The original Astropad app, which allows you to link an iPad with a Mac computer and use it as a graphics tablet, was launched back in February. Now its makers have launched a version for the iPhone, aptly called Astropad Mini. Like the iPad version, the new app allows you to use your Apple device as a graphics tablet when working with imaging applications such as Adobe Photoshop or Lightroom using Astropad's LIQUID technology for communication with the Mac. At 60fps, according to its makers, LIQUID allows for smoother operation than Apple's own AirPlay technology which offers only half the refresh rate.

The system also delivers image quality without compression artifacts and colors that are true to the source material. Alternatively, computer and phone can be linked via a USB cable. Unfortunately Windows machines are still not supported.

The system is compatible with a range of pressure sensitive styluses by brands such as Adonit, Wacom, Pogo or Hex3. Alternatively, you can use your fingers to pinch-zoom or edit on the iPhone screen. Apple Watch support is another new feature in Astropad Mini. You can use shortcuts, such as zooming or to undo an action, from the watch. The shortcuts are customizable, so you can assign your favorite functions. Astropad Mini can be downloaded from the Apple App Store now. At $5 it's cheaper than the iPad version and the Mac companion app, which at launch was $49, is now free of charge, making Astropad Mini a low-risk investment for those would like to try using their phone as a graphics tablet. More information is available on the Astropad website.