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.

In ConvertKit, this is much easier. Unlike Aweber where you set up separate lists (I had 63 lists when I shut my account down), in ConvertKit, you don’t have lists at all. Instead, you use tags and automation rules to segment your audience. So I can have someone go through a nurture sequence (when they first join my list) while still sending my blog/podcast broadcasts to my main list. I simply create a rule:

Thanks again for another fine quality product. I have been a member of quite a few of your email lists and have purchased a lot of your products also. One thing I can say is they all are very thorough, informative and you over deliver. I have dealt with a lot of online marketers but there are very few like you who deliver such value and so quick to respond to e-mails. You are someone I know I can trust and that is very important in this business. Thanks again and hope to be able to meet you someday. - Rick Sorrels
I have applied much of my knowledge of digital and online marketing. But I also continue to stay busy learning new ways to make money online. Even as I’m writing this I’m also testing and tweaking three additional tactics. So the process is never finished and we grind on a daily basis. Each challenge is an opportunity to learn and improve for the next round.
Do most people open your emails on desktop or mobile? Email messages opened on a mobile device have nearly doubled over the past 5 years, while emails opened on an internet browser have dropped 26% in that same timeframe, according to a study from Return Path. If you find your list trending toward mobile, too, then aim for short email subject lines (35 characters or less). (Not sure how your audience reads your emails? Services like Litmus and Email on Acid can track which devices your subscribers are reading their emails on.)
Linking campaigns can also come in handy if you want to do things like nurture prospects into loyal customers. If you host a contest to raise awareness of your brand and supercharge your list growth, you’ll then need to tell them more about yourself. After your welcome series, try leading them into an educational series about your business and product offerings.
MailChimp does not allow content that references the terms “make money at home”, ‘get rich quick’, or other similar terms. These keywords overlap keywords used by ISPs and SpamCop organizations to block content associated with spammers from those industries. This generates too much risk for us to encounter automated spam filter blocks for all of our customers.
That’s it, and now you have successfully created your first Email list using MailChimp, and you are officially in the way of becoming an Email-marketer. The good thing about Mailchimp is; it’s design and every field is interactive, so even if you are new, you will never be lost. More over, you can always ping their support for any help, or search for tutorials like this to learn more. You can take advantage of any of these WordPress Email marketing plugins to quickly integrate MailChimp on your blog.

I have been on your list for some time now and I always pay special attention to your updates! The earnings potential you have given me is unbelievable. And I have recommended your products to some of my family members and they are now starting to see profits on their websites. (we are a family business!) I recommend this to anyone who is beginning in internet marketing. It is very simple to do. Every thing you need to know is already done for you. - Dave Osmonson
With a newly redesigned email editor, which makes it easy to pick back up on draft messages right where you left off or turn them into drip messages, AWeber is an email marketing app that does it all. If you need a professional email tool that’ll help you grow your lists and offer live phone support if you get stuck, it's a great email app to try. - Matthew Guay
One of the best features of AWeber is the ability to create a series of emails that are automatically sent out to new subscribers.  This allows you to create an eCourse or some sort of introductory guide for your latest subscribers.  This is fantastic as you can market it as an incentive for people to subscribe (e.g. subscribe and get our free 7 day eCourse) and once setup, you can leave it to be sent out automatically.

Since finding your great IM teachings and fantastic products I can honestly say my business has been taken to the next level. My lists are growing faster than I ever imagined possible! I now feel - no - I now know - I have a real online business – thanks to you I have access to fantastic products. Every week you seem to release a new product – which is great for me I will never be short of products to promote. I would like to thank you for this Golden opportunity - I totally believe if I can’t make money online now there is something seriously wrong with me! - David Knight
Let me say right out of the gate, that I would still recommend Aweber to business owners. It’s a great solution and is well regarded in the industry, particularly for their rigour of asking for the double opt-in to minimize spammers and assure permission (this is where a subscriber has to confirm via email that they do in fact want to receive information). It’s reasonably priced, and has many of the basic features needed to do good email marketing. MailChimp is comparable too – however, despite my love for their awesome branding, it lacks features that even Aweber has down. It’s great for a basic business owner.
One of the best features of AWeber is the ability to create a series of emails that are automatically sent out to new subscribers.  This allows you to create an eCourse or some sort of introductory guide for your latest subscribers.  This is fantastic as you can market it as an incentive for people to subscribe (e.g. subscribe and get our free 7 day eCourse) and once setup, you can leave it to be sent out automatically.
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