Cross-Platform App Development

KeyUA is a cross-platform app development company that meets the needs of various industries. We use a solid set of programming languages and frameworks for the high-quality implementation of projects of any complexity. Our team guarantees fast and high-quality software development for Android and iOS platforms, which fully complies with clients’ requirements.

What is Included in Cross-Platform App Development Services

Modern cross-platform development allows you to create high-quality applications at an affordable price and get access to built-in features of operating systems. For more than 12 years, KeyUA has been delivering iOS and Android apps for various companies from startups to large corporations. We carefully study all the requirements of the business to create the most effective solution.
  • Custom Hybrid Approach
  • Mobile App Converting
  • Wearable Apps
  • E-Commerce Apps
  • Healthcare Apps
  • Third-Party Integration
  • High Performance Across Devices

Custom Hybrid Approach

Over our years of practice, our team has created more than 50 custom applications for Android and iOS platforms. We build software from scratch or modify existing solutions keeping high productivity and reliable security features.

  • Works on iOS & Android phones and tablets
  • Unique products creation
  • Best technology usage: React Native, Flutter, Cordova & Xamarin

Mobile App Converting

If you have a mobile app for one platform, and you want to port it to iOS or Android, we have a sound solution. Converting an application is not just copying it. This is writing the source code from scratch to make it compatible with the desired mobile operating system. Our team quickly and efficiently ports applications, while maintaining their high performance, full functionality, and thought-out design.

  • Fast time to market
  • Functionality improvement
  • Convenient navigation

Wearable Apps

Make your application even more affordable and attractive with cross-platform development for portable devices. Our team creates products for service and/or sharing on popular smartwatch and fitness trackers.

  • Compatible with Android wear & iWatch
  • Fitness functions and monitoring of vital signs
  • Advanced cloud-based capabilities

E-Commerce Apps

Do you need a personal platform to sell your goods or services? No problems! KeyUA will build a high-quality application for you that fully meets the specifics of your business. A custom mobile app is a sure-fire way to increase your sales.

  • Integration with payment gateways
  • Complete security of internal information and customer data
  • Solid CRM system

Healthcare Apps

At KeyUA we create accurate applications for tracking vital signs on Android and iOS. Our experience covers checking the symptoms of a disease, monitoring activity, maintaining indicators, tracking dynamics, and much more, depending on the goals of the business.

  • Software for medical staff and assistants
  • Maintenance of individual recovery programs
  • Medical records examination & maintenance

Third-Party Integration

Integration with third-party resources allows you to expand the functions of the application. Our team quickly and efficiently delivers API integration to help you improve business processes.

  • Extended features
  • Help in choosing a reliable provider
  • Technical advice

High Performance Across Devices

For top-notch business activities, any application must have high performance. It is believed that only native development provides high-quality functionality for the software. But KeyUA mobile developers build solid apps with robust functionality and fast query processing.

  • Quick search and advanced databases
  • Cost-effective solutions
  • Business based development

Cross-Platform App Development Solutions

The mobile application market is constantly expanding. So if you want to get around your competitors, you should take care of cross-platform application development. Our team will implement your ideas in the fastest possible manner.
Native UI
A beautiful and intuitive design encourages users to make purchases. We develop high-quality attractive layouts for the most popular mobile platforms that work in all systems.
Post-Deployment Support
Our team develops mobile applications and also supports them in the future at the request of the client. Maintaining apps on iOS and Android, updating functionality, or adding additional features - we can easily provide everything.
Mobile App Testing
Testing is one of the most important steps before launching a product on the market. Our team has outstanding quality assurance specialists who carefully check each project to make sure that the entire function is working correctly and in accordance with the requirements. We test not only using emulators, but also on real Android and iOS devices.
Comprehensive Process
We take an extensive approach to cross-platform mobile app development, which consists of forming a team of the most suitable specialists and using a solid technology stack. KeyUA specialists pay special attention to the needs of the business to help it grow.

Why KeyUA is the Best in Supporting Your Business

As a professional IT team, we develop cross-platform applications for various areas. We are fully focused on the needs of the client’s business and market conditions in order to create a great product. KeyUA's main features are high quality, fast speed of implementation, and the use of innovative technologies.

Strong web technology & mobile experience

Quality project management

Customized solutions

Result-driven approach

Clean and clear code

Cost-effective solutions

Understanding of business needs

Effective hybrid app development services

Professional QA team

Rapid prototyping

Non-disclosure agreement

No freelancers


years of expertise in multiplatform mobile app development


experienced team members


successfully delivered projects


data security

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Project Steps

Our development process is completely transparent. We always keep in touch with the client and are ready to answer all their questions.

Getting Requirements

We discuss with the client all the aspects, requirements, and nuances of the application, as well as business goals, in order to get a full understanding of the project.



Our technical experts analyze the requirements in order to draw up an implementation plan and a roadmap.


Team Forming

We create a team of the best specialists who can easily implement the necessary technologies.



Our designers create application mockups for Android and iOS in accordance with the requirements of the customer and marketing features.



We develop the application in accordance with the requirements, breaking the process into sprints. On average, one sprint lasts a week. During this time, we implement a given set of tasks and report to the customer.



As soon as the set of tasks is completed, our quality assurance specialists begin testing to make sure that the functionality works correctly.



After all the requirements of the project are met, we prepare for the launch of the product on the market, developing marketing strategies and advertising campaigns.



By customer request, we support the application even after release, updating the functionality or adding additional features.

Examples of Our Successful Projects

At KeyUA we provide services for beginner entrepreneurs, federal agencies, corporate clients, and large businesses. Over the 12 years, we have been delivering quality web apps to the market, most of which we support until now.

Clients Speak About Us

Customer satisfaction is our top priority, that is why we produce high-quality solutions.

Frequently Asked Questions

If you want to get an estimate of your project, we guarantee you a free consultation.
How much does it cost to build a cross-platform app?

Development prices vary depending on the type of application, its features, design and so on. At KeyUA, we guarantee the fairest prices, and we have both flexible and fixed price models. You can choose what suits your business. Contact our technical experts for an accurate assessment of your project and receive a price estimate.

What's the difference between native and cross-platform app development?

Native applications are developed for a specific operating system. Cross-platform development contemplates that the software will function on various mobile operating systems. Native development is more expensive, as it performs a better approach to building applications. KeyUA specialists have outstanding experience in building mobile applications, so our cross-platform development is characterized by high productivity of the product, top-notch functionality, and responsive design.

How long does it take to develop an app?

The duration of implementation depends on the complexity and volume of functionality. On average, developers need at least 2–3 months to build a cross-platform application. Our team always works hard to bring the product to market as soon as possible.

Contact Our Experts Right Now

We are here to help you develop your ideas and grow your business! Contact our experts for more information.
Manager Daria Maltseva

Daria Maltseva

Product Manager

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