So, first thing to note is the difference between Top 10 in the free Medical category vs. Top 10 of all free apps. Not to talk down about their achievements, but the #1 Top Free Medical App doesn't even break the Top 200 Overall Top Free Apps.

My thoughts are if you are planning on adding ads eventually, you should ad them with version 1. Otherwise, people will complain when they come later.

We launched a free App (AppShopper) a couple of months ago, and we did hit the top 10 overall free.

We planned ahead with a dedicated server with a caching system (Squid) and the ability to spin up EC2 instances to mirror further. Fortunately, the one server (and the db server behind it) was able to handle the single traffic peak (which was over 100,000 downloads in a day).

I can identify with the testing thing (or lack thereof), as you can't fix a problem quickly, since you have to go through App approval. Which can be frustrating when there's a crashing bug.

You do have a good point about adding advertisements later on.

We thought that having advertisements at the very start might turn off some users - but there is also the possibility of a backlash if we add them later.

Note that we were not planning on adding a generic ad network, but rather partnering with a pharma company and deploying ads customized for the iPhone.

The other possibility is to have 'sponsored cases', similar to what they have on Medscape - there would just a be a single line of text, i.e 'Sponsored by XYZ"

>> So, first thing to note is the difference between Top 10 in the free Medical category vs. Top 10 of all free apps.

Fixed on blog. Can't edit post.

I have recently released a paid app - which has turned up in the top 10 sports section in the UK for both iPad and iPhone. I have designed this for the very latest version of the iOS - i'm guessing i'm losing sales doing this - have you or anyone else for that matter found any statistics around the numbers of users who download the app from previous versions of the iOS ?

Unfortunately Flurry's new SDK does not collect iOS version info, so we're as much in the dark as you are.

However, 90.9% of our users are listed as having iOS4 devices - I am not sure whether this indicates the iPhone 4, or whether iOS 4 prevents flurry from detecting the device type (in which case this would be an accurate estimate of the number of devices running iOS 4)

I guess that the percentage of users with iOS 3 devices should therefore be at most 9.1% - probably less than that.

Another statistic is that 7.43% of the users had jailbroken devices - I suppose that a significant portion of them would be using iOS 3, as it is so painful to upgrade to iOS 4.

The 'iOS4 devices' listing in Flurry means the operating system is running iOS 4 or greater. It doesn't mean the device is an iPhone 4.

Regarding the ios testing issues, would setting the iPhone emulator that comes with apple developer tools to the various versions have worked here?

The emulator doesn't contain older versions of iOS, and it should not be relied on for real testing. It links against different libraries, runs different code, and won't find issues with iPod music, sleep/wake, memory usage, multi-touch, case sensitivity, and more.

It's great for development and testing functionality, not good for testing compatibility.

Re: #2 ... I'm about to launch my first app and it will talk to a Rails app on Heroku.

Should I also keep a slicehost/linode vps running the app?

you can't afford $50/month even with a top 10 iPhone app? does not compute. if you're waiting to get your monies from apple, just email tim and i'm sure he'll let you pay on net 60 terms (or whatever apple's terms are)...

Our app is free. We do have plans to add advertising later on - but not for several months at least.

All costs are out of my pocket (and Sandaruwan's and Parinda's)

Note that $50 is a LOT when bootstrapping from Sri Lanka - my salary as a Doctor (which is much higher than that of the general population) was only $400 / month - with most of that getting burnt up in living costs.

I'm sorry if it's a dumb question but why do you plan to wait to add advertising? You are on the TOP10 right now, you are having good review (by users AND blogs). Its seems to me like the perfect moment to add ads to your product.

Arent you afraid that you loose your momentum without made any dollar from your app? You can find clean way to do advertising on an iphone app (look at Twitterific for example)

At the moment we have no way of knowing whether our users are health care professionals or not. We are releasing a new medical case each week(or more often), so that would keep the medical professionals from removing it - but others who are just downloading to checkout the app would get rid of it (that's our guess - we are still learning, trial and error). Advertising to medical professionals is much appealing than a general crowd.

Yes, we have several clean advertising plans. i.e - sponsored cases.

You're making a mistake. Apps have a fixed life-cycle. Once everyone who wants your app has your app (happens quicker with niche products), then it will start dropping in ranks.

Two of the apps in the top 10 paid medical are mine and a further one in the top 20 is mine. I know what I'm talking about. Free apps have a much accelerated life-cycle.

It's not "really" your problem or at least you can made somebody else pay for the mistake if your users arent really health care professionals. With your app and your actual ranking you could cold call a few medical magazines and offer to them to be feature in the app for a couple thousand bucks. Advertising in medical publication is VERY VERY VERY expensive, I'm sure some big co or medias have moneys to spare on ads in your app.

If you are not confortable with that maybe you could contact them offer them that to have an idea of what they are ready to pay to be in your app. Maybe the amount will change your mind :)

I dont mean to be disrespectful with my comment but I made that mistake to wait to long before monetising my startup because I always wanted more and more data before selling ads on it. I lost a lot of time (and money) for nothing.

Actually, that seems to be a good idea :) We should try to do it now.

Now that I think about it, another point that should have gone into the blog post is that "be prepared to monetize if your app goes viral in few days"

I'd recommend figuring out monetization earlier. It's never as easy as flipping on a switch. It takes a while to nail down your margins, pricing, ad networks, etc.

Sooner the better.