I have managed to run JOD on an older iPhone4. It's not zippy enough on this 
platform to use as a development tool but I was surprised to see it run at all. 


Sent from my iPhone

On Jun 14, 2013, at 11:36 AM, "J. Patrick Harrington" <j...@astro.umd.edu> 
wrote:

>  I continue to be surprised by the ability
> of J on the iPhone to run rather substantial
> programs. I have a J version of a program to
> compute photoionization models of planetary
> nebulae. It has a main section of 500 lines
> or so and calls about 30 other verbs and data
> sets. One of these (2D grids of the collisional
> cooling by each of 16 ions) has dimensions of
> 55 250 16 4. The program integrates a system
> of 28 differential equations.
> Last night, expecting the worst, I loaded it
> into my iPhone (on my jailbroken iPhone 4S, I used the freeware "Fugu" to 
> make transfers from my MacBook Pro). And the thing runs! I do have
> to make use the unofficial "Insomnia.app" to
> keep the phone from going to sleep during the
> computations, which can take 10's of minutes.
> I'm just writing this to encourage others to
> explore the limits of J on your phone - you may be surprised.
> 
>                                Patrick
> ----------------------------------------------------------------------
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