Since the arrival of iPhone 6s with 3D touch feature, many developers enhance their apps to use this feature and give their user base better user experience and use their iphone effectively.
1. Instagram
One of most popular social app out there. With 3D touch, you can preview actual photos inside the app, such as in the profile page of the user, not only from the app icon.
2. Pinterest
From the icon app, you can directly create new board. Inside the app, you can also use this feature. In first time use it inside the app, you'll feel little bit weird. When you want to pin or heart, you likely want to use 2 hands, one to activate the 3d touch menu and the other hand to choose option you want to take.
3. Dropbox
One of the 3d touch feature that we found useful when we use this app is fast upload option directly from the icon app. This is one of time-saving activities to use this app using 3d touch. Other option that you may found useful is to see recent files added to the app. Inside the app, you can preview photos, list of files within folder using this feature.
4. WeChat
If you using this app, you'll get some useful and time-saving feature using 3d touch. From the app icon, you can pull up QR code or mute the app for one hour if you get distracted with this app (One of the option that we'll often use)
5. Shazam
I really like with the options offered in this app. From the app icon, you can directly "shazam now" to know the music that you hear when you're in a hurry.
6. Hipstamatic
This app offer powerful options when you use 3d touch. You can directly shoot with several modes from the icon app. There are sunset, portrait and "blogger" mode. Give it a try !