There are many custom software development companies in the world. But how to find a reliable partner? The one that has the tech and domain expertise you need, fits your budget, and which you can trust? To make your choice easier, we've researched top custom application development companies, their profiles, available talent pool, and experience. To help you navigate the list, we've grouped them according to geolocation: Eastern Europe, Western Europe, USA, UK, and Asia. So, here are 25 vendors which can help you with custom application development.
How we selected top custom application development companies in the world
We have studied multiple sources, such as custom application development companies’ profiles on Clutch.Co, GoodFirms.co, and other research platforms. Also, we have taken into account key industry awards such as Global Outsourcing 100 by IAOP, GSA UK, and Software 500. To gather essential information about these custom application development companies, we have browsed their LinkedIn accounts, websites, and portfolios.
Custom application development companies in Eastern Europe
Eastern Europe is one of the leading IT outsourcing destinations worldwide. Many businesses from the USA, the UK, Europe, and Asia benefit from the talent pool of the region, as tech industry there has more than 1,051,000 experts.
What is even more convincing is that 10 Eastern European countries take leading positions in 2019 A.T. Kearney Global Services Location Index. They were chosen due to financial attractiveness, human capital availability, and business environment.
- N-iX
N-iX is a European software development company with over 20 years of experience on the market. The company has over 2,000 IT professionals on board. It partners with over 100 businesses globally, such as Lebara (a renowned telecom brand), Currencycloud (a global payments platform), Gogo (a world’s leading in-flight internet provider), HotSchedules (a US hospitality leader), the company has long-standing experience in big data analytics, data science, BI, AI, blockchain, cloud solutions, VR & AR, enterprise mobility, embedded software, SAP and OpenText professional services, and much more.
Also, this custom software development company has been included in Top 100 Global Outsourcing companies by IAOP and shortlisted for the Global Sourcing Association Awards. The Clutch Leaders Matrix regularly adds the company to the lists in different categories.
- STX Next
Based in Poznań, Poland, the company provides custom application development services and cross-platform mobile app solutions to clients across all industries using Python Django, Twisted, ReactJS, React Native, and more.
- NetGuru
The company offers custom application development services, such as product design, web development, mobile application development, tech support, and machine learning. This vendor cooperates with businesses of all sizes. 
- Jelvix
The company has expertise in all major industries, such as fintech, logistics, healthcare, and others. The company’s custom software development covers all stages. It includes market analysis, UI/UX design, testing, and support.
- Qulix Systems
The company provides custom application development services, including software development, custom mobile app development, testing, and UI/UX design. They cooperate primarily with mid-market businesses.
- Scand
This custom application development company is located in Minsk, Belarus. They provide tailored software development for IoT, augmented and virtual reality. Also, the company specializes in web application development, desktop application development, mobile application development, DevOps, and testing.
- Developex
With headquarters in Ukraine and a representative office in Canada, this custom application development company cooperates with businesses in all corners of Europe, North America, Australia and Asia. The company delivers solutions for consumer electronics, controlling software for gaming, audio, and PC peripheral devices.
- CHI Software
It is the development center, which specializes in custom application development services. They work with different industries, such as e-commerce, finance, travel and more.
- Beetroot AB
It is a Ukrainian-Swedish IT company, which works with businesses of all sizes. The company’s engineers develop both native and cross-platform solutions. Some of the service areas they cover are software development, operations, art, and design.
- Intellectsoft
It is a digital transformation consultancy with a development centre in Ukraine. The company’s main services are custom software development and custom mobile app development.
- еvozon
Straight from Transylvania, this end to end software development provider covers various industries, such as telecommunication, healthcare, e-commerce, and others. Its engineers create concept, design, architecture, testing, and support.
Custom application development companies in Western Europe
Although in Western Europe it is more common to outsource IT services, the market can boast of some trustworthy custom application development companies.
- Niji
This French custom application development company is entirely dedicated to the digital transformation of enterprises. They specialize in mobile app development, app design, digital marketing, and more.
- *instinctools
This German custom software development company has been developing custom applications for different types of businesses since 2007. They have proven expertise in education, healthcare, online media, e-commerce, and other industries.
- SaM Solutions
It is an international and software solutions provider with over 20 years of experience. The company’s focus is on IT consulting and custom software engineering services for both European and US markets.
Custom application development companies in the USA
The demand for application development vendors is growing in the United States. Although it is rather pricey in this region, the companies provide services of high quality.
- 10pearls
Having over 15 years of experience in the IT market, this custom software development company provides services, such as DevOps, enterprise software development, mobile and web app development, and more.
- Vincit California
This company is located in Orange County, Santa Monica and Palo Alto in California, and Finland. It develops mobile apps, web applications, embedded systems, artificial intelligence, and others. 
- Indium Software
This custom software development company delivers exceptional, customer-centric solutions across application testing, BI, Big Data consulting, and custom application development.
Custom application development companies in Asia
The region takes leading positions in the global IT outsourcing market. Businesses all over the world outsource IT services to India, China, the Philippines, Malaysia, and Singapore.
- Daffodil Software
This Indian custom software development company cooperates with businesses of all sizes and develops web, mobile, and cloud solutions. Its engineers also provide continuous support and maintenance of the projects. 
- Impiger Technologies
This custom application development company specializes in mobile app development and development of cloud and web applications. It offers UI/UX design, cloud consulting, and testing.
- Capital Numbers
This company offers the whole cycle of custom software development services. Apart from that, it specializes in the development of websites, web applications, portals with complex functionality, and custom mobile apps. 
- Dew Solutions Pvt Ltd
This company specialises in custom software development services, mobile app development, web development, and more. The vendor provides service primarily to small businesses.
- Clarion Technologies
Headquartered in Pune, India, this custom software development company cooperates mainly with small and midmarket businesses. The company’s areas of expertise are web application development, content management systems, e-commerce, mobility, software testing, IoT, and more.
Custom application development companies in the UK
The price for custom application development services is rather high in the UK, yet there are a few custom software development companies there. So, we have shortlisted a number of reliable vendors.
This IT vendor’s main focus areas are custom software development, e-commerce, and IoT. This custom application development company cooperates primarily with mid-market businesses.
- Magora
This is an experienced mobile, web, and software development company with offices in the UK and other countries. Its professionals develop digital products including mobile apps, websites and web applications.
- Systango
Headquartered in London, the UK, it is a specialized software studio that offers IT and product engineering services to organisations of different sizes. The company specializes in mobile app development, web development, BI, IoT, and many others.
Why choose N-iX as your custom software development company?
- N‐iX is one of the fastest-growing IT companies with offices and deivery centers in Ukraine, the USA, Sweden, Poland, Malta, and Bulgaria that provides custom application development services to businesses across the globe.
- We work with companies across various industries, such as fintech, insurtech, telecom, retail, finance, automotive, healthcare, and many others.
- Our engineers develop a software product from scratch to final release, as well as handle particular development stages (such as architecture design, UI/UX, implementation, QA or support).
- Many awards, as well as recommendations on various platforms, such as Clutch.Co, GoodFirms.co, and others confirm that we are a trusted business partner for custom application development.
