The mobile apps business is maturing and while most of the media attention is still focussed on the latest app store success stories, developers are finding lots of better ways to make revenue with their apps. Considering all revenue sources, which categories of application are generating the most money and what’s the competition like on each platform?

John Cooper, founder of Pyxis Ventures, shares his personal experiences with promoting apps.

Using a Backend-as-a-Service (BaaS) can reduce development cost and time-to-market. It’s a simple way of getting a highly scalable backend solution without significant upfront investment. In a world where an app that hits the store top charts might gain more than a million new users before you complete your next iteration of development this is worthy of serious consideration.

Testing any mobile app presents a wide range of challenges. The often repeated but rarely followed software best practice of test early, test often is harder to adhere to than usual due to the fragmentation of the target environment and the relative maturity of tools. The increased acceptance of apps by mainstream consumers and intense competition have raised the bars for user experience and quality. There is more to test than ever, yet often very limited budget for doing so. Fortunately every challenge presents an opportunity and a vast array of tools vendors are racing to fill the gaps.

Usage Analytics tools help developers understand their users and the way they interact with their apps. Measuring app usage in this way and using the data to help target improvements to the app can significantly improve revenues. We asked developers to rate their primary analytics tool across a range of criteria. The results tell us which are developers’ first choice tools and how they compare.

Alexis Piperides, co-founder and CEO of Proto.io, takes us on a tour across the fascinating landscape of prototyping tools. In these early days of iterative design of mobile applications, can tools and services help to drive perfection?

The “write once, run anywhere” concept may be pure fantasy for most apps but sharing code across platforms is desirable and in some cases essential to making projects economically viable. With the application frameworks for all the biggest platforms being in different languages, the market for Cross-Platform Tools (CPTs) to enable code reuse is understandably the largest one (in terms of number of competing solutions) we track. The time required to evaluate all of them is far beyond what most developers can afford to spend on such research. So, which tools are the best?

When viewed as just another form of advertising, with a cost-per-action model, in theory Cross-Promotion Networks should work out fairly well for developers. User acquisition costs are predictable for advertisers and those displaying ads have reasonably good targeting built-in before any extra targeting logic used by the cross-promotion network – everyone viewing the ad has a smartphone and downloads apps on it! How does the theory work out in practice?

How do app developer revenues vary by country, or platform? Does the number of platforms make a difference to app revenues? Which models bring in the most revenues? We revisit Andreas Pappas’ November analysis of app monetisation with more insights from our Developer Economics 2013 survey across 3,400+ developers.

Of the tools and services for developers we asked about in our last survey, one category stands out by miles as having the wealthiest developers: voice services. Of course there’s a lot of variety in the voice services sector and the revenue is not at all evenly distributed.