Flutter Agency from Cologne

Cross-platform app development with Flutter

From the first idea through UI/UX and development to the app store launch, we support your project end-to-end.

One codebase for iOS, Android and the web: as a Flutter agency, we build high-performance apps with a native look and feel – faster and more cost-effective than developing everything twice.

PagoPace app: payment card in the walletPiening Personal app: employee dashboardPharmacy app: redeeming an e-prescriptionOnkoPass: medication schedule
Sports app: Bundesliga match daypool.down app: start screenPharmacy app: offers and servicesOnkoPass: start screen
Marketplace app: merchant listingsMagic Ads: ad previewPagoPace app: card overviewpool.down app: overview
Flutter logo
Efficient technology for modern apps

What is Flutter?

Flutter is an open-source UI framework by Google: apps for iOS, Android and the web are built from a single codebase – compiled to native code and rendered by Flutter's own engine.

Developed and backed by Google: Google has been driving Flutter forward since 2017 and uses it in its own products.

In production worldwide: companies of all sizes increasingly rely on Flutter for their apps – the most widely used cross-platform framework today.

A mature ecosystem: a large developer community, thousands of well-maintained packages and regular releases make Flutter a safe long-term investment.

Proven in our projects: from PAGOPACE to the e-prescription app to Piening Connect – many of our production apps run on Flutter.

At a glance

The advantages of Flutter

Flutter combines the efficiency of cross-platform development with the quality of native apps. These four advantages win our clients over every time:

Lower costs & faster time-to-market

One codebase for all platforms cuts development time and costs by up to 30%. Your product reaches the market sooner, and the saved budget goes into growth and features.

Native performance

Flutter compiles to native code and renders with its own engine directly on the GPU. The result: smooth animations and short loading times.

Flexible UI design

Flutter's widget system implements any design pixel-perfectly – from Material Design to a fully custom brand experience, consistent across all devices.

Seamless system integration

Camera, NFC, Bluetooth or native SDKs: through platform channels we reliably integrate any native interface into your Flutter app.

Not sure whether Flutter is the right technology for your project?

In a free initial consultation we will assess together whether Flutter fits your requirements – or whether React Native or native development is the better choice.

Book a free consultation
Your Flutter agency for the entire product lifecycle

Our Flutter services

From concept to operation: we cover the complete lifecycle of your Flutter app – or strengthen your existing team with our expertise.

Flutter app development

Building your B2C or B2B app with Flutter – from MVP to a scalable enterprise solution for iOS, Android and the web.

API & backend integration

Connecting REST and GraphQL APIs, Firebase or your existing backend – including native SDKs we make available in Flutter through custom bridges.

UI/UX & state management

Pixel-perfect, on-brand interfaces with clean state management (e.g. BLoC, Riverpod) for maintainable, high-performance apps.

Flutter for web & desktop

One codebase, more reach: we also ship your Flutter app as a responsive web app or desktop application.

Testing & quality assurance

Automated unit, widget and integration tests plus CI/CD pipelines ensure stable releases in both app stores.

Flutter consulting & team extension

Migration advice, code reviews or experienced Flutter developers for your team – flexible, as needed.

Success stories
with measurable results

GUTEFRAGE.NET / HIGHFIVVE

Largest German-language question-and-answer portal

Anyone looking for an app development agency will be delighted with Johnny Bytes. We held a workshop with gutefrage.net on the topic of apps and app SDKs and had a very in-depth and detailed exchange. The knowledge and experience that Johnny Bytes brings to the table is remarkable.

Nepomuk Seiler, Head of Engineering, gutefrage.net
Nepomuk Seiler
Head of Engineering, gutefrage.net
JUST HEALTH GMBH

Therapy management platform for leading German cancer centres

Johnny Bytes was a complete game-changer for our digital health app. Their expertise is outstanding; they got up to speed in record time and drove our development forward with decisive technical insights. We absolutely recommend them for any complex app project.

Maximilian Roederstein, Co-Founder, JustHealth GmbH
Maximilian Roederstein
Co-Founder, JustHealth GmbH
EMPOWER GMBH

World-leading provider of Microsoft Office applications

In the development of our software suite, we faced complex challenges. Johnny Bytes provided more than just strategic advice; they actively supported our development process and were decisive in its successful execution.

Stephan Kuhnert, Managing Director, empower GmbH
Stephan Kuhnert
Managing Director, empower GmbH
APOTHEKE LUX 99

Leading pharmacy for medical cannabis

We wanted more than just an off-the-shelf e-prescription app; we needed a solution perfectly tailored to our pharmacy's specific workflows. Johnny Bytes' expertise in digital health was clear as they understood and executed our vision in perfect detail. The result is our very own app, which is a tremendous asset for both our customers and our team. For anyone seeking a truly custom solution, you've come to the right place.

Tobias Loder, Inhaber, Apotheke LUX 99
Tobias Loder
Inhaber, Apotheke LUX 99
READFY

Pioneer and leader in ad-supported e-book readers

With Readfy, up to half a million users regularly read over 130,000 ebooks for free. Johnny Bytes took over the apps for iOS and Android from our previous nearshore partner and not only brought them and the backend up to date in a very short time, but also ensured that in-app sales increased by 500%.

Philipp Ortmaier, CEO, readfy GmbH
Philipp Ortmaier
CEO, readfy GmbH
PAGOPACE

Leading provider of NFC payment rings.

We were already able to offer our customers good hardware with our payment ring. However, Johnny Bytes helped us to build the perfect complementary software to take our product to the next level. We were kept up to date at every stage of the app development and were able to make requests immediately. With the new app, we can also sell our rings in retail stores, as customers can link their rings directly to their payment card on their cell phone.

Steffen Kirilmaz, CEO, PAGOPACE GmbH
Steffen Kirilmaz
CEO, PAGOPACE GmbH
FIRST AVENUE

#1 media house in South Tyrol

Johnny Bytes has taken over the development and support of our guest information system TIPPTHEK and migrated it to a modern and sustainable architecture in a very short time. This allows us to install TIPPTHEK in thousands of South Tyrolean accommodations and provide up to 35,000 tourists a day with personalized information about their accommodation and the surrounding area.

Michael Hölzl, CEO, First Avenue GmbH
Michael Hölzl
CEO, First Avenue GmbH
STAZZLE

Innovative solutions for temporary staffing and recruitment

An agile team for whom customer satisfaction is just as important as quality, the Johnny Bytes team understands communication and requirements, asks the right questions, has a sense of humor and adheres perfectly to schedules. A strong partner that we recommend without reservation. Thank you for your support!

Tasso Mitsarakis, Product Owner, stazzle
Tasso Mitsarakis
Product Owner, stazzle
KOOPERATIONEN MIT HOCHSCHULEN

Innovative projects with research institutions

Together with Johnny Bytes, FH Aachen regularly conducts practice-oriented research projects as part of the Digital Lab. Most recently, prototypes for Alexa skills and AI-supported tourism solutions were created in this context. These projects are always an enrichment for our students, the university and the company.

Prof. Dr. Mathias Eggert, FH Aachen
Prof. Dr. Mathias Eggert
FH Aachen

One codebase, both platforms, full quality

Discuss your app project with us. We will tell you honestly whether cross-platform is right for your case.

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Your personal contact

Would you rather talk to us directly and in person? Then do not hesitate to get in touch with us.

Thomas Henz
Thomas Henz
Your contact for new projects