Put simply, Triggertrap Mobile is essentially an iPhone/iPad/iPod app that allows you to trigger your DSLR in a variety of different ways, much as you would use a Canon TC-80N3 remote to set the duration and so on when shooting timelapses.
The great thing about the app is that it allows you to trigger your camera a variety of different ways and not just based on a set interval. You can for example, trigger based on motion, distance, sound, vibration and more. The video introduction on their site explains it pretty well.
The App itself is available in the iTunes Store for around £7 ($9.99) but you do require a dongle and cable specific to your camera make/model in order for the app to work, both which retail at $9.99 each and $9 for delivery to the UK. I ordered the cables on the 7th and it took just over a week to arrive from Hong Kong.
I connected everything up and started tinkering with the app, which is well designed and is very clear/easy to use. You can be as specific in your control of the triggering as you wish, although for someone new to the concept, it may be a bit overwhelming with all the options. For me the level of customisation possible is great and one of the biggest selling points. At first, the app would not trigger the shutter on my Canon 5DMk2 and I disconnected the dongle and plugged it all in again before realising I had to slide the shutter option (so you can see the red indicator) along the bottom of the app before it started working. After that I tried triggering the shutter through the sound options and it triggered every time as I expected. To be honest, I was not expecting it to work so well but it did.
There is a Flickr pool for work created using the app which does not have much in it at present, presumably because the dongles/cables have only just started shipping, so hopefully once more people start receiving them we will see more examples of how the app is being used.
It would be great if the dongle/cable could be made smaller or you get the choice of lengths are there are times when I would have the trigger tied to the tripod or sometimes put away in the camera bag but that is me being picky. A total cost of £25 ($39) for the app and necessary cables, for me is very reasonable especially for the functionality I am getting in return. It is a very practical solution considering I always carry my phone with me so using it as the trigger is an added bonus.
I am in no way being sponsored by Triggertrap to write this post nor have been supplied with any products for free/review in return for this post. I heard about the product and chose to purchase it myself to see whether it will be useful for my needs. None of the links to the site/app store are affiliate links.