V-Planner 4+

Great bit of software, I use it on the PC and on the ipad. Level of detail is superb on the PC version but is more limited on the IOS version. This is especially noticeable in the configuration of the tools for dive planning. An example of this is setting different ascent speeds in the software once you reach your off gassing depth. On the iOS version there is only one speed available.

All in all the iOS version still provides a greater level of detail than other similar software when a computer is not available. It's easy to use (but RTFM first).
Safe diving, DiveBritain

As one previous reviewer already stated, the software is de facto standard but desperately needs one critical improvement: The slider for selecting numeric values is WAY too sensitive. Given that most of these numeric values are vitally important to the dive plan and any wrong entry could have potentially fatal consequences, this flaw is simply unacceptable. How about a different entry method, there are plenty of other applications doing it right (entry form, wheel, slider with varying sensitivity like in iTunes).
One more thing, it would be great to be able to transfer profiles and dive plans between desktop version and mobile version. Perhaps even via cloud syncing?

I use V-Planner on the PC and being available on the iPhone was a must have for me, it works much better now than in earlier versions and very easy to use when not near a computer. As mentioned in another review the ability to export by email or save would be very useful. The tools are also a great compliment to the app especially the best mix planner for nitrox or trimix. Overall, anyone looking to plan dives using the iPhone should definitely consider this software as this in my view is the most comprehensive and useful dive planning software available for a PDA.