A website can look great in one browser and break completely in another. That is still a common issue, even with modern development tools. Differences in rendering engines, browser versions, operating systems, and devices can create unexpected problems that affect usability, accessibility, and overall user experience.

Because of that, many organizations work with specialized development and testing companies that understand how to build and validate digital products across multiple browsers and platforms. In this list, we look at 15 cross-browser compatibility companies that provide services ranging from frontend development and quality assurance to browser testing, web application development, and ongoing support. Each company approaches the challenge differently, making this list a useful starting point for businesses comparing potential partners.

1. Oski

At Oski, we develop custom software, web applications, and content management solutions for businesses that need reliable digital systems across different environments. Our work covers frontend development, cloud technologies, CMS platforms, and software integration. Cross-browser compatibility is supported through our frontend development practice, where technologies such as React, Vue, Angular, Next.js, and standard web technologies are used to build applications that function consistently across browsers and devices.

We work with companies in industries including e-commerce, logistics, travel, education, fintech, and insurance. Alongside development, we provide deployment, maintenance, cloud infrastructure support, and AI integrations. Our projects often combine frontend interfaces, backend systems, and content management platforms into a single solution that can be maintained over time.

Key Highlights:

• Develops web applications using React, Vue, and Angular

• Builds CMS solutions with WordPress and Umbraco

• Supports cloud infrastructure and DevOps practices

• Provides software deployment and maintenance

• Develops AI-powered functionality and integrations

• Works across multiple business sectors

Services:

• Cross-Browser Compatibility

• Cross-browser Web Development

• Frontend Development

• React Development

• Vue.js Development

• Angular Development

• HTML/CSS Development

• UI/UX Design

• Web Application Development

Contact Information:

• Website: oski.site

• Phone: +48571282759

• Email: [email protected]

• Address: Estonia, Tallinn, Kaupmehe tn 7-120, 10114

• Linkedin: www.linkedin.com/company/oski-solutions

2. 21 Century Tech

21 Century Tech is a software development studio that combines software engineering with AI-assisted development workflows. Their teams use AI tools alongside human review processes to build, test, and maintain software products. This approach is applied across different types of projects, including web applications, product development, integrations, refactoring work, and frontend systems that need to perform consistently across browsers and environments.

Their development process includes architecture planning, testing, documentation, deployment, and continuous integration practices. The company focuses on software delivery supported by automated code generation, test coverage, and engineering oversight, with human engineers responsible for reviewing and validating the final product before release.

Key Highlights:

• Combines software engineering with AI-assisted development

• Uses human-reviewed development workflows

• Supports testing and documentation processes

• Develops web applications and software products

• Handles software refactoring and integrations

• Includes CI/CD as part of delivery workflows

Services:

• Cross-browser Web Development

• Custom Software Development

• Web Application Development

• Frontend Development

• Software Refactoring

• Third-party Integrations

• CI/CD Implementation

• Quality Assurance

• Software Testing

• Technical Documentation

• Product Development

Contact Information:

• Website: 21century.tech

• E-mail: [email protected]

3. IT Cubez

IT Cubez focuses on frontend technologies and cross-browser compatibility services designed to help websites and web applications work across different browsers and devices. Their approach includes browser testing, responsive design practices, standards compliance, JavaScript compatibility checks, and the use of modern HTML, CSS, and JavaScript techniques.

They also work with methods such as progressive enhancement and graceful degradation to maintain functionality across varying browser capabilities. Their process includes testing, feature detection, performance considerations, and compatibility validation using different browser testing tools and development frameworks.

Key Highlights:

• Focuses on cross-browser compatibility services

• Performs browser testing and validation

• Uses progressive enhancement approaches

• Supports responsive and mobile-friendly development

• Works with modern web standards

• Utilizes browser testing tools and validators

Services:

• Cross-browser Compatibility Testing

• Frontend Development

• Responsive Web Development

• Browser Testing

• JavaScript Compatibility Testing

• Mobile Compatibility Testing

• UI/UX Development

• Web Development

• Software Development

• API Development

• CRM Solutions

• ERP Solutions

Contact Information:

• Website: www.it-cubez.com

• Phone: +966 55 046 3780

• E-mail: [email protected]

• Address: AL ZUAIBI TOWER 2ND FLOOR, OFFICE NO - 201, DAMMAM -10455 , PO BOX -32415 Kingdom of Saudi Arabia

• Facebook: www.facebook.com/people/It-Cubez/61556697713141

• Twitter: x.com/IT_Cubez

• LinkedIn: www.linkedin.com/company/itcubez

• Instagram: www.instagram.com/it_cubez

4. SoftPro

SoftPro develops custom software, web applications, and cloud-based systems for businesses that need digital tools tailored to their workflows. Their team works with frontend and backend technologies, Microsoft-based development frameworks, and cloud platforms to create applications that can be used across different environments. Cross-browser compatibility is supported through their web application development work, where responsive interfaces and modern web technologies play an important role.

They also work on business portals, CRM and HRM systems, SaaS platforms, and support systems. Alongside software development, they provide cloud development and artificial intelligence services, allowing businesses to combine multiple technologies within a single project when needed.

Key Highlights:

• Develops custom software and web applications

• Works with frontend and backend technologies

• Uses Microsoft-based development frameworks

• Builds cloud-based solutions

• Develops business portals and SaaS platforms

• Provides AI-related development services

Services:

• Cross-browser Web Development

• Web Application Development

• Custom Software Development

• Cloud Development

• Artificial Intelligence Solutions

• Business Portal Development

• CRM System Development

• HRM System Development

• SaaS Development

• Support System Development

Contact Information:

• Website: soft-pro.pl

• Address: Poland, Warsaw, Mazowieckie Voivodeship, 13 Erasmus Ciołka St. 401

5. QAwerk

QAwerk focuses on software testing services, including cross-browser testing for websites, web applications, and SaaS products. Their work is centered on checking how products behave across different browsers, browser versions, devices, and operating systems. This helps development teams identify interface issues, functionality problems, and compatibility gaps before release.

Their testing process includes both manual and automated approaches depending on project requirements. They also provide testing for mobile browsers and work with commonly used browsers such as Chrome, Firefox, Safari, Edge, and Opera. In addition to compatibility testing, their broader QA practice covers functionality, usability, accessibility, and automation.

Key Highlights:

• Specializes in cross-browser testing

• Provides manual and automated testing

• Tests websites and web applications

• Supports mobile browser testing

• Works across major browsers and platforms

• Covers UI and functionality validation

Services:

• Cross-browser Testing

• Web Application Testing

• Mobile Testing

• Compatibility Testing

• Manual Testing

• Automated Testing

• Accessibility Testing

• Functional Testing

• API Testing

• Integration Testing

• Security Testing

• Dedicated QA Services

Contact Information:

• Website: qawerk.com

• Phone: +372 5368 6363

• E-mail: [email protected]

• Address: Estonia, Tallinn, Tornimae 7-36, 10145

• Facebook: www.facebook.com/QAwerk

• Twitter: x.com/qawerk

• LinkedIn: www.linkedin.com/company/qawerk

• Instagram: www.instagram.com/qawerk.testing

6. Net-Devs

Net-Devs develops enterprise software, cloud platforms, and frontend applications using a combination of senior engineering oversight and AI-assisted delivery processes. Their teams work across a range of technologies, including .NET, Java, Node.js, Python, Go, React, Angular, and Vue. Cross-browser compatibility is supported through their frontend development and testing practices, helping web applications work consistently across different browsers and devices.

Their projects typically include planning, design, development, testing, deployment, and ongoing improvements after release. The company also works with cloud-native systems, AI integration, infrastructure engineering, and quality assurance, bringing together different technical areas within a single development process.

Key Highlights:

• Develops enterprise software systems

• Works with React, Angular, and Vue

• Includes frontend testing in development workflows

• Provides cloud and platform engineering services

• Combines AI-assisted development with engineering oversight

• Supports deployment and ongoing product updates

Services:

• Cross-browser Web Development

• Frontend Development

• Enterprise Software Development

• Cloud Engineering

• Platform Engineering

• AI Engineering

• React Development

• Angular Development

• Vue Development

• Quality Assurance

• Automated Testing

• Infrastructure Engineering

Contact Information:

• Website: net-devs.com

• Phone: +48 571 282 759

• E-mail: [email protected]

• Address: Obrzeżna 1D, 02-691 Warszawa, Poland

• LinkedIn: www.linkedin.com/company/net-devs

7. QACraft

QACraft provides compatibility testing services for web, mobile, and enterprise applications that need to work reliably across different environments. Their work focuses on checking how software behaves on various browsers, operating systems, devices, and network conditions. Cross-browser compatibility is a core part of their testing approach, helping teams identify issues before software reaches end users.

They also cover mobile, device, network, and operating system compatibility testing as part of a broader quality assurance process. Their testing activities are designed to support applications used across multiple platforms, screen sizes, and hardware configurations, helping development teams maintain a consistent user experience.

Key Highlights:

• Focuses on compatibility testing services

• Provides cross-browser testing

• Tests software across different devices

• Covers operating system compatibility

• Supports mobile application testing

• Includes network compatibility validation

Services:

• Cross-browser Compatibility Testing

• Software Compatibility Testing

• Mobile Compatibility Testing

• OS Compatibility Testing

• Device Compatibility Testing

• Network Compatibility Testing

• Cross-platform Testing

• Website Compatibility Testing

• Application Compatibility Testing

• Compatibility QA Services

Contact Information:

• Website: qacraft.com

• Phone: +91 9157 786 796

• E-mail: [email protected]

• Address: S9 Square, Near Lillleria Party Plot, Sama-Savli Road, Vemali Vadodara - 390008, Gujarat, India

• Facebook: www.facebook.com/QACRAFT

• LinkedIn: www.linkedin.com/company/qacraft-software-testing-company

• Instagram: www.instagram.com/qacraftindia

8. A-listware

A-listware provides software development, testing, consulting, and team augmentation services for companies across different industries. Their work covers web applications, enterprise software, cloud solutions, mobile applications, and digital platforms. Cross-browser compatibility is supported through their web development, frontend engineering, and QA services, where applications are built and tested to function across different browsers and user environments.

They work with a broad range of technologies and support projects from planning and design through development, testing, deployment, and maintenance. Their teams also provide infrastructure services, cybersecurity support, data analytics, and application modernization, allowing businesses to combine multiple technical needs within a single project.

Key Highlights:

• Provides software development and QA services

• Supports web and enterprise applications

• Offers dedicated development teams

• Works with cloud and infrastructure solutions

• Provides application modernization services

• Serves companies across multiple industries

Services:

• Cross-browser Web Development

• Testing and QA

• Software Development

• Web Development

• Application Services

• UI/UX Design

• IT Consulting

• Team Augmentation

• Cloud Application Development

• Enterprise Software Development

• Infrastructure Services

• Cybersecurity Services

Contact Information:

• Website: a-listware.com

• Phone: +1 (888) 337 93 73

• E-mail: [email protected]

• Address: North Bergen, NJ 07047, USA

• Facebook: www.facebook.com/alistware

• LinkedIn: www.linkedin.com/company/a-listware

9. DeviQA

DeviQA specializes in software testing and quality assurance services, with compatibility testing being one of its core areas of expertise. Their team works with web applications, mobile applications, cloud systems, APIs, and enterprise platforms, helping companies verify that products perform consistently across browsers, devices, operating systems, and network conditions.

Their compatibility testing process includes environment setup, test planning, execution, reporting, and validation after fixes are implemented. Alongside browser and platform compatibility testing, they provide automation, performance testing, accessibility testing, localization testing, and other QA services that support software quality throughout the development lifecycle.

Key Highlights:

• Specializes in compatibility testing services

• Tests across browsers, devices, and operating systems

• Provides manual and automated testing

• Supports web, mobile, and cloud platforms

• Covers accessibility and localization testing

• Offers dedicated QA team services

Services:

• Compatibility Testing

• Cross-browser Testing

• Mobile Testing

• Web Application Testing

• Test Automation

• Accessibility Testing

• Localization Testing

• Performance Testing

• Integration Testing

• Security Testing

• User Acceptance Testing

• QA Consulting

Contact Information:

• Website: www.deviqa.com

• Phone: +1 805 491 9331

• E-mail: [email protected]

• Address: New York City, 521 Fifth Ave

• Facebook: www.facebook.com/deviQASolutions

• LinkedIn: www.linkedin.com/company/deviqa

10. Lengreo

Lengreo works with companies on digital marketing, lead generation, website development, and related online growth activities. Their website development services include planning, design, implementation, quality assurance, and ongoing support. Cross-browser compatibility is supported through their website development and QA processes, helping websites function properly across different browsers and user environments.

They also provide SEO, paid advertising, content marketing, demand generation, and outreach services. Their work often combines website development with broader marketing activities, allowing businesses to manage both technical and promotional aspects of their online presence through a single partner.

Key Highlights:

• Provides website development services

• Includes quality assurance and support

• Combines development with digital marketing

• Works on business and eCommerce websites

• Supports lead generation initiatives

• Offers SEO and content marketing services

Services:

• Cross-browser Website Development

• Website Development

• Quality Assurance

• Custom Web Development

• SEO

• Paid Advertising

• Lead Generation

• Appointment Setting

• Demand Generation

• Social Media Marketing

• Content Marketing

Contact Information:

• Website: lengreo.com

• Phone: +31 686 147 566

• Email: [email protected]

• LinkedIn: www.linkedin.com/company/lengreo

• Instagram: www.instagram.com/lengreo.agency

11. Ramotion

Ramotion is involved in web design, branding, and digital product development, with a strong focus on web applications and user experience. Their content on cross-browser compatibility highlights the importance of creating websites and web applications that work consistently across different browsers, devices, and operating systems. Cross-browser support is addressed through development practices, testing processes, and the use of modern frameworks and tools.

Their approach covers common compatibility challenges such as layout differences, browser-specific behavior, HTML and CSS validation, responsive design, and testing across multiple environments. The company also discusses the role of browser testing in maintaining a consistent experience for users regardless of their browser choice.

Key Highlights:

• Focuses on web application development

• Addresses cross-browser compatibility challenges

• Works with responsive web design principles

• Covers browser testing practices

• Uses modern web frameworks and libraries

• Emphasizes consistent user experiences

Services:

• Cross-browser Web Development

• Web Application Development

• UI/UX Design

• Web Design

• Product Design

• Brand Design

• Frontend Development

• Responsive Web Design

• Website Testing

• Digital Product Development

Contact Information:

• Website: www.ramotion.com

• Phone: +1 888 410 8885

• E-mail: [email protected]

• Address: 28 Geary St suite 650, San Francisco, CA 94108

• Twitter: x.com/ramotion

• LinkedIn: www.linkedin.com/company/ramotion

• Instagram: www.instagram.com/ramotion

12. Gilzor

Gilzor develops custom software products for startups, small and medium-sized businesses, and product companies. Their work includes web development, mobile development, quality assurance, business analysis, UI/UX design, and product strategy. Cross-browser compatibility is supported through their web development and testing activities, helping applications remain accessible across different browsers and devices.

Their projects often cover the full product lifecycle, from idea validation and research through development, testing, launch, and ongoing support. Alongside technical development, they also assist with product planning, market research, and go-to-market preparation for businesses building new digital products.

Key Highlights:

• Develops custom software products

• Provides web and mobile development

• Includes quality assurance services

• Supports product discovery and validation

• Offers UI/UX design and business analysis

• Provides ongoing maintenance and support

Services:

• Cross-browser Web Development

• Web Development

• Mobile Development

• Quality Assurance

• UI/UX Design

• Business Analysis

• Product Validation

• Research and Development

• Consulting and Troubleshooting

• Support and Maintenance

• Go-to-Market Planning

• Custom Software Development

Contact Information:

• Website: www.gilzor.com

• E-mail: [email protected]

• Address: Poland, Warsaw, Office 58, street Adama Mickiewicza 37, 01-625

• LinkedIn: www.linkedin.com/company/gilzor-softwaredevelopment

13. Saxon Websites

Saxon Websites provides website design services with cross-browser compatibility included as part of its development process. Their work focuses on making sure websites display and function properly across different browsers and platforms before launch. Cross-browser testing is treated as a standard step in the design workflow, helping identify layout, rendering, and functionality issues that may appear in different browsing environments.

They also emphasize responsive design, website security, scalability, and the use of current web technologies. By considering browser compatibility during the design stage, they aim to reduce the need for major adjustments later in the project and support a more consistent experience for website visitors.

Key Highlights:

• Includes cross-browser compatibility checks

• Tests websites across multiple browsers

• Focuses on responsive web design

• Supports scalable website development

• Incorporates website security practices

• Uses modern web technologies

Services:

• Cross-browser Compatibility Testing

• Website Design

• Responsive Web Design

• Website Development

• Website Security

• Scalable Website Design

• eCommerce Website Development

• Web Technology Implementation

Contact Information:

• Website: saxonwebsites.co.uk

• Phone: 07597 278340

14. Mobian Studio

Mobian Studio develops software products for companies in areas such as healthcare, fintech, logistics, and information technology. Their work includes mobile applications, backend systems, cloud infrastructure, APIs, artificial intelligence solutions, and quality assurance. Cross-browser compatibility is supported through their frontend development and testing practices, helping web-based products work reliably across different browsers and devices.

They offer both dedicated development teams and full project delivery, covering planning, development, integration, deployment, and post-launch support. Their projects often combine mobile, web, backend, and infrastructure components within a single development process, supported by documentation and ongoing maintenance.

Key Highlights:

• Develops web and mobile applications

• Provides dedicated engineering teams

• Supports frontend testing and QA

• Builds cloud and backend systems

• Develops AI and automation solutions

• Offers post-launch support and maintenance

Services:

• Cross-browser Web Development

• Frontend Development

• Mobile App Development

• Backend Development

• API Development

• Cloud Infrastructure Services

• AI and Automation Solutions

• Quality Assurance

• Legacy System Integration

• Dedicated Development Teams

• Software Maintenance

• Product Development

Contact Information:

• Website: mobian.studio

• Email: [email protected]

• Address: Harju maakond, Tallinn, Kesklinna Linnaosa, Masina tn 22, 10113

• LinkedIn: www.linkedin.com/company/mobian-studio

15. ImpactQA

ImpactQA provides compatibility testing services for software products used across web, mobile, desktop, and connected device environments. Their compatibility testing practice focuses on verifying that applications work correctly across browsers, operating systems, devices, databases, and network configurations. Cross-browser testing is one of the key areas covered as part of their broader quality assurance services.

Their testing approach includes automated browser testing, forward and backward compatibility validation, and the use of dedicated test environments. Alongside compatibility testing, they provide functional, performance, security, mobile, and IoT testing services for organizations developing and maintaining digital products.

Key Highlights:

• Specializes in compatibility testing services

• Provides automated cross-browser testing

• Tests across devices and operating systems

• Supports forward and backward compatibility validation

• Uses dedicated testing environments

• Covers web, mobile, and IoT platforms

Services:

• Cross-browser Compatibility Testing

• Software Compatibility Testing

• Mobile Device Compatibility Testing

• Operating System Compatibility Testing

• Network Compatibility Testing

• Database Compatibility Testing

• Functional Testing

• Performance Testing

• Security Testing

• Mobile App Testing

• IoT Testing

• Quality Assurance Services

Contact Information:

• Website: www.impactqa.com

• Phone: +1 (347) 268-6188

• E-mail: [email protected]

• Address: 447 Broadway, 2nd Floor, New York, NY, 10013

• Facebook: www.facebook.com/ImpactQA

• Twitter: x.com/Impact_QA

• LinkedIn: www.linkedin.com/company/impactqa-software-testing-services

• Instagram: www.instagram.com/impactqa

Conclusion

Cross-browser compatibility is one of those things that often goes unnoticed when it works well and becomes obvious the moment it doesn't. A website or application may look perfect in one browser but create problems for users in another, which is why testing and compatibility work remain an important part of modern development.

The companies featured in this list approach the challenge from different angles. Some focus primarily on testing and quality assurance, while others include cross-browser compatibility as part of broader web development, software engineering, or digital product services. The right choice depends on what you need - a dedicated testing partner, a development team that builds compatibility into the project from the start, or a company that can handle both.

Taking the time to review their services, technical focus, and delivery approach can help narrow the options. In the end, the goal is fairly simple: make sure people can use your website or application without running into avoidable browser-related issues, regardless of how they access it.