As an iPhone app developer in Amsterdam DTT has already developed many iPhone apps for small and medium-sized enterprises, individuals and governmental organisations. We are an ambitious, fast-growing company with a professional approach to each project, with strict principles and effective client-oriented policy. Customer satisfaction is of paramount importance for us - we are flexible, open for innovations and ready for new challenges. DTT has developed apps for iPhones of various complexities and functionalities, from news apps to complex solutions with Augmented Reality.
iPhones are some of the flagship devices on the market. Because of this high competition defines the app store. That's where quality and design matter if you want to stand out! Check the DTT portfolio to see our excellent examples of apps which top the app stores and get very high users' rating. For more information about how we can serve you and your business in the best way, please don't hesitate to contact us.
Want to know how we can take your project forward?
Are you searching for a suitable partner to develop your iPhone app? Then you are at the right place. No challenge is too big for us and the motivated team of DTT knows exactly how to make sure your idea develops into a unique app of high quality for iOS. We make this possible by creating the right combination of technique, strategy and creativity to your idea. DTT is known as a reliable, flexible and fast app developer with an eye for results and quality.
Two iPhone apps from previous collaborations:
King Penguin Greenpeace app Greenpeace was looking for an app developer to get more reach and attention for their campaign ‘Protect the Antarctic Ocean’. They found the right partner in DTT to develop a creative app for their campaign. In a relatively short period of time the King Penguin Greenpeace app was developed.
Users of the app can look for penguins via augmented reality. A variation of the popular Pokémon GO app, but penguins instead of Pokémon. The app has been released recently and well-known Dutch media such as the tv program Koffietijd from the channel RTL4 and the radio channel BNR already talked about the King Penguin Greenpeace app.
RIVM Tick bite awareness app The Dutch National Institute for Public Health and the Environment (RIVM) was looking for an app developer to develop and to inform users about ticks and Lyme disease. They went to different app developers and decided DTT would be the best partner for their project. According to RIVM, our dedication during the first meeting and our rates were definitive reasons for their decision to partner up with DTT.
The result of this collaboration is the RIVM Tick bite awareness app. The app has different functionalities, for example a tick-radar, in which users can easily see if there are ticks in their area. There are also video instructions for checking, removing and treating ticks in the correct way. We are proud of the result, a week after the completion of the RIVM Tick bite awareness app, it was number 1 in the category of healthcare in the App Store. Next to this, well known Dutch media such as the news channel NOS and the magazine Margriet wrote about the app.
Testimonials from our clients
Ministry of Health, Welfare and Sport
Marlies P. Schijven, CMIO Ministry of Health, Welfare and Sport
''DTT has built the 'ziekenhuisbedchecker' for the ministry of Health, Welfare and Sport, with which we can give every healthcare provider free insight into the available beds, IC and non-IC, COVID-19 and non-COVID-19 in the Netherlands from existing registration systems. The ziekenhuisbedchecker has recently been expanded, so that the availability at the emergency department is now also visible.
This is going to help us enormously even after the corona crisis. After all, ambulance services know whether they should drive to a hospital or not, and GPs can see if there is a bed available at the emergency room before they have to make rounds if they want to send in a patient. DTT has really done this in record time, I am very impressed by the commitment and thinking along in turbulent times. Very professional, well-coordinated party. Definitely the right choice!''
‘’DTT has built an application for us, with which we can digitally replicate and decorate every Randstad location in the world. This will help us tremendously during the worldwide spread of our new positioning Human Forward. Furniture, wall decorations, floors and other elements can be placed into the location with the tool. Simultaneously, a calculation is being made of the coinciding investment.
We have gotten to know DTT as very professional, creative, correct and extraordinarily fun.’’
''Litter is a major annoyance for a lot of people.'' At the elementary school of the municipality of Hollands Kroon, children from group 6 had the solution. A game-app should contribute to the reduction of litter.
We came to DTT with a reasonably well-developed idea. The idea was received with great enthusiasm. The game is intended to make young people aware of the litter problem.
DTT pleasantly surprised us with the development of this app, Operatie Z.U.I.V.E.R. The game, like Pokémon GO, can be played with Augmented Reality in the public space. The game is instructive, you can play alone, but also with groups against each other. In the app you can add schools and sports clubs to compete with each other. We think it can make a major contribution to the awareness of litter among the youth. DTT has helped us enormously with the development of the app. They think along creatively, come up with solutions and are ready to answer our questions. Together we have expressed our intention to develop the app further.''
"Speaking for both myself, Joost and the entire projecteam, I would like to thank DTT deeply for your efforts. We are thrilled with the end result!
When we approached you with the request to make penguins appear everywhere in the Netherlands through AR, we received an exceptional proposal. A very entertaining elaboration of our campaign to make the South Pole a protected marine reserve. Together we quickly came up with the name for the King Penguin app and fun occasions to use the app so everyone can search virtual penguins via AR in their own neighborhood. By combining this quest with information about the animals and their threatened environment at the South Pole, awareness is created in a playful way. And that's exactly what we wanted. Once again, compliments on how fast you brought this amazing app into the digital world. I experienced it as a very pleasant collaboration."
''Since the beginning of 2021, Dutch Media Literacy Network has entered a collaboration with DTT for the serious game MediaMasters. In a very short time (6 months), DTT has developed a completely new version of MediaMasters including a teacher portal, Content Management System (CMS), website and the game environment itself. They have done this very skilfully with an eye for detail and planning. DTT is an agency that can think along with you about what is necessary, acts adequately and is very reliable. They also offer good service on the solution and have a high response speed if assistance is needed. We are therefore very satisfied with this collaboration.''
Check our project for Dutch Media Literacy Network: MediaMasters
Real-Time Road Inspection
Andries Takke, director Takke Breukelen B.V.
''A safer Dutch road network, that's what I longed for about eight years ago when the first idea for Real-Time Road Inspection (RTRI) popped into my head. For my work at Takke-Breukelen B.V. we are on the road a lot. While driving, you see many deviations in the infrastructure, such as holes in the road or traffic signs that are placed incorrectly. Surely there should be a simple way for this information to reach companies who can do something with it?
Once the idea was born, DTT was able to convert it into the RTRI app, which delivers real-time images of the current state of roads and public spaces and sends them to an online platform that companies can join. A useful app for any company that has anything to do with public space. This is because it allows for the quick resolution of infrastructure anomalies. Users also have the option of flagging images when deviations are noticed on the road, for example when there is damage to the road surface.
We at RTRI are extremely satisfied with the app developed by DTT. Everything has been thought of. Faces and license plates that are loaded into the app, for instance, are blurred by means of Artificial Intelligence. In this way the privacy of everyone is guaranteed, while the app can do its work. DTT has also ensured that new data automatically replaces outdated data. Moreover, a very complex caching mechanism was used, because a lot of data will be loaded into the app (over time). A fine piece of work, in which we have experienced a very pleasant cooperation.''
“We have come to know DTT as a great club to work with, a proactive attitude and thinking along with the client are of paramount importance. At the start of the collaboration, we deepened strategy and concept with DTT, followed by the delivery of a creative strong design with strong gamification elements. Furthermore, their organizational strength and process-oriented approach ensured that we moved smoothly and steadily towards a nice final delivery.”
Ernst Bohlmeijer, Professor of mental health promotion
''DTT has built two Progressive Web Apps for us for our positive psychological training of self-compassion and gratitude. With the beautiful designs we have been able to test the effectiveness of our training courses in scientific research.
I have experienced DTT as a pleasant organization to work with in the development of our apps. They are good at thinking along and always adhere perfectly to the agreements. In addition, they respond adequately when necessary. I was happy with the result.”
"The Canteen Scan, an online tool that helps providers to make their eating and drinking facilities healthier, was ready for an update. We have put a 'dream scan' on paper with all our wishes and those of our users. Together with DTT, we translated it into a design, which was then built.
With multiple user roles, different needs per environment where food and drinks are available (school, sports, work) and the link with an existing food database, the Canteen Scan is not a simple tool. But DTT has succeeded in translating our wishes into a nice tool. The new Canteen Scan is a visually modern, adopted and user-friendly web app.
Those involved in canteens and restaurants can enter the products offered and their placement on the basis of photos. Users additionally receive advice for improvement, so that locations are able to take steps towards a healthier eating environment that stimulates consumers to make healthier choices."
Check our project for the Netherlands Nutrition Centre: Canteen Scan
Dutch Noorderkwartier Water Board
Marieke Duijn, Communication advisor
"We wanted to develop an online game that would make people more familiar with the work of the water board and what residents can do themselves for clean surface water. With facts about water so that it is not only fun, but you can also learn something while you’re playing the game. DTT has helped us a lot in the search for what eventually became the HHNK Clean Water game. A fun competitive and informative game. The creative and approachable employees of DTT and their quick actions during the development process have positively surprised us!"
“The DTT design team has helped us a lot to update the website, to get more conversions and to improve it technically. The same with our MultiBel app. The challenge was the combination of a modern design with improved user-friendliness. We are very satisfied with the result and this certainly makes you want more. Dealing with the team was pleasant, from the big boss to the individual designers, all professionals. SEE YOU SOON.''
Stephanie Leyenaar, Director Foundation de Juiste Schakel
“We let DTT develop our website and app and I am incredibly pleased. Close communication, genuine interest in our foundation and we are only receiving positive feedback from our users. We would absolutely recommend DTT to anyone who wants to develop something. The employees get an A+ from us.”
Pieter Rüpp, Co-founder SportWallet and Maurits Rüpp, Co-founder SportWallet
“With an idea in our heads we ended up at DTT. The initial communication went smooth and before we knew it, we had a meeting at their office. After a few brainstorming sessions we immediately went into the design and development phase and the results speak for themselves! It's extraordinary how DTT’s team managed to convert the idea in our heads into an actual app. Thanks to the experience and expertise of DTT are we able to control and manage the CMS of the app very easily and in an efficient way. Our decision to collaborate DTT has been the correct one and I would recommend them to everyone.”
Marco van Hagen, advisor entrepreneur support and Gabriëlle Hoogendoorn, productmanager
"Very recognizable, the description from other organisations about the collaboration with the DTT team.
DTT supported our team during the development of the game concept to a fun and informative app, with which entrepreneurs can learn more about importing in a fun manner. By playing the import missions users will receive direct feedback of their own knowledge level. Via the attained score and ranking, they will challenge their friends to a competition.
DTT created a whole game in a short time. Short communication lines. Clear in expectation management. A lot of patience with our search for the maximum attainability within the proposition. Proficient in the translation of wishes and demands to a practicle solution."
"DTT has helped us twice. First, DTT devised a prototype for an app and when this was well received, they made a fully dynamic version of the app. Our needs and requirements were not easy to fulfill, but during the pleasant co-operation we have come to a good design that satisfied both parties. In the implementation phase DTT came up with good proposals for the app, but also gave us good advice on how we could position our app within the organization. It is amazing how our complex scoring model was so easily implemented, so our non-technical colleagues can manage this through the back end."
"We wanted to create an additional training environment for medical students. On the basis of realistic medical cases, they can learn how to interpret heart and lung sounds. In collaboration with DTT we have developed Clinical Challenge app, so students can easily practice their knowledge.
DTT was a reliable partner; employees think along with you, quickly answer questions and provide quality results. Through a good rating system with highscores and attractive animations with sounds, it resulted in a good app. Students are excited about e-learning and are more eager to learn."
Ad van Luijt, chairman of the Build@School Foundation
"Since 2015 we are playing a construction game at schools to encourage students to choose for construction technology. This game in which a Lego house has to be built, was supervised by a few game leaders. As it was becoming a problem to find enough game leaders every time, the decision was made to change the game into a digital construction game.
This is how I came in contact with DTT in Amsterdam. After meeting with Jeffrey and his organization, we decided to let DTT build the game.
This has been done to great satisfaction of our Foundation "Build@School". The employees of DTT were always there to process questions and suggestions that we had. The game is being played for a year now and we intend to expand the game further. Of course we would like to do this again with the cooperation of DTT."
"For our most popular and best-known lottery scratch-card, December Calendar, we came up with the idea to develop a fun game that you can be played both on PC and on your phone. For this, we started looking for a multimedia partner and found DTT. Despite the short timetable, DTT delivered a super game: the December Calendar game. This game, starring the penguins from the December Calendar 2014 lottery scratchcards, is based on an existing game and is intended as a free fun bonus. You can't win (money) prizes, but you can get the highest score! Communication was smooth, clear and fast and we could always turn to DTT if we had questions. DTT also thought actively us on how we could generate more downloads and gave us good advice where necessary. In short, DTT has been an excellent partner. We will certainly continue working with DTT in future."
Desirée Beaujean, Head of Development and Implementation Department
"The RIVM (National Institute for Public Health and Environment) had the "Tick bite" app launched in April 2014. This app was initially developed for Android. With this app people can check what ticks are and how to correctly remove them (even without internet connection!). Starting from July 2014 the app will be available for iOS also.
In the beginning we have spoken with a number of potential executors and we chose for DTT. What struck us was that from the very start DTT was very involved in the issue and the development of the app. The rates were reasonable and certainly played a role in choosing DTT. During our collaboration, we got to know Jeffrey and Dirk better. We emailed and called each other so often, we even noticed the urge to contact them when it wasn't even necessary. I think that says enough!
In short, DTT has been a great partner to develop an app. They are reliable and always up for a joke. Great job!"
Safety on and around the construction site is an important issue for BAM Utiliteitsbouw and Royal BAM Group. To emphasize this, BAM Utiliteitsbouw has introduced the "BAM builds safe" web app. In co-operation with DTT the web-app was worked on with enthusiasm and realised in a short amount of time. The design and the development of the web-app was a urgent order. DTT has delivered a complete and fully operating solution. Our compliments to DTT and their proactive and flexible approach.
Rian van der Broek, Deputy Chief Information Officer
We are very satisfied with the iStrategy app that DTT has developed for the Ministry of HWS. During our collaboration with DTT, we were pleased by their active thinking along, professional advice and their quick clear communication. Points as working with multiple parties, time pressure, and last minute changes changes weren't a problem for DTT.
"DTT has really done a great job by developing the first KNHS Dressage and riding tests app for iOS and Android. Despite the short development time (and thus high pressure on the project) DTT has taken the usability of the app into account and has given clear advice on functionality and design. Thanks to the pleasant and efficient co-operation, the app could be launched on schedule and within budget. This was well noticed: the app reached the number 1 position in the category 'best paid' in iTunes. The team of DTT is commited, enthusiastic, works fast and communicates clearly. An absolute must!"
Johan G. Gelderblom, Director Finance, Administrative Organisation and Information Technology
"We were looking for a specialist, that could guarantee speed, transparency and quality of service and product and think along with the client! DTT has managed well to deliver the first project, a sales app for our international branches.
We decided to give our second project, a web portal for our international customers, to DTT as well. I am curious whether DTT will manage to succeed here. After all, as they say "You're only as good as your last game", so you have to prove yourself over and over again!
Project 3 (a second Sales app) and project 4 (a complete new website) are still on the drawing board, so .......!? "
‘’DTT has helped us tremendously with shaping our (many) wishes and ideas to a supportive web-app for all our tender processes. Shaping legal requirements to a ‘simple’ and user-friendly tool for our buyers has definitely been a challenge. DTT has fulfilled this challenge extremely well. We are very pleased with the end result! DTT is definitely a recommendation to work with. They are open and transparent and very good in carrying out a concrete idea.’’
"Together with DTT we have developed a native iOS and Android app for our b2b customers. With this app they can respond to assignments that individuals have placed on our Kluscontact.nl platform. We developed an API ourselves that communicates with the app.
At DTT they always fulfil their promises. Beforehand they clearly informed and advised us about various options related to native or non-native app. They also took into consideration all interactions and potential complexities that come with these options. The app is now live and our customers are very satisfied with it."
Dennis van der Stoop, Head of Construction Management
DTT has developed several apps for NSI that saves time and paper for administrative work. The needed documentation is reported and communicated directly to the customer. The rapid approach and continuous thinking along in the process made it easy to work with DTT.
DTT has developed the first Valtifest app for us. Public surveys show that visitors of the festival had given a very high rating to this app. The project management during the app development was on a professional level. A pleasant co-operation with a wonderful product.
"DTT has developed apps for Aslan Music Center that teaches students to make music. DTT works very quickly, is easily accessible and thinks along with you. The aftercare is completed as expected. DTT has delivered a clear, user-friendly and reliable app.’’
The experience we had with DTT as an app developer is very positive. They have a great ability to quickly and efficiently turn a joint idea into an actual working app. It is a proper challenge to develop a good concept with two independent housing cooperations in Amsterdam, Eigen Haard and The Alliance. With the commitment, expertise and pragmatic hands-on approach, DTT's work is beyond expectation. Through good, direct and precise communication we have created a great product in a very short time. Recommended.
We have asked DTT to re-design the My Tentoo hour declaration system for our customers. DTT has made a high-end desktop, tablet and mobile design, while taking into account our customer requirements. The cooperation was good and constructive.
“We have given DTT the assignment to develop a logbook/inspection app for our business. After working with DTT for 2 years, the end result was extremely positive. DTT is currently still working on new developments for our business app. The new app helps our employees to work faster, more efficient and more effective. Great to see that everything within our business has been fully automated, with thanks to the thoughtful team of DTT. Doing Things Together.”
"We worked very well with DTT. From the very first contacts they made a professional and skilled impression.
In all phases they are punctual, accurate and even better, they think along with possible alternatives and solutions. We completed the project on time and within budget. DTT also provides the agreed quality. What is special about Dylan and Jeffrey: they honor their agreements.
I would recommend everyone to do business with DTT."
Erwin van Wegen, Senior researcher Neurorehabilitation
Since 2012 we have been doing business with DTT to develop our Parkinson Exercises Android app in different languages. We work from a non-profit foundation with charitable objectives and in the beginning we had a lot of budget-friendly solutions. After DTT has converted our first iOS app into Android app, they became our go-to developer for Android versions of our app in multiple languages. The latest French version has a more complex development challenge with an in-app purchase and code access system. DTT has quickly and efficiently implemented it. Employees are flexible, work good and fast and respond promptly to emails and phone calls. Overall, a good company with excellent employees.
Together with DTT we have made an app in which we provide sex education to people with a mild disabilities. Developing an app was a new experience for us and for DTT it was a completely new target group. DTT employees were able to translate our wishes and convert them into a beautiful design and concept, which matched well with the target group. The DTT team listened very attentively and the communication was very pleasant. We are very proud of our result and the product meets our expectations.
So far, DTT has built 4 Android applications for us on behalf of our customers. The success of this cooperation has recently been extended, DTT can also develop our iOS applications now. Commitment, professionalism and quality are at a high level. Framez Media is a very satisfied customer of DTT.
"Our task had an absurd deadline, scope-creep all over the place and a fixed price. DTT made it happen. With these stressful conditions, DTT has developed a product we are extremely pleased with. The commitment to meet deadlines is commendable, work didn't stop even during evenings and nights and quality is simply beyond comparison. For me, DTT has proven to be a very knowledgeable and knowing company. All this gives me the confidence to pick up the phone and call them directly for the next assignment."
As a study association, communicating to your members is of great importance, which is why an application is of great added value to us. DTT had carefully discussed the possibilities and use of the application with us. Jeffrey was very helpful, and I always received answers to my questions and demands. We, as medical faculty association of Nijmegen, are very proud of our application!
Romke de Vries, Technical director and co-founder
From the first contact we were very well supported by the DTT team. DTT suggests additional ideas and options for our native Android and iOS Daalder Payment app and responsive website. For our services a continuous process of improvement and adequate bug resolving is very important, DTT is always ready to diagnose problems and resolve them.
Last year we launched Festive - a platform for the event industry. After contacting a number of app developers in Amsterdam, we knew that DTT was the right company to develop the iOS and Android applications for the platform. We successfully launched a great application at the scheduled time in April 2015.
We were looking for a suitable partner for developing an app and soon found out about DTT. After the first phone call we got a clear picture about the various ways to develop an app and the pros and cons of these options. The offer was clear and good in terms of pricing. We quickly had an app developed that exactly met our needs. Our next app will also be developed by DTT.
"Adante E-meeting provides solutions for paperless meetings of your organization. Together with DTT, we have developed an app that allows the user to keep the documents for the current meeting and agenda on the iPad. With the app, you can also add annotations in the documents.
We spoke with a number of vendors and selected DTT. DTT sets itself apart with their strong involvement in the development of the app. DTT thinks, looks for the best solution and gives an honest opinion where necessary. Jeffrey and his team communicate quickly and completely so you always have everything under control, and you never have to wonder how's it going. In short, DTT has been an excellent partner, and we will continue to co-operate with DTT for the further development of the app especially."
Glass Solutions was looking for a flexible company that could quickly develop an app. We've sent out our assignment and DTT reacted accurately and fast. Also during the fulfilment of the assignment they maintained a great service level. The realization of the app on Android and IOS, both phone and tablet is completely provided by DTT. Co-operation with the DTT team was excellent, with adequate and clear communication. Glass Solutions is a satisfied customer.
Bart Willemse, Owner
We approached DTT for the development of an internal iPhone app, we knew exactly what we wanted and what the challenges were. Several other app developers promised that they could deliver this app as well, but DTT was the only company that showcased that they could develop this application with the help of a video. This gave us the proof that we we’re talking to the right company, and that is proven! Quick and correct responses to our questions and no fuss with minor changes. In short, we will certainly use their services more often.
MobiGreen, Vanenburg Group BV
Henk de Vreugd, General Manager
"For the development of our MobiGreen mobile application we have chosen the services of DTT. In hindsight, the right choice. Our experience with DTT is:
Good technical expertise
Reliable partnership with modern approach
Proper price/ performance ratio
Hopefully we will have many years of pleasant co-operation."
Mark Berntssen, Sales and Marketing Manager
4Sight develops Virtual Reality for the urban planning industry. Thus we support and advise governments and developers in marketing their plans. With visualizations you can create more understanding, trust and support for the property development and infrastructure projects. We have asked DTT to extend our pallet of visualization products by an iPad application for infrastructure projects. Besides the very pleasant and open collaboration, DTT offers a quality product, with fast delivery terms at a very competitive rate. Multiple suppliers are able to deliver quality, but next to that, commitment and customer orientation in favor of the client is a second nature for DTT!
MILK Strategy & Finance is one of the most prominent strategic and financial consulting companies for small and mid-market. Our services include: Financial Management, Mergers & Acquisitions and Strategic Management. We have worked with DTT on the development of a new strategy to advance the website of one of our customers. The speed and service provided by DTT makes them a pleasant business partner to work with.
Arnold Gruppen, Owner
We decided to build a Mobile application to provide our advertisers with an extra platform and to react on the current consumer demand. For this project we approached DTT. We are very satisfied with the short delivery time that was needed to finish the application. The level of communication was above expectations as well. In fact, they chased us more, than we needed to chase them to finish this project :) The result is very pleasing. Next to that, the after sales service was just great.
Want to know how we can take your project forward?
Please contact us via phone or e-mail. We will be happy to help.