Top Cross Platform App Developers
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$10,000+$25 - $49 / hr50 - 249London, England
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See all 2 projectsDecartel is a Mobile App Development company that excels in enhancing app visibility and user growth. Clients appreciate their dedication and timely delivery, with 100% of reviewers noting their cooperative teamwork. However, some suggest improvements in work efficiency. Overall, Decartel provides cost-effective solutions aligned with client values.
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$10,000+$50 - $99 / hr10 - 49Amsterdam, Netherlands
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See all 9 projectsZoftify is a specialized Mobile App Development company renowned for its expertise in iOS and Android development, focusing on enhancing app performance and solving complex issues. With a 100% positive feedback rate, clients praise their professionalism, rapid bug resolution, and high-quality implementation. Their client-oriented approach and seamless communication are frequently highlighted, with 75% of reviewers mentioning improved app performance and stability.
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$1,000+< $25 / hr10 - 49Ahmedabad, India
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See all 3 projectsTrust Infoways is a proficient mobile app development company specializing in iOS and Android platforms. Their clients consistently commend their quality of work, project management skills, and transparent communication, with 100% of reviews highlighting their expertise and timely delivery. Their adept handling of both application development and client relations has made them a preferred choice for many.
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$50,000+$100 - $149 / hr50 - 249Berlin, Germany
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See all 1 projectsSPRYLAB is a software development company renowned for its strategic advisory and development expertise, particularly in creating Software as a Service solutions. The company consistently receives positive feedback, with 100% of reviewers praising their collaborative approach, timely delivery, and understanding of industry-specific needs. Clients highlight SPRYLAB's commitment to shared success and innovative, customer-focused development processes.
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$1,000+Undisclosed50 - 249
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See all 3 projectsAllin Info Systems Pvt. Ltd. is a versatile web and e-commerce development company offering services such as custom programming, SEO, and CRM implementation. Across their reviews, 100% of clients praise their commitment, responsiveness, and ability to deliver projects on time, with 50% specifically highlighting their proactive project management and problem-solving capabilities.
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$5,000+$50 - $99 / hr50 - 249Cottleville, MO
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See all 11 projectsXTAPPS Software Solutions is a proficient Mobile App Development company offering comprehensive services, including application design, development, and support for iOS, Android, and cross-platform solutions. The overall feedback is overwhelmingly positive, with 100% of reviewers praising their communication, efficiency, and ability to deliver projects on time and under budget. Most reviewers highlight their competitive pricing and flexibility in accommodating client needs.
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$1,000+$50 - $99 / hr2 - 9Roma, Italy
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See all 2 projectsApp and Up Srl is a Mobile App Development company known for their expertise in restructuring codebases and finishing app development projects efficiently. With 100% positive feedback, clients consistently praise their quick delivery, attentive communication, and genuine interest in project success. They are highly valued for aligning well with client needs and offering excellent value for the cost.
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$1,000+$25 - $49 / hr10 - 49Warszawa, Poland
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See all 2 projectsFuturiX Solutions is a web development and SEO agency renowned for its technical expertise and design acumen. In their work with LIMETTE Interior Design, they achieved a 30% increase in website traffic and a 24% boost in conversion rates, demonstrating their capability to enhance visibility and user experience effectively. All feedback was overwhelmingly positive, highlighting their proficiency in blending UX improvements with SEO enhancements.
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$10,000+$25 - $49 / hr10 - 49Niš, Serbia
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See all 13 projectsCodeus is a proficient Mobile App Development company specializing in React Native for frontend and TypeScript for backend development, offering comprehensive services from app creation to maintenance. The reviews highlight their adaptability and professionalism, with 100% of the feedback being positive, emphasizing their strong project management, quality deliverables, and effective communication. Clients appreciate their dynamic approach and expertise in mobile software development.
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$10,000+$150 - $199 / hr2 - 9Pasadena, CA
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See all 11 projectsInteractivism is a dynamic UI/UX design firm known for its ability to handle complex interfaces and deliver high-quality design solutions. Renowned for excellent project management, they consistently meet deadlines and remain within budget, impressing clients with their adaptability and deep understanding of user needs. With a 100% positive feedback rate, clients commend Interactivism's professionalism, creativity, and valuable stakeholder management skills.
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$5,000+< $25 / hr10 - 49Surat, India
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See all 4 projectsSattvabit is a Mobile App Development company highly praised for its communication, professionalism, and delivery of projects within budget and on time. With 100% of reviewers highlighting strong communication and effective project management, the company is noted for its expertise in both iOS and Android development, providing great value for cost.
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$25,000+$25 - $49 / hr50 - 249
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See all 22 projectsInclusion Cloud is a Mobile App Development company specializing in iOS and Android Development. They have received overwhelmingly positive feedback, with clients praising their reliability, cost-effectiveness, and user-centric mobile applications. Their projects, such as the one for Sympla, are noted for their high-tech approach and agile project management, leading to 5-star app store ratings.
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$10,000+$25 - $49 / hr10 - 49Kyiv, Ukraine
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See all 4 projectsSmartBox Software is a mobile app development company specializing in creating innovative and dependable smartphone applications for iOS and Android platforms. They receive positive feedback for their professional and collaborative approach, with 100% of reviewers highlighting their capacity to deliver unique and effective app solutions. Additionally, clients praise their high motivation and successful project outcomes.
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$1,000+< $25 / hr2 - 9Melville, NY
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See all 4 projectsQualDev Inc. is a multifaceted web development firm specializing in creating robust e-commerce solutions and managing complex backend and frontend integrations. Across numerous reviews, clients praised their exceptional responsiveness and problem-solving capabilities, with 100% expressing satisfaction. Notably, 75% highlighted their competitive pricing and 50% emphasized their ability to handle complex customizations. QualDev's ongoing support and innovative solutions have been pivotal in enhancing businesses' digital performance and growth.
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$25,000+$50 - $99 / hr250 - 999
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See all 3 projectsiLogos Game Studios is a mobile app development company specializing in mobile software development and game asset production. Reviews highlight their high-quality 2D assets, seamless integration, and exceptional project management. With 100% positive feedback, clients commend their adaptability, communication, and ability to meet timelines while enhancing project concepts.
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$1,000+$25 - $49 / hr10 - 49Kharkiv, Ukraine
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See all 11 projectsStellum is a Mobile App Development company specializing in iOS and Android applications with a focus on React Native technology. Reviews highlight their expertise in improving code quality and delivering user-friendly applications, with 100% of clients noting their strong project management and commitment to high-quality outcomes. Their ability to transform poorly written code and execute complex projects efficiently is frequently praised.
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$25,000+Undisclosed10 - 49Boston, MA
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See all 12 projectsEchobind is a Mobile App Development company specializing in iOS and Android Development. They are praised for their technical expertise and effective project management, with 100% of reviewers appreciating their strong communication and ability to resolve complex issues. Clients noted Echobind's smooth handling of challenging projects and their pleasant, cooperative work style.
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$5,000+$50 - $99 / hr2 - 9Nova gorica, Slovenia
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See all 1 projectsCreative Solutions is a VR development company that excels in creating educational VR games. They are praised for their effective communication, flexibility, and creativity, delivering projects on time. With 100% positive feedback, clients appreciate their proactive approach and ability to build trust, leading to successful project outcomes and potential for future collaborations.
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$5,000+$50 - $99 / hr10 - 49Warszawa, Poland
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See all 1 projectsAltence is a Mobile App Development company specializing in React Native, offering expertise in both iOS and Android Development. Reviews highlight their exceptional project management and deep technical understanding, with 100% positive feedback emphasizing timely delivery and high-quality code. Clients appreciate their effective communication and proactive approach in suggesting technical solutions.
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$1,000+< $25 / hr10 - 49Sahibzada Ajit Singh Nagar, India
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See all 4 projectsDevex Hub is a Mobile App Development company specializing in Android Development. The overall feedback from reviews is overwhelmingly positive, with 100% of reviewers praising their professionalism, attention to detail, and timely delivery. Clients particularly appreciate their project management and commitment to customer satisfaction, making Devex Hub a highly recommended choice for mobile software engineering projects.
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$10,000+$50 - $99 / hr10 - 49Valencia, Spain
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See all 12 projectsYeeply is a Mobile App Development company that excels in creating iOS and Android applications, with strong capabilities in managing and executing projects efficiently. A significant 85% of reviews highlight their professionalism, responsiveness, and solution-oriented approach, although some mention occasional billing issues or project delays. Overall, Yeeply is praised for its quality deliverables and effective communication, fostering long-term client relationships.
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$5,000+$25 - $49 / hr50 - 249Bengaluru, India
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See all 1 projectsThinkJS is a Mobile App Development company known for delivering projects on time and maintaining strong communication with clients. Approximately 100% of the reviewers highlight their quick adaptability to new challenges and consistent responsiveness. Their ability to develop mobile applications from scratch makes them a reliable choice for Edtech projects.
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$1,000+< $25 / hr250 - 999Mumbai, India
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See all 39 projectsNimap Infotech is a Mobile App Development company noted for its strategic thinking, technical expertise, and commitment to client needs. In reviews, 100% of clients praised their ability to deliver tailored solutions on time, with 50% highlighting their exceptional communication and problem-solving skills. Their work fosters positive outcomes, aligning with clients' business objectives.
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$5,000+$25 - $49 / hr50 - 249Sahibzada Ajit Singh Nagar, India
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See all 10 projectsWebGarh Solutions is a versatile web development company, known for providing custom solutions across various platforms, including Shopify and Prestashop. They have received predominantly positive feedback for their professional communication, timely delivery, and ability to adapt to client needs, with over 85% of reviewers praising their responsiveness and high-quality work. While some areas for improvement were noted, most clients highlighted their effectiveness in project execution.
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$1,000+$50 - $99 / hr2 - 9Kyiv, Ukraine
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See all 2 projectsPurrcode Solutions is a web development company specializing in node.js, with capabilities extending to PHP projects. Reviews highlight their responsiveness, quality focus, and successful project delivery, with 100% of reviewers expressing satisfaction and recommending them for collaboration. Their approach is praised for treating clients' projects as their own, ensuring high-quality outcomes.
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$5,000+$25 - $49 / hr10 - 49
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See all 3 projectsTimebase is a Mobile App Development company known for developing web and mobile applications, primarily for fintech solutions. They receive overwhelmingly positive feedback, with 100% of reviewers highlighting their accommodating nature, effective communication, and alignment with client vision. The company is praised for on-time, high-quality delivery and good value for cost.
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$5,000+$50 - $99 / hr10 - 49Lahore, Pakistan
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See all 4 projectsYTeams Pvt Ltd is a software development company specializing in React JS with a team known for their advanced use of frameworks and scrum methodologies. The feedback highlights their skilled JavaScript developers and impressive productivity, with 100% of the reviews noting their responsiveness and ability to deliver powerful outcomes.
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$5,000+$25 - $49 / hr50 - 249Wrocław, Poland
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See all 7 projectsAltimi is a Mobile App Development company specializing in Android application development and maintenance. The company is praised for its proactive project management, flexibility, and expertise, with approximately 100% of reviewers highlighting its structured approach and expertise. However, there is occasional feedback about long lead times before project initiation.
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$1,000+$100 - $149 / hr10 - 49Stockholm, Sweden
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See all 1 projectsShortcut is a Mobile App Development company that excels in iOS Development. Clients consistently praise their dedication and project management skills, with 100% of reviewers noting their hard work and problem-solving abilities. The company is lauded for its impact on user engagement, reflected in substantial growth in app users without marketing efforts.
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$10,000+$50 - $99 / hr10 - 49Dnipro, Ukraine
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See all 5 projectsD Coast Studio is a versatile design and development agency known for its high-quality UX design, website development, and marketing solutions. Client feedback highlights the company's prompt communication, collaborative attitude, and ability to meet tight deadlines. Approximately 75% of reviews emphasize their exceptional responsiveness and project management skills, with clients expressing satisfaction in achieving desired outcomes efficiently.
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$10,000+$50 - $99 / hr10 - 49Kfar Netter, Israel
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See all 3 projectsAppniv is a versatile software development company specializing in web and mobile applications, utilizing technologies such as Angular, Java, and C#. The company receives overwhelmingly positive feedback, with clients praising their flexibility, innovation, and commitment to meeting milestones. About 33% of reviews mention effective communication, while 67% highlight their ability to manage expectations and deliver quality results. Some feedback notes challenges with time zone differences and staff turnover.
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$1,000+$25 - $49 / hr50 - 249Indore, India
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See all 5 projectsCarina Softlabs Inc. is a development company offering services in mobile app development, game development, and website design. Feedback is mixed, with 50% of reviews highlighting issues like unoptimized code and poor communication, while the other 50% praise their ability to deliver quality prototypes efficiently. Clients suggest technical audits to ensure project quality.
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$1,000+< $25 / hr10 - 49Lagos, Nigeria
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See all 4 projectsTechhive Technologies is a proficient web development company that offers comprehensive services, including website creation, e-commerce solutions, and SEO integration. The company receives overwhelmingly positive feedback, with 100% of reviewers highlighting their attentiveness to client needs and effective project management. Clients report significant improvements in online visibility and engagement, attributing a substantial increase in inquiries and sales to Techhive's work.
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$5,000+< $25 / hr50 - 249
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See all 12 projectsNavyug Infosolutions is a Mobile App Development company specializing in creating custom Android and iOS applications. Across multiple reviews, clients have praised their technical competence and proactive approach to project management, resulting in high satisfaction rates. Approximately 90% of reviewers reported positive experiences, highlighting Navyug’s ability to meet project timelines and solve complex technical challenges effectively.
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$10,000+$25 - $49 / hr50 - 249
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See all 3 projectsSISGAIN is a Mobile App Development company specializing in healthcare solutions, delivering high-quality and customized applications. Their services have garnered positive feedback, with approximately 100% of reviews highlighting their professionalism, effective communication, and timely delivery. Many clients commend their expertise in creating innovative healthcare applications, emphasizing their dedication and focus on meeting project requirements.
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List of the Top 15 Cross Platform Application Development Companies
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$25,000+$25 - $49 / hr50 - 249Agoura Hills, CA
Ability to deliver
39.9/40.020/20 Reviews10/10 Clients & Experience9.9/10 Market PresenceService focus
50% Mobile App Development50% Hybrid & cross platform apps50% Other -
$5,000+$25 - $49 / hr250 - 999Jaipur, India
Ability to deliver
39.9/40.020/20 Reviews10/10 Clients & Experience9.9/10 Market PresenceService focus
60% Mobile App Development60% Hybrid & cross platform apps40% Other -
$10,000+$50 - $99 / hr250 - 999Greenville, SC
Ability to deliver
39.9/40.020/20 Reviews10/10 Clients & Experience9.9/10 Market PresenceService focus
60% Mobile App Development55% Hybrid & cross platform apps40% Other -
$10,000+$25 - $49 / hr50 - 249Warszawa, Poland
Ability to deliver
39.7/40.020/20 Reviews10/10 Clients & Experience9.7/10 Market PresenceService focus
55% Mobile App Development50% Hybrid & cross platform apps45% Other -
$25,000+$50 - $99 / hr50 - 249Rzeszów, Poland
Ability to deliver
39.6/40.020/20 Reviews10/10 Clients & Experience9.6/10 Market PresenceService focus
50% Mobile App Development50% Hybrid & cross platform apps50% Other -
$25,000+$50 - $99 / hr50 - 249Warszawa, Poland
Ability to deliver
39.6/40.020/20 Reviews10/10 Clients & Experience9.6/10 Market PresenceService focus
80% Mobile App Development100% Hybrid & cross platform apps20% Other -
$25,000+$50 - $99 / hr50 - 249Hollywood, FL
Ability to deliver
39.5/40.020/20 Reviews10/10 Clients & Experience9.5/10 Market PresenceService focus
60% Mobile App Development50% Hybrid & cross platform apps40% Other -
$10,000+$50 - $99 / hr50 - 249Montevideo, Uruguay
Ability to deliver
39.3/40.020/20 Reviews10/10 Clients & Experience9.3/10 Market PresenceService focus
75% Mobile App Development80% Hybrid & cross platform apps25% Other -
$25,000+$50 - $99 / hr50 - 249Buenos Aires, Argentina
Ability to deliver
38.9/40.019.2/20 Reviews10/10 Clients & Experience9.7/10 Market PresenceService focus
50% Mobile App Development60% Hybrid & cross platform apps50% Other -
$25,000+$25 - $49 / hr250 - 999Irving, TX
Ability to deliver
39.9/40.020/20 Reviews10/10 Clients & Experience9.9/10 Market PresenceService focus
30% Mobile App Development30% Hybrid & cross platform apps70% Other -
$25,000+< $25 / hr250 - 999Gurugram, India
Ability to deliver
39.7/40.020/20 Reviews10/10 Clients & Experience9.7/10 Market PresenceService focus
30% Mobile App Development30% Hybrid & cross platform apps70% Other -
$5,000+< $25 / hr50 - 249Jaipur, India
Ability to deliver
39.8/40.020/20 Reviews10/10 Clients & Experience9.8/10 Market PresenceService focus
50% Mobile App Development40% Hybrid & cross platform apps50% Other -
$5,000+$25 - $49 / hr250 - 999Surry Hills, Australia
Ability to deliver
40/40.020/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
50% Mobile App Development25% Hybrid & cross platform apps50% Other -
$10,000+$25 - $49 / hr250 - 999Kolkata, India
Ability to deliver
39/40.020/20 Reviews9.8/10 Clients & Experience9.2/10 Market PresenceService focus
30% Mobile App Development35% Hybrid & cross platform apps70% Other -
$10,000+$25 - $49 / hr250 - 999San Francisco, CA
Ability to deliver
39.9/40.020/20 Reviews10/10 Clients & Experience9.9/10 Market PresenceService focus
25% Mobile App Development80% Hybrid & cross platform apps75% Other -
$10,000+$25 - $49 / hr50 - 249Indore, India
Ability to deliver
38.3/40.018.8/20 Reviews10/10 Clients & Experience9.5/10 Market PresenceService focus
50% Mobile App Development50% Hybrid & cross platform apps50% Other -
$10,000+$50 - $99 / hr50 - 249Ząbki, Poland
Ability to deliver
37.9/40.020/20 Reviews9.3/10 Clients & Experience8.7/10 Market PresenceService focus
75% Mobile App Development100% Hybrid & cross platform apps25% Other -
$1,000+< $25 / hr50 - 249Kolkata, India
Ability to deliver
37.9/40.018.6/20 Reviews10/10 Clients & Experience9.3/10 Market PresenceService focus
50% Mobile App Development50% Hybrid & cross platform apps50% Other -
Undisclosed$25 - $49 / hr250 - 999Dubai, United Arab Emirates
Ability to deliver
38.1/40.018.4/20 Reviews10/10 Clients & Experience9.7/10 Market PresenceService focus
40% Mobile App Development30% Hybrid & cross platform apps60% Other -
$10,000+$25 - $49 / hr250 - 999San Francisco, CA
Ability to deliver
40/40.020/20 Reviews10/10 Clients & Experience10/10 Market PresenceService focus
50% Mobile App Development20% Hybrid & cross platform apps50% Other -
$25,000+$50 - $99 / hr1,000 - 9,999Gliwice, Poland
Ability to deliver
38.5/40.018.8/20 Reviews10/10 Clients & Experience9.7/10 Market PresenceService focus
20% Mobile App Development30% Hybrid & cross platform apps80% Other -
$50,000+$100 - $149 / hr10 - 49London, England
Ability to deliver
37.2/40.018/20 Reviews10/10 Clients & Experience9.2/10 Market PresenceService focus
70% Mobile App Development70% Hybrid & cross platform apps30% Other -
$10,000+$50 - $99 / hr50 - 249Denver, CO
Ability to deliver
39.7/40.020/20 Reviews10/10 Clients & Experience9.7/10 Market PresenceService focus
60% Mobile App Development30% Hybrid & cross platform apps40% Other -
$5,000+< $25 / hr50 - 249Indore, India
Ability to deliver
38.4/40.020/20 Reviews8.8/10 Clients & Experience9.6/10 Market PresenceService focus
55% Mobile App Development40% Hybrid & cross platform apps45% Other -
$25,000+$25 - $49 / hr50 - 249Miami, FL
Ability to deliver
36.9/40.017.6/20 Reviews10/10 Clients & Experience9.3/10 Market PresenceService focus
60% Mobile App Development50% Hybrid & cross platform apps40% Other -
$10,000+$50 - $99 / hr50 - 249Montevideo, Uruguay
Ability to deliver
39.5/40.020/20 Reviews10/10 Clients & Experience9.5/10 Market PresenceService focus
30% Mobile App Development60% Hybrid & cross platform apps70% Other -
$5,000+$25 - $49 / hr50 - 249Jaipur, India
Ability to deliver
38.8/40.019.2/20 Reviews10/10 Clients & Experience9.6/10 Market PresenceService focus
50% Mobile App Development35% Hybrid & cross platform apps50% Other -
$50,000+$150 - $199 / hr10 - 49Chicago, IL
Ability to deliver
36.7/40.017.4/20 Reviews10/10 Clients & Experience9.3/10 Market PresenceService focus
60% Mobile App Development60% Hybrid & cross platform apps40% Other -
$10,000+$150 - $199 / hr10 - 49Halifax, Canada
Ability to deliver
38.9/40.020/20 Reviews9/10 Clients & Experience9.9/10 Market PresenceService focus
40% Mobile App Development70% Hybrid & cross platform apps60% Other -
$5,000+$25 - $49 / hr1,000 - 9,999Noida, India
Ability to deliver
36.7/40.019.6/20 Reviews10/10 Clients & Experience7.1/10 Market PresenceService focus
30% Mobile App Development25% Hybrid & cross platform apps70% Other
Latest Cross Platform Articles
See all articles
Mobile App Strategy: Brands Leading the Way in User Engagement, Retention & Performance
Learn what makes a winning mobile app strategy. See how brands like Starbucks, Nike, and Duolingo drive engagement, retention, and performance.
Cross-Platform App Development Agency FAQs
Leading agencies track key performance indicators such as install rate, user retention, session length, and revenue per user. They integrate analytics tools like Firebase, Mixpanel, or Amplitude to monitor these metrics and run A/B tests, allowing stakeholders to tie feature releases directly to business outcomes.
A cross-platform app development company designs, builds, tests, and maintains mobile applications that run smoothly on multiple operating systems—usually iOS and Android—with a single shared codebase. By leveraging frameworks such as Flutter, React Native, Xamarin, or Kotlin Multiplatform, these firms streamline development timelines, reduce maintenance overhead, and ensure a consistent user experience across devices. They also advise on app store compliance, security, and performance optimization.
Cross-platform app development companies tailor their services to help clients accomplish their unique goals and launch sophisticated apps. By partnering with these service providers, you can expect services such as:
- Technical consulting and product discovery
- UI/UX design tailored for multi-device compatibility
- Shared-codebase development (i.e., Flutter, React Native)
- Native module integration for device-specific features
- API and backend development or integration
- Quality assurance, automated testing, and CI/CD
- Post-launch support, updates, and mobile app development services such as analytics implementation and feature road-mapping
Budgets range widely based on several variables such as project complexity, feature set, and team size. Here’s a run through of average pricing based on cross-platform app development projects reviewed on Clutch:
- MVP or prototype: $25,000 – $60,000
- Mid-range consumer app: $60,000 – $150,000
- Enterprise-grade solution with integrations: $150,000 – $500,000+
Hourly rates for these service providers typically fall between $50 – $149. In addition, offshore teams often charge less, while top-tier U.S. agencies may exceed $200 per hour. Always request a detailed scope, delivery milestones, and maintenance costs up front.
- Match technical expertise to your stack (e.g., Flutter vs. React Native).
- Review case studies for similar industries or app types.
- Validate client testimonials and Clutch ratings.
- Assess communication style and project management tools.
- Compare total cost of ownership—including post-launch support—rather than just initial quotes.
Before committing to a long-term partnership, consider doing a trial run or a short test project. A discovery workshop or paid proof of concept is a low-risk way to evaluate fit before committing to a full build.
- Guarantees of unrealistically low budgets or launch dates
- Vague contracts without source-code ownership clauses
- Limited portfolio in cross platform mobile programming
- Poor responsiveness during the sales cycle
- Overreliance on generic templates instead of custom architecture
If a provider can’t explain their quality-assurance process or refuses to give you repository access, keep looking. Taking your time and being meticulous is better than wasting time, effort, and resources with the wrong partner.
- Which frameworks and programming languages do you specialize in?
- How do you handle OS-specific features within a shared codebase?
- What is your approach to testing on real devices versus emulators?
- Will I own the source code and IP upon project completion?
- How do you structure post-launch maintenance and updates?
- Can you provide references for projects similar in scope and industry?
Cross-platform teams deliver faster time-to-market and up to 30–40% cost savings because a single codebase powers multiple platforms. This unified approach simplifies future updates, ensures design consistency, and reduces the need for duplicate QA cycles. Native teams may still be preferable for GPU-intensive gaming or highly platform-specific experiences, but most business, productivity, and e-commerce apps see greater ROI with a cross-platform strategy.