Top 60 Cross Platform App Developers in Seattle
The Best of December 2025Looking for a top cross platform mobile app development company in Seattle?
Cross-platform mobile applications have benefits that outweigh those of native applications if your users interact with your business on both Android and Apple products. Cross platform app development entails building a mobile app that’s compatible with multiple operating systems. Cross-platform, or hybrid apps, use a single codebase, which means you don’t need separate apps with separate technologies to appeal to customers using Android or iOS. Because of this single codebase, cross platform apps are less costly to create and maintain.
Most hybrid apps will use either Ionic or React as a development framework. React is a JavaScript framework that allow apps to support Android and iOS natively, while Ionic uses JavaScript, HTML5, CSS, and Sass for hybrid apps, desktop apps, and progressive web apps. Choosing an app developer with the right skillset to fit the technology framework your app needs is a good place to start when interviewing app development companies.
To assist you in your search for a partner, we’ve compiled this list of the top cross platform app developers in Seattle. Browse descriptions, feedback, and awards to find which can best suit your company’s needs.
List of the Best Seattle Cross Platform Mobile App Development Companies
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31$75,000+50 - 249 employeesSeattle, WATangoTeams, a midsize website development company, is in Seattle, Washington. Their services include Web Development and Mobile App Development.Read More
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32$1,000+10 - 49 employeesLynnwood, WATechlusion LLC is a cloud consulting & SI company. Their small team is in Lynnwood, Washington and Ahmedabad, India. Their services include cloud consulting & SI and IT staff augmentation.Read More
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33$1,000+10 - 49 employeesRedmond, WAWebtual Global Inc., a custom software development company, was founded in 2019. The company offers Custom Software Development and Enterprise App Modernization.Read More
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34Undisclosed10 - 49 employeesMountlake Terrace, WASunshine Digital Solutions is a SEO company. The Mountlake Terrace, Washington-based company was founded in 2024. Their services include Search Engine Optimization and Pay Per Click.Read More
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35$1,000+2 - 9 employeesSeattle, WAQamera Design is an UX design agency founded in 2016. The small team specializes in UX/UI Design and Mobile App Development.Read More
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36$50,000+50 - 249 employeesSeattle, WACloud consulting & SI company GenUI was launched in 2009. The midsize team focuses on cloud consulting & SI and Mobile App Development.Read More
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37Undisclosed50 - 249 employeesLynnwood, WAEstablished in 1994, TransAct Communications, LLC is a custom software development company. The agency focuses on Custom Software Development and Translation.Read More
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38$5,000+10 - 49 employeesKirkland, WAFacet Digital, LLC is a website development firm founded in 2013. The small team offers Web Development and Mobile App Development.Read More
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39$25,000+10 - 49 employeesSeattle, WAElite Crest Technologies is a small AI firm established in 2011. Their team offers Artificial Intelligence and IoT development.Read More
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40$5,000+2 - 9 employeesSeattle, WAV37 is a custom software development company located in Seattle, Washington. Launched in 2022, the team specializes in Custom Software Development and Web Development.Read More
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41Undisclosed50 - 249 employeesKirkland, WAAltaSource Group is a mobile application development company established in 2009. The midsize team focuses on Mobile App Development and Web Design.Read More
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42Undisclosed2 - 9 employeesSeattle, WARead More
Ministry of Product is a web development company that was founded in 2005 and is headquartered in Seattle. Their team of 3 employees specializes in mobile app development, web development, and UX/UI design. They mostly work with companies in the business services, entertainment, and consumer products industries.
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ZulilyIndustries
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43$10,000+2 - 9 employeesBellevue, WAAstra, a web development company, offer Web Development and Mobile App Development. They were established in 2022.Read More
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44$5,000+2 - 9 employeesSeattle, WARead More
Founded in 2003, Swecker is a Seattle-based web development agency that serves small and mid-market businesses. In addition to web development, the team of fewer than 10 also offers mobile app and custom software development and design.
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MicrosoftIndustries
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45$1,000+50 - 249 employeesBellevue, WATechValens Software Systems LLC is an application development company. The firm is located in Bellevue, Washington. Their services include Mobile App Development and Web Development.Read More
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46Undisclosed250 - 999 employeesSeattle, WARead More
Projekt202 is a software development and marketing company based in Addison, Texas. They were founded in 2003 and have a team of 285 employees. They specialize in custom software development, UX/UI design, and mobile app development to improve their client’s customer and employee experiences.
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VontoIndustries
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47Undisclosed2 - 9 employeesSeattle, WAFounded in 2016, App Development Seattle is an application development firm. The team provides Mobile App Development and Web Design.Read More
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48Undisclosed10 - 49 employeesSeattle, WALaunched in 2017, Diatomic Product Development is a Product Design company. The company focuses on Product Design and Custom Software Development.Read More
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49$1,000+2 - 9 employeesTacoma, WARead More
Grinev Software is a development company based in Federal Way, Wash. Their team was founded in 2007 and has around 10 employees. They primarily provide mobile app, web, and e-commerce development.
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grinev.softwareIndustries
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50UndisclosedFreelancer employeesEverett, WAMystic Engineering / Mystic Industries is a small Product Design company located in Everett, Washington. Their services include Product Design and Custom Software Development.Read More
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51$5,000+2 - 9 employeesBothell, WARavenna is a website development company headquartered in Bothell, Washington. The team offers Web Development and Mobile App Development.Read More
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52Undisclosed2 - 9 employeesSeattle, WANirvana US, a small e-commerce development company, is headquartered in Seattle, Washington. Their services include E-Commerce Development and Mobile App Development.Read More
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53Undisclosed2 - 9 employeesBothell, WANeoSwift Technologies is a Bothell, Washington-based cloud consulting & SI company. They offer cloud consulting & SI and Web Development and were launched in 2020.Read More
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54$5,000+2 - 9 employeesBothell, WAHeadquartered in Bothell, Washington, Tekies Data Solution is a small social media marketing firm. The team specializes in Social Media Marketing and Search Engine Optimization.Read More
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