I am not signing up for an account so I don't know exactly how the API works, but if I were setting up an iPhone App to work with this, I would use the rails plugin. Rails gives you JSON communication for free (IE no extra work required) http://guides.rubyonrails.org/layouts_and_rendering.html see section 2.2.9. Then use on IOS app use something like: http://code.google.com/p/json-framework/ to interact with that.
So with these factors in mind, I had been staying put with Aweber because they met a number of these criteria. But I knew that I really wanted to up level my email marketing and put more customized sequences and automation into place so that the user experience could be much better, and I would have a clearer picture of my audience and what they want from me.
All the features of both AWeber and GetResponse have been discussed comprehensively in the above paragraphs, and you can find out yourself that there is no much difference between both the Email Marketing services. Both of these services are great in terms of service as well as features. Both of them have great features that can help you succeed in your Email Marketing campaign without having to waste your time. Overall, both of them are good for your Email Marketing campaigns, and you will be sure to achieve success by opting for either of them. 
As for reporting options, AWeber presents the standard raw numbers and percentages (clicks, opens, unsubscribes, and the like). It also includes more advanced data such as opens, clicks, and revenue over time; subscriber growth; and stats by location, area code, or designated market area. In addition, you can compare results across your past 20 emails. You can track subscribers based on their signup method, and the list segmentation options provide plenty of ways to optimize your email marketing. Reports are well laid out and easy to understand; much of the data is presented in both chart and table format.

Enter the autoresponder. The autoreposnder (or as ConvertKit calls it, a Course), is a series of messages that get sent in succession automatically. You write them once, determine the frequency, and then subscribers get these same messages no matter when they join your list. It’s a fabulous strategy because you build it once and then you can rest knowing that even if you can’t send something in real-time, they are still getting these carefully crafted emails.
Earlier this year, I made a big decision to move my email list of more than 135,000 subscribers to Infusionsoft from AWeber, which I’ve used for the past five-plus years. Three months later, my email list now lives on a relatively new and rapidly growing platform called ConvertKit. [Full Disclosure: I’m a compensated advisor and an affiliate for ConvertKit.]
For example, if a particular subscriber’s message number is 4, that means that that subscriber has already received follow-up emails 1,2 and 3. So if I have a 7 part follow up message sequence and I write a brand new followup email (message 8 in the sequence), there is no real way for me to prevent this subscriber from receiving message 8 unless I make his or her message number higher than 8. But if I do this, then that subscriber will never receive messages 4,5,6 or 7.
Before you can send AWesome emails with AWeber, you'll need someone to send it to. The easiest way to begin building your list is to import contacts that have opted-in to your email list, or gave you permission to send them emails. These could be subscribers you've emailed from another provider, or a list of contacts that you've built through your business.
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