Category Archives: UI/UX

Designing “Killer” Mobile Apps: A prototype story

Designing “Killer” Mobile Apps: A prototype story
By :Alecsandru Grigoriu

The event lasted two days: the first was packed with presentations (#web, #design, #mobile, #gaming, #performance, #opensource, #community, #art), while the second represented the workshop itself.

For this season’s edition, we decided to go on a different, funny and “wtf” approach: challenging ourselves just like the participants and design a mobile application for contracting “hitmen”. To keep it “legit”, there is no killing involved. Our dystopian vision involved only to taunt, steal intel and sabotage. We called it: HITS.

Mobile app logo design for the prototype application Hits.

The brainstorm

First of all we started laying down our ideas on paper. It didn’t matter if they were right or wrong, absurd or pure genius, we knew we are going to do something unique so we tried to fill in all the gaps.

Mobile app design ideas for the application Hits written on paper.

The flow

Of course we couldn’t have left the whole idea of the project just on paper full of scribbles and doodles. We centralized them and linked them in a more visually appealing way. We used simple shapes (rectangles, circles, squares) to pin point the main interactions and controls.

Mobile app flow with user experience interactions included.

The actual flow goes something like this: You enter your credentials, then validate your existence using a retina scan. Once you login you view the current missions you started. From here you can view the current progress (and location) of the Hitman (each mission has a list of milestones to be checked). Or you can start a new hit depending on what you want: taunt, steal intel or sabotage. After you select the type you view the list of hitmen available for the mission. After you choose the one you prefer, you are forwarded to a form where you send the offer. Here the negotiating part begins – you need to choose which budget, how “loud” the hit should be etc.

As a final touch thinking that this app needs a certain level of “intimacy” when you receive the final call from the contractor to confirm the hit… you get a masked message from “HunnyBunny” stating: “Dear, do you want some milk for tomorrow morning?” (Yes/No).

The sketches

Next up we detailed each screen on sketches. Here at Grapefruit we use gray markers, highlighters, thin liners and small black markers. We believe that the gray marker is a UX Designer’s best friend. We sketch a lot because it allows us to make mistakes and recover fast and most of all you don’t have to be artist extraordinaire.

Mobile app design sketches with colours and various details.

Testing the sketches

With the sketches drawn we went out and tested them internally. It may look naive, but it’s a very fast, efficient and cheap method to validate the layout, the controls, the interaction and behavior of our ideas.

Mobile app design sketches testing and proof of concept.

The visuals

Without further delays we started working in the visual language for the application. This included colors, fonts, controls, bars, buttons, animations, patterns and of course errors. We recommend to design even the worst case scenarios. For example, if a title is too long, will I trim it and add “…” at the end or will I organize it into two rows? The same goes for errors and how the user will recover from them.

Mobile app design style guide with colours, interactions, buttons, images and various icons.

The mockups validated with Skala Preview

The visuals helped us a lot to gain time and finalize the mockups. It was a matter of applying the visual style to the sketches. Moreover we used Skala Preview to get the designs synced on our devices to validate the whole layout. Every time we saved a PSD file, the screen updated itself on the device.

Mobile app design welcome screen and login page.
Mobile app design mission screen with details, map and tasks.
Mobile app design screen to setup the details for an assasin job with slide and button to complete the offer.
Mobile app design screen with assassin status and slide left menu.
Mobile app design notification screen with the final go of the assassination mission.

Testing the mockups

Once again, with the screens intact we printed and tested them internally. We wanted to make sure that the app looked, felt and behaved just like we need it.

Mobile app design mock-up with colors on paper and life size images for better interaction.

Updating the Flow

With the mockups finalized, we mapped the new screens and updated the flow. We used gesture icons to highlight and document the final behavior of the app.

Mobile app design flow with detailed interactions and color screens.


We didn’t stop here and we ran the app through several prototyping tools. Our first pick and one of our favorite and requiring options is Invision because of its simplicity and collaborative use. You can play with the prototype at

Mobile app design prototype in Invision. Interaction buttons and areas are highlighted.

We also experimented around with Marvel to test out their library of animations and transitions. It’s similar with Invision, but it lacks several key features – no collaboration on this one. You can check our prototype on

Mobile app design prototype in Marvel with transition and actions screen.

Our biggest surprise was Pixate. It allows you to add conditional complex animations. Think of Tinder shuffle cards or Path-like menus.

Its only downside stands in the lack of educational materials. Yes, there are some tutorials available, but sometimes you need more than a few videos if you want to grow a proper user base. Nonetheless… it’s cool. If you have Pixate installed on your phone… go check our demo at

Mobile app design interactions using Pixate. Screenshot of screen while setting up an animation.

The Workshop

The first day of the event was a full-house fiesta of interesting and diverse presentations. It sparked the attention and curiosity of the participants and each talk managed to distinguished itself one from another.

The following day, the marathon started with the challenge to pick a random feeling (anger, happiness etc.) and design a concept that will make the user live that certain feeling. The contestants put a lot of effort into finding the right idea. Afterwards they started sketching on paper certain concepts and finally mixed them all into Photoshop mockups.

Surprisingly (in a good way) all those who wanted to present a working demo chose inVision as their main prototyping tools. Personally I was a bit disappointed that all of them went for a mobile application solution rather than thinking outside the box like wearables, projections, holograms etc. It would have been interesting to see such solutions. Maybe I’m just a bit pretentious. After all most of them were High Schoolers.


To conclude this experience, we had lots of fun being part of the event and we will continue to be involved in our local design/IT community.

The Future of User Interfaces

by Sven Lenaerts24

We are web designers and developers. As obvious as our work is (we build interactive media applications) there’s a deeper meaning to what we do. We analyze design problems and explore different concepts to solve them. This also means that we think of the communication between a device and the user. We develop that communication. We design what the user sees and does.

You are setting the stage for other people to perform. But you can never tell them what to do.

Designed by Timothy Reynolds

So, why are we exploring the future of interfaces? Simply, because we develop them. As media changes and evolves, so should we. It’s worth your time to see what the future might look like, as it will change the way we work and the products we deliver.

Let me give you a concrete example. Ten years ago, nobody had a clue that responsive design would become such an important key issue for our industry. Even to this day, there are still new websites being developed which aren’t responsive or have any kind of mobile contingency.

For a long time, we’ve been using a traditional way of working with media. We have a desk, a computer and the keyboard and mouse as input-devices. We have accepted that the internet is an essential part of our lives and it has become nearly impossible to completely disconnect, even if we would like to.

Mobile first on Dribbble

However, there’s a large shift going on at the moment. There’s a shift from desktop to mobile devices (and even beyond) and it forces designers to refocus. For most of us, this is an obvious evolution which is going on, but, it changes how we designers should look at the systems we develop.

In the past, in general we had a lot of control over our designs. There is a task and there is a consequence. Web design has become far more complex and it has become important to guide a user through one flow to optimize their user experience. We have to think of behavior patterns, desired outcomes and potential mistakes the user can make. We’re no longer developing a static experience, rather, we’re creating living, interacting systems.

Users’ behavior online also has changed incredibly. Google, for example, has divided their users in three main categories:

  1. The repetitive user: someone checking the same piece of information over and over again, such as e-mail or stock prices.
  2. The bored user: someone who has time to kill.
  3. The urgent user: a user with a request to find something specific and fast.

Your online habits make you a repetitive user on certain websites. Social media websites are great examples of this. The games you play online, or the news websites you check sometimes, are a result of you being a bored user. For example, when I’m bored and not feeling very productive, I like to spend time on Reddit. Finally, the urgent user is the target audience we often develop websites for during client work. They want information and they want it fast, such as the price of a product, a service they’re specifically looking for, or the closest location of something they need now. The key issue? Users want to achieve their goal now (or at least as quickly as possible).

For designing the best user experience, it’s always a good idea to keep these principles in mind. You should be able to tailor your website to make repetitive (predictable), bored and fast use as integrated as possible.

We are a little bit confused of what’s really important in life

It’s amazing how mobile has became engrained in our lifestyle. Particularly since the arrival of notifications, we’re constantly refocusing our attention. The best concrete example I’m able to give is in conversations with friends. If you receive a notification or text message while having a conversation with your friends, the chances are quite high that you’ll peek at your mobile device.

We have to be aware of the consequences of the products we designers put in the world, as they can change behavior of people. Users’ divided attention can be enabling as well as disruptive. This is why the flow between an interactive screen and our real life should be as natural and accessible as possible. Users should comprehend interfaces in a glance.

Digital natives expect that their favorite digital content follows them seamlessly through the world.

One interesting evolution is in the power of the multiplatform experience. Instead of products being accessible on one specific device and platform, slowly, everything is designed to have a fluid experience so you can recognize the same experience on multiple platforms. Saying that, it’s important to understand that each device and platform has its own strengths and weaknesses.

A great example is how Twitter translate the web experience to a mobile experience, and make both platforms successful by using the platform specific strengths to improve the features of their product.

Another strong evolution which has become very obvious in recent years is the rise of comfortable computing, with tablets being the perfect example of how our usage environment has changed. It’s become more than simply being about getting tasks done.

As designers, this means that we have to focus on the real human needs, instead of focusing on our regular design patterns.

What does the future hold? I can’t possibly know, but we can speculate..

The graphical user interface isn’t exactly the future, rather it’s a current way of designing interfaces. The idea of graphical user interfaces is that you complete visual tasks to receive results, such as clicking on a link to open a new page.

Calendar Screen on Dribbble (used also as article thumbnail)

We guide our users through metaphors (such as the shopping cart icon) and standards we use in web design. Nothing new here.

The natural user interface is the current evolution we’re facing. It’s already used today, though to a lesser degree and it isn’t really being used in the standard web environment. It’s only a matter of time before the integration of natural interaction will become more prominent.

Touch UI on Dribbble

Natural user interfaces focus more on doing. Users interact with the device or platform to achieve results, ideally enjoying the actual interaction as much as the accomplishment itself. The interaction feels fluid, direct and organic. Gestures especially (tools such as the Leap Motion can play an important role in this) are important assets in natural user interfaces.

Existing examples include websites which have the functionality you can swipe (on tablets for example) to navigate through a gallery slider.

For quite some time, there’s been reference to Minority Report and Iron Man for an example on how the future of interfaces could be. The prospect excites people. The problem with these ideas is that much is focused on interface eye candy, rather than that we actually try to design more intuitive and effective ways of interface design. It shouldn’t just look good, it should work as well as it looks.

Mailbox is a great example of a recent natural user interface!

Content comes first, navigation comes second.

A key element in natural user interface design is direct manipulation. Users love to have the feeling that they’re directly engaging with a screen (use of gestures).

Another key element is that content becomes a major part of the interface. This concept already exists, such as your albums in iTunes or your books in iBooks. Our interfaces become a general framework users see their preferred content in. Content will become more aimed at the specific needs of the user. This is already happening, the best example being social media. My news feed on Facebook is obviously completely different than yours as I’m receiving content based on my preferences (my friends, in this case). This concept means that we’re trying to decrease the amount of navigation tremendously by providing the correct content in the first place, so that navigation is required as little as possible.

Provide immediate value whenever you open a website or application.

While we’re still slowly moving from graphical user interfaces to natural user interfaces, a third spectacular evolution is on its way. Although it may take a while before we see and use it, it’s closer than might seem at first sight. An organic user interface means that we manipulate the actual physical shape or position of a device to control it.


I’m referring in this case to bendable screens, and although this technology is very much in its infancy, it offers so many incredible opportunities to interact and navigate through devices.

Naturally, an organic user interface offers way more possibilities for input (and even output) than the previous interface concepts. At the moment we’re used to point and click, though we’re getting more involved with gestures, touch and (thanks to gyroscopes in devices) tilting and rotating, although it’s still limited on the web. Eventually, we’ll be bending, deforming and manipulating actual physical objects.

If you’re interested in these kind of projects, the Human Media Lab has quite a collection.

We can conclude that these are exciting times for us as web designers. Our function appears to be shifting more towards the job of interface designers and information architects. With devices and their interfaces changing, so too will websites and their functionality.

How do you see the future? How will our role change? What new technology will we adapt? Although much can be questioned at the moment, one thing is for sure: we’ll be stepping away from the classic job of web designer as we know it today.