Apple's 3D Touch technology may be young, but it's already got app developers thinking outside of the box. If you want to use your iPhone 6s as a digital scale, Steady Square is for you. Oh, it's also a game you can play.
Steady Square, developed by Asaf Avidan Antonir, is a simple app that makes use of the iPhone 6s and iPhone 6s Plus 3D Touch features. With a little basic maths, the app can be used as a scale for weighing anything you like. Other developers have tried to make a similar app already, but Apple doesn't currently allow scale apps in the iOS App Store. Antonir's clever workaround allowed his app to be accepted, and it's a neat way to weigh mail, ingredients for cooking, and other small things. You can download the app for free at the link below, but it does require a 3D Touch capable device.
If you want to weigh things with the app, head to Training mode. As you push on the screen you'll see a number between 0 and 1000 appear, depending on how hard you press (the harder you push the higher the number). Start by weighing the spoon or holder first and recording its force number. Then add whatever you want to weigh to the spoon. Subtract the spoon's force number from the new force number, then divide that by 1000 (to get the new ratio), and finally, multiply it by 385 (the maximum force — in grams — that can be recorded by 3D Touch). You should end up with your item's mass in grams.
Steady Square [iOS App Store]