Top 40 Cross Platform App Developers in Seattle

Zazz is a Seattle-based mobile app development company founded in 2011. They have an additional office in San Francisco. Their team of approximately 50 employees serves clients of all sizes and industries. In addition to app development, they also specialize in enterprise app modernization and UX/UI design.

ThirstySprout is an outsourced development company headquartered in Seattle with an additional office in San Franciso. Founded in 2017, they currently have about 18 employees. They provide IT staff augmentation as well as custom software and web development services to primarily midmarket agencies in IT, e-commerce, and business services.

AccelOne is a software development company based in Kirkland, Wash. with offices in Buenos Aires, Argentina. Founded in 2013, AccelOne's team of 25 employees provides custom software development, mobile app development, and UX/UI design services.

A full-service digital design and development agency, Flower Press Creative Studio takes on mobile app, web, and custom software development projects. Founded in 2001, the small team of 6 is headquartered in Seattle and also has experience in UI/UX design.

UPQODE is a website design and development agency based in Nashville, Tennessee. Founded in 2015, the team of 40+ specializes in web development, web design, and e-commerce development. They work with small businesses, focusing on information technology, e-commerce, and business services.

Matellio is a mobile and web app development company founded in 2012. Headquartered in San Jose, Calif., Matellio's team of around 40 specialize in web and mobile app development.Although Matellio encountered unexpected challenges that led to minor delays, the client appreciated their clear communication.

Founded in 2000, Blink UX has almost 20 years of experience in the IT sector. True to their name, Blink UX specializes in UX/UI design but also offers mobile and web development, research, strategy, and design services.

Slashdev is a small software development company. The Winter Park, Florida-based company was established in 2021. Their services include custom software development, web development, mobile app development, wearable app development, and more.

Mobcoder is a software development company based in Seattle. They also have an office in Noida, India. Founded in 2014, their team of 40 employees provides mobile app development, custom software, and web development services to its midmarket and small business clients. They also serve enterprise clients. 

Founded in 2000, UpTop specializes in UI/UX design but also shines in web and mobile app development. Their team of 50+ are passionate about solving complex problems and increasing revenue for their clients.

Montana Banana’s skill in full-service web and mobile app development has yielded results for clients since 1996. In addition to an office in Seattle, WA, the team of 5 also has a presence in Pasadena, CA. The development company stands out in web, mobile app development, and e-commerce development, as well as design.

Smashing Ideas is a mobile app development company that offers an array of services such as UI/UX design, web design, data strategy and analytics, and quality assurance and testing. Since its founding in 1996, Smashing Ideas has grown to over 50 employees who are passionate, curious, and creative.

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. 

New Normal, founded in 2012, is a software services agency headquartered in Seattle. Their company consists of a team of 22 people who specialize in web development, mobile app development, and e-commerce development. While they mostly work with mid-market businesses, they also work with enterprise and small businesses. The businesses they work with are mostly in the advertising & marketing, e-commerce, and financial services industries.
 

Founded in 2014, PYCOGroup is a development firm. Their team of around 370 employees is based in Brussels, with an additional office around the globe. They focus on custom software, web, and mobile app development.

Scalex Technology Solutions is a digital agency founded in Bellevue, Wash. in 2015 with fewer than 50 employees. They specialize in cloud consulting, mobile app development, and custom software development for clients in the fields of education, financial, and IT services.

Founded in 2017, Fenyx Studio is an application development company. The firm provides mobile app development, web development, and custom software development and has a small team. The firm is in Santa Monica, California and Seattle, Washington.

Based in Kirkland, Wash., ITIRRA is a boutique technology consulting firm. Since 2008, their team of 12 has been specializing in web development, mobile app development, IT strategy consulting, and more. 

Helpful Human is a development agency based in Seattle. Since 2013, their team of 15 has been specializing in web design and development, mobile app development, and UX/UI design. They work primarily with small businesses in the information services and business services industries.

Founded in 2017, Valere Labs is a custom software development firm. Located in Shrewsbury, Massachusetts, their small team focuses on custom software development, mobile app development, web development, Artificial Intelligence, and more.

9series Inc. is a technology solutions firm based in Ahmedabad, India, focusing on US and European clients. They have more than 100 employees and have been offering web development, mobile app development, and custom software development since 2007. They specialize in small and midmarket clients in the business services, IT, and education industries.

Established in 2005, Palador is a custom software development firm. Based in Seattle, Washington and Yogyakarta, Indonesia, their small team offers custom software development, enterprise app modernization, ux/ui design, web development, and more.

Launched in 1998, Sandcastle Web Design and Development is a small web design agency based in Seattle, Washington. Their services include web design, custom software development, e-commerce development, and mobile app development.

Groove Jones is a mobile app, AR/VR, and custom software developer based in Dallas. Founded in 2015, this 10+ team of digital experts builds the interactive tools that give brands a competitive edge.

Headquartered in Miami Beach, Florida; Yerevan, Armenia and Bellevue, Washington, Innova is a software development firm. The small firm was launched in 2021. Their team focuses on custom software development, web development, mobile app development, other application development, and more.

Carbon Five is a software development firm. Established in 2000, the midsize company is located in San Francisco, California; Santa Monica, California; Chattanooga, Tennessee and New York, New York. Their services include custom software development, mobile app development, web development, web design, and more.

Located in Kirkland, Washington, AltaSource Group is a mobile app development firm. The midsize company was founded in 2009. Their team focuses on mobile app development, web design, web development, and IT staff augmentation.

TangoTeams is an app development company. Established in 2021, the team provides mobile app development, web development, custom software development, and other application development. Their midsize firm is Seattle, Washington-based.

Devblock is a software development company. The midsize Seattle, Washington-based company was founded in 2008. Their team focuses on custom software development, mobile app development, web development, e-commerce development, and 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.