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Our progress in Android development in 2011: Part 1

April 25, 2012 at 10:01 pm | android, blog, general | 5 comments


Let us share what we did in 2011 in the Android development field. Not that it is extraordinary in any way, but it may be interesting for some folks out there working on side projects, for you to see an example of what you can get done in a year of evenings and weekends. We’ll write follow-up posts on the topics that you guys want to know more about. Let us know in the comments!

During 2011, we had over 1.6 million downloads of our applications. These new users, together with the existing ones, generated 24 million interaction sessions with our applications. We worked on six new projects, and launched four of them. Here’s an screenshot from our Flurry stats:

Flurry stats for Androidsx in 2011: 1.6 million new users, 24M sessions

Q1 2011

For our Spell Checker and Spell Checker PRO, we tried out different monetization alternatives, and also experimented with the prices. Every week or two (depending on how significant the amount of collected data was), we’d perform a single change, either in the price, or the way we link from the Free to the Pro versions, the name, etc. Then, we measure the relevant metrics (conversion rate, number of purchases, or number of new downloads, typically) to evaluate if the change was positive or not. We also implemented some user-requested features on the graphical user interface (e.g., character count, most-used actions always visible).

All this paid off, as the revenue doubled from the initial to the optimised configuration. For the free version, we’ve been consistently getting over 100 thousand new users per month. It’s quite impressive, considering how simple the application is, and how little time it takes from us now: it has run on auto-pilot for the better part of its life, almost two years now.

We collaborated with Luis Solano to launch an iPhone version for it, iSpellChecker. This version got some attention from the national media, but it didn’t gain a lot of traction.

Screenshot of iSpellChecker

Also, we did some minor enhancements on our TFLN widget, a widget based on our AnyRSS news reader that reads from the public RSS feed of the TFLN website. Our Admob and Mobclix ad campaigns were remarkably effective there, yielding pretty high eCPM (see our post on this: Admob vs Mobclix comparison). The TFLN site owners argued it was against their Terms of Service to have this application in the market, so we unpublished TFLN.

A couple of weeks before Saint Valentine’s day, we thought, would it be profitable to launch an event-specific application? For instance, a $1 application that provides a curated, categorized, collection of gift tips for Saint Valentine’s day. To answer this question, we thought we just had to go ahead and try. We decided two days is the maximum amount of time we’d put into it. Indeed, in a weekend we hacked out and published an application named Valentine Ideas. The conlusion? No, it’s not that easy. We only had 15 purchases. Well, it was fun, anyway.

Screenshot of our Saint Valentine's app

Q2 2011

Together with Juny Crespo, we started a new project, named Deals To Me. It is an Android application that provides coupons that are active near the user, filtering the results from several coupon providers. We hired Hugo Doménech to help us with the development of the client side. In this wiki space, you can find an early draft, the code of the running prototipe we built, and some more internal documentation.

Three months into the development, we decided to cancel the project. The niche of coupons had changed a lot since we first conceived the idea somewhere in mid 2010. The main reason behind this decision was, fundamentally, that we were late in the game, where many strong players were already so well positioned.

During those weeks, we had a idea based on a common use case of ours: we’re at some friend’s place, and want to show them the pictures from the trip last weekend. We thought, wouldn’t it be cool to just press a button in your phone, and then have the photos from my phone displayed in the computer in some way that’s comfortable to watch?

Two months of work after this, we published Remote Gallery 3D in the Android market, that targets this exact use case. During 2011, we had 230k downloads of the free version, and a bit over 1k purchases of the full-featured 3.95 USD Remote Gallery 3D+ version that we launched in the end of November. We were happy with the launch, and thrilled to get so many nice comments and high ratings from users, but still feel it could rank much higher on the Android market. There’s a lot of room for improvement there, especially in terms of marketing and positioning.

Remote Gallery 3D

To be continued …

This is a summary of what we got done in the first half of 2011. Within a couple of weeks, we’ll talk about the second half of the year, and share our thoughts on where we could’ve done better.

Would you want us to go into more detail in anything in particular? Let us know!


Can’t get our money out of Mobclix [Updated]

August 21, 2010 at 9:20 pm | android, blog, monetizing | 81 comments



September 12, 2013: Indeed, Mobclix scammed us. They didn’t pay us for almost a whole year now. We had most of our ad impressions directed to them for quite a while, so they have definitely made good profit off of us.

August 24, 2012: They just generated and executed the pending invoices. That was a quick reaction on their side! Still, we have not managed to match the figures of the monthly invoices with those on Mobclix’s Revenue tab (it would be great to know how exactly those are calculated).

Original post

This post is related with a comparison we did between Admob and Mobclix. Look at the Admob vs Mobclix: 1st round, 2nd round and 3rd round.

Find the updates below.

Will those numbers in your Mobclix analytics page ever turn into real money? Apparently it’s not so easy. And we are not the only ones, see here and here.

In short: we started generated revenue on March 2010 and now, in August 2010 and close to 5-figure numbers, we didn’t receive a single cent.

Long version: see our discussion with Mobclix support below.

Delayed payment

This is the e-mail that we sent on August 12 to Mobclix support:

During March, our first month with Mobclix, we generated $268.09 with our applications:

FML (803e8557-b71d-4937-b23a-8802ab22b125): $35.97
MLIA (cdf3868e-16b2-4611-ae83-4c6736400c50): $86.85
TFLN (cbc66b89-e88a-4e5e-8eb1-f3dbd36faf84): $145.27

Our questions are:
1) Why did we not receive any payment yet?
2) Why does the Invoice for June 2010 says $69.72? (Instead of $268.09)
3) Why didn’t we receive any payment yet? (We forgot this question in the original message)
These questions equally apply for the following month, April (whose invoice was generated during July)

The answer was just a document with the invoice for June (March’s revenue), splitting the contribution from every ad company. To this, we replied explaining what exactly were the mismatches between the figures in our Mobclix analytics and those in the invoice. In short, it should be 4 times bigger.

The answer was:

Mobclix will make payouts when we receive payments from ad networks. So while you may not be paid for a certain network in a month, we are working on collecting the payment and will remit it in your next invoice.

Irregularity in Revenue reporting

This is a different issue, and pretty worrying too. This was our ticket to Mobclix, on August 12:

In the Revenue tab for our applications, we noticed that, for 21-27 July, the generated revenue figures dropped a posteriori, after those days had passed. We can’’t find any reason or official explanation.

More specifically, here you have a table with the comparison of the figures that we observed before and after July 31:

27 July62.40$39.53$
26 July66.10$34.70$
25 July73.32$34.28$
24 July78.62$37.70$
23 July73.18$36.93$
24 July78.05$27.53$
23 July61.12$32.44$

We never got an answer.

What’s funny is that, if we hadn’t seen this, we would never have noticed. Maybe you think you made 100 dollars per day last month, but it has now magically to 40. No kidding.

Next steps

We still have hope that Mobclix will react, and understand how serious these issues are. We’ll keep you posted.


Admob vs Mobclix: 3rd round [Updated]

August 21, 2010 at 9:15 pm | android, blog, monetizing | 7 comments


This is the third part of a series of posts, look at the 1st round, 2nd round, and some related problems.

In our previous posts we didn’t cover a critical topic: how to cash out the revenue (ie, money) that you generate.


Every month you get paid the revenue you generated two months before. For instance, on July you get a transfer of the revenue you generated during May. As simple as that.


We started generated revenue on March 2010 and by now, end of August 2010, we have not seen a single dollar[1]. Ouch. That’s not a good business, is it?

This deserves a post on its own: Can’t get our money out of Mobclix.

[1] Update on August 24: We did get paid today.


Admob vs Mobclix: 2nd round

June 9, 2010 at 10:55 pm | android, blog, monetizing | 23 comments


This is the second part of a series of posts, look at the 1st round, 3rd round, and some related problems.

It’s been three months since we migrated to Mobclix from Admob, where we stayed for over two months. So we want to share some data, mainly focused to get our fellow developers starting out in the Android world to better estimate what kind of revenue they can make out of advertising.

We will compare the results for four weeks, aligned by the week day, using the data from February/March for Admob, and April/May for Mobclix.

This is the revenue that we generated per day (*):

And here, the revenue per click, which is our preferred indicator to compare how different ad providers perform:

All this has been generated by three applications, that currently have 100k active users (after over 200k downloads). It is difficult to keep track of how many users we had in each ad provider at every point in time, so comparing absolute numbers, like we did in the first graph, does not yield relevant conclusions.

In an upcoming article, we’ll show values that analyze the long term figures!

(*): We have multiplied all figures by a factor k € [0.2, 5.0], in order not to disclose our real numbers while providing meaningful data. This correction is consistent, i.e. if you have 2x active users, expect a similar price per click but double the revenue per day.


Admob vs Mobclix: 1st round

March 25, 2010 at 1:26 pm | android, blog, monetizing | 39 comments


This is the first part of a series of posts, look at the 2nd round, 3rd round, and some related problems.

We have been using Admob for three of our applications during two months. Our first impression was very positive: we generated way more revenue than what we expected.

The revenue per day was very unstable. In the last weeks, it went sharply down with no apparently reason (almost 30%-40%). We tried hard to understand how the Admob network works internally, with no happy end. We have more users, more impressions, more CTR but much less revenue… (stay tuned for an upcoming post where we share our stats).

After some twitter posts trying to find fellow developers with whom to share experiences, we were contacted by a Mobclix employee suggesting we switched to their mashup of agregated advertisement networks.

So, we tested Mobclix with the smallest app (in active users) with ads that we have, the MLIA widget:

Here it is the comparison between Admob vs Mobclix in MLIA over the same days, it looks really promising!

Admob stats

23-3-20103123 $0.50912.83%$2.93

Moblix stats

23-3-20103,313 $1.53892.69%$5.06

Still, it is very soon to draw firm conclusions. This is the start of a series of post with the comparative.



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