Make Better Qt Applications. Rapidly.

Felgo extends Qt with 200+ APIs, Unique Tooling and Cloud Services.

Felgo at a Glance

Check out the latest handout and Felgo QML component reference. Get a quick overview about the most important Felgo features, services and most useful Felgo and Qt QML components.
Perfect to print and put on your desk!

Felgo Professional Services

All services are offered on-site, remote or in our Vienna office. Available internationally.

  • Mobile, Desktop & Embedded
  • HMI and UI/UX development
  • Standalone or support dev team
  • Qt application optimization
  • Cross-platform development

Qt Development Services

  • Qt & QML development
  • Felgo development
  • Cross-platform development
  • HMI development
  • Qt workflow optimizations

Qt Trainings & Workshops





years on


"I am using Felgo Live code reloading and my feedback is.. WOW! It is SO much easier!! So fast! I've several devices connected at once and it's worked perfectly. This is already speeding up my development massively."

Darren Brown

“Using Felgo as a front-end with simple off the shelf components, QML for custom visual components and the entirety of Qt and C++ as a back-end makes even the most difficult apps easy to build.”

Fayzan Ahmed

"If I only knew about Felgo before! It would have saved us about 50% of the development time compared to plain Qt, and we would have been able to focus on the app itself, instead of recreating problem solutions that are already provided by Felgo, and that are not unique or specific for our app. So, please: Don’t make the same mistakes, use Felgo! Just as we will, from now on."

Oliver Kuss

What our Customers Say

Native UI/UX from a Single Code Base

Create iOS and Android apps with native look and feel, with 100% shared code base.

  • Native iOS / Cupertino styling
  • Native Android & iOS controls and navigation
  • Display cutout & notch support
  • Share code for mobile, desktop and embedded

Live & Hot Reload

Accelerate your development speed with live code reloading.

  • Instant reload of QML & JS code. Persisted state.
  • Simultaneous testing on multiple devices
  • Save hours on time-consuming deployment
  • Simulate platforms at runtime
  • Develop for iOS from Windows and Linux
  • Deploy OTA updates of your live application

Felgo Cloud Builds (CI/CD)

Automate your workflows to save precious time.

  • Exclusive CI/CD for Qt and Felgo projects
  • Automated builds for mobile,
    desktop & embedded
  • Integrate with your existing CI/CD
  • Cut time for setup & maintenance of tools, Qt versions & dependencies
  • Cut time to build updates & test versions
  • Integrate with Git/SVN
  • Hosted by Felgo or on-premise

Native Plugins & Integrations

No need to reinvent the wheel. Integrate third party services and platform-specific functionality into your applications.

  • Push notifications (OneSignal, Google)
  • Analytics (Google, Firebase, Amplitude)
  • Facebook
  • Firebase (user authentication, realtime database, cloud storage)
  • Ads & In-app purchases (subscriptions)
  • Beta testing + crash Reporting

Felgo Cloud Services Backend & Frontend

The Qt-friendly cross-platform backend solution.

  • User authentication via Email, Facebook, Google
  • Friend management, user search
  • QML UI, fully styleable
  • Gamification (achievements, leaderboards)
  • Chat & push notifications
  • Cloud data storage
  • Realtime data sync
  • Hosted by Felgo or on-premise
  • Works on mobile, desktop & embedded

Augmented Reality, AI, Machine Learning

  • Image & Object Recognition
    Use the device's camera to track images and 3D objects in realtime.
  • Geo AR
    Use the device's sensors to track points of interest (POIs) in realtime.
  • Instant Tracking
    Use the device's sensors and camera to position virtual objects in the real world.
  • Cloud Recognition
    Store your recognition data in the cloud and edit it while your app is already published.
  • TensorFlow
    Artificial intelligence & machine learning

The future is now. Add augmented reality or machine learning powered by Felgo APIs.

Embedded Development with Felgo

Create high performance embedded system apps & second screen apps. Native performance and rapid UI creation, powered by C++ & JavaScript. Learn more about embedded development with Felgo on this dedicated page.

Native Navigation

The navigation paradigms on iOS and Android are different. On iOS you have a swipe-back gesture to navigate back in a navigation stack. On Android you usually use a navigation drawer that slides in from the left side. Felgo Apps abstracts these navigation differences and allows you to use just a single Navigation component, that works cross-platform.

Simulate Platform at Runtime

Speed up your development and testing time with the live platform simulation feature by Felgo: Simulate any platform and change it at runtime on your PC!

The native components and navigation automatically change their style to the new platform. This allows you to rapidly test how your app looks like on iOS and Android on your Desktop PC. The start time of your app goes from 1-2 minutes, down to just a few seconds!

Responsive Design

Did you optimize your app for smartphone AND tablet already? This can be a tricky challenge, because with wider screens you can show more information in your app and make the user experience even better. If you optimize for smartphone only, you’re reducing your potential for success.

With Felgo, you don’t need to change your existing code but can use the same source code for phones & tablets. You get a “tablet view” with a navigation page on the left and the actual content page on the right automatically when the screen gets bigger.

Save 80% code and more!

Felgo allows you to save huge amounts of code, compared with pure Qt projects, or other frameworks and languages. This results in less maintenance effort, fewer errors and increased development speed.

Here are 2 quick case studies, to show you the potential code savings for your own applications.


Felgo lines of code

Qt lines of code

1,900 QML
10 C++
1,910 total
92% less source code!

7,200 QML
16,000 C++
23,200 Total

450 QML

10 C++

460 total


80% less source code!

820 QML
1,470 C++
2,290 total


Let's make something great together and join our satisfied customers:


Felgo can be used with both the open-source and the commercial Qt licenses.

Do I need a Qt commercial license for Felgo?

No. The Qt open-source license requires you to comply with LGPLv3, but this does not mean that you need to share your own source code.

If I use the Qt open-source license, do I need to make my project open-source?

Felgo adds components, tooling and services on top of the Qt core. The Qt core itself is unmodified and you will be able to use your existing code together with Felgo.

I have existing Qt code, can I migrate and re-use it with Felgo?

Your published apps will stay fully functional, also after your license expires. You will not be able to release new updates that include commercial Felgo features, after your license expires.

What happens to my published apps, if my Felgo commercial license expires?

If you have questions about our licenses or billing, please get in touch with us by Email.

My question is not answered here. What can I do?

Felgo offers a free license for Personal use. Commercial users of the Enterprise license can obtain access to the source code, based on individual agreements. Demos and examples provided by Felgo are open-source.

Is Felgo open-source?

Felgo plugins can also be integrated into Qt projects that do not use any Felgo components. You can contact us to get more info.

Can I use Felgo plugins for monetization, analytics and more in my Qt app?

Start Developing Now!

Voted #1 for:

  • Easiest to learn
  • Most time saving
  • Best support

Develop Cross-Platform Apps and Games 50% Faster!

  • Voted the best supported, most time-saving and easiest to learn cross-platform development tool
  • Based on the Qt framework, with native performance and appearance on all platforms including iOS and Android
  • Offers a variety of plugins to monetize, analyze and engage users
create apps
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level editor
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