Mirrordrin is an app able to sync notifications between your devices.

Also available:
- Chrome extension https://chrome.google.com/webstore/detail/enkpeelnlglpanalilnbljhdgiilfkjo

Few tips:

- Clicking on a notification from Mirrordrin dismisses it from all your devices
- If uninstalling use the sign out button to avoid getting duplicates in your accounts
- You may need the "Android Wear" app installed in order to enable remote replying in some apps
- Specific support is currently in for WhatsApp Gmail Hangouts Facebook Messenger and Telegram. Generic support needs support by the app producing the notification. Apps supporting Android N's quick reply should work out of the box.

By using this app you agree to the TOS: http://dreamcode.it/mir-tos/