The two storm types that come with the app are Roof Garden, giving you strong winds and heavy rain like in a summer storm, and Waterscape, a lighter rain falling into water, with thunder from farther away. There are six additional storm types and you can demo each one, but you'll have to pay 99 cents each to add new storms to your library.
A visually calming interface
To go with the great audio and visual elements, the app itself has a colorfully calming and intuitive interface. From the storm screen, which consists of a pause button and toggle for the flash (lightning), you can swipe to the right to get a list of thunderstorm types depending on your mood. The storm types are listed on the left, with storm descriptions on the right to set the scene. A swipe down brings up buttons for sharing the app, sending a message to support, and other common app options.
Part of what makes the sounds so realistic aside from the stereoscopic 3D audio, says developer Franz Bruckhoff, is that the nature sounds are from Emmy-award-winning nature sound recordist Gordon Hempton. I'm frankly not familiar with his work, but I can tell you all of the storms sound very realistic in Thunderspace.
One issue I noticed immediately is that you can't set a sleep timer. But Bruckhoff says the feature is coming soon and will be available in a future update.
While this niche app is likely not one you'll use on a daily basis, Thunderspace is great for a little relaxation in the dark with headphones, and the lightning that's timed to precede the thunderclaps makes for a great thunderstorm experience.