or up, which means you probably won't be able to use it if you have an older phone.
But if you made the cut you can go ahead and download the app now so you'll never miss an important notification again.