The 10 Best Cross Platform Development Firms in California - 2025 Reviews

Top Cross Platform Development Firms in California

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Unlock the power of multi-platform reach with California's premier Cross Platform Development agencies. Our curated list showcases top-tier firms specializing in creating seamless applications that work flawlessly across various devices and operating systems. Explore each agency's portfolio and client testimonials to find the perfect match for your project needs. Whether you're looking to develop a hybrid mobile app, a responsive web application, or a universal desktop solution, these expert teams have the skills to bring your vision to life. With Sortlist, you can easily post your project requirements, allowing California's best Cross Platform Development firms to reach out with tailored proposals that align with your business goals and technical specifications.

Top Featured Cross Platform Development Firms

All Cross Platform Development Agencies in California

  • (0 review)

    Inwizards: Leading Software Development Company

    Inwizards Software Technology is a leading US-based software development company that assists businesses to adopt digital transformation and acquire immense success. We specialize in offering a wide range of services, including IT consulting, Custom Software Development, Digital Marketing, SEO, Product Development, Mobile App Development and many more. We aim to deliver the finest on the table infused with innovative technologies. Our presence for more than one and a half-decade with a vast network and expertise is what sets us apart as a website and application development company. Our veteran team of experts handpick software solutions and ensure a long-term competitive edge. Inwizards offer a number of clientele software technologies from WordPress, Flutter, IOT, AngularJs, Blazor Development, Blockchain, PHP, Full Stack Development, ReactJs, NodeJs, Web Development, E-commerce Web Development, Android App Development, iOS App Development, Xamarin Development, etc.
    Looking for work in Cross Platform Development
    Unknown location
    Budget on request
    Worked in Music (+7)
    Speaks English
    51-200 members
  • (0 review)

    Empowering Businesses with Custom Software Development Services

    At InfoGrains, we're a team of 200+ skilled professionals, delivering cutting-edge solutions in: - Blockchain Development - Custom Software Development - IT Consulting Services - Artificial Intelligence (AI) - Internet of Things (IoT) - Machine Learning (ML) - Data Analytics - Digital Marketing - Enterprise Software Solutions - Mobile App Development - Web Development With a strong focus on customer satisfaction, we've delivered tailored solutions to clients across various industries, including Employee Benefits, Healthcare, E-commerce, and more. Our team includes distinguished professionals with industry expertise, ensuring we deliver high-quality solutions that drive business growth.
    Looking for work in Cross Platform Development
    Unknown location
    Budget on request
    Worked in Clothing & Accessories (+3)
    Speaks English, Hindi
    201-500 members
  • 5
    (11 reviews)

    Excellence Through Technology and Partnership Since 2008

    Highly recommended
    Top awarded
    LOOKING FOR A DEVELOPMENT PARTNER WHO VALUES LONG-TERM COLLABORATION OVER SHORT-TERM VENDOR RELATIONSHIPS? Our Clients have successfully validated their MVP's and received funding from prestigious industry leaders such as Google, A16Z, Dreamit Ventures, Bunat Ventures and many more. At NMG, we offer extensive technical expertise in developing Mobile Apps (both Native, React/ Flutter), Custom Web, Software Development (using PHP, Python, .NET, JAVA), AI/ML applications, E-commerce solutions, and Advanced Search Marketing solutions that are robust, scalable, and of world-class quality. With over 15 years of experience, we have served a diverse range of clients, from NASDAQ-listed companies to tech startups. Certified Partners: Microsoft GOLD Partner, Google Partner, Amazon Web Services and Pubnub. Completely transparent development process which even a non technical person can easily understand. We collaborate with clients in the following manners: 1. Fixed Price - This option is suitable for relatively small and short projects with well-defined requirements. 2. T&M - This option is ideal for medium to large, lengthy projects that require a high degree of requirement flexibility. 3. Staff Augmentation - With this option, you can hire developers to work remotely with you as an extension of your team. Free consultation and "Best Practices Guide" Web and Software Development: https://growth.nmgtechnologies.com/clutch/web-development Mobile App: https://growth.nmgtechnologies.com/clutch/mobile-application-development
    Looking for work in Cross Platform Development
    Located in Gurugram, India (+1)
    From €1,000 for Cross Platform Development
    Worked in Human Resources (+10)
    Speaks English
    51-200 members
  • 4.9
    (117 reviews)

    Grow Big, Grow Right.

    Highly recommended
    Top awarded
    Chez RHILLANE Marketing Digital, nous ne faisons pas que promouvoir votre marque : nous révélons tout son potentiel. En tant qu'agence de marketing digital 360°, nous avons accompagné plus de 615 clients à travers le monde, généré +50 millions de dollars de chiffre d’affaires pour nos clients, et géré +15 millions de dollars en budgets publicitaires. Avec des bureaux à la fois au Maroc et en Californie, aux États-Unis, nous sommes fiers de servir une clientèle internationale en apportant des solutions personnalisées et performantes. Des résultats qui parlent d’eux-mêmes. Avec 280 clients Meta Ads, +80% de nos campagnes affichant un ROAS supérieur à 7, et un taux de satisfaction de 96%, nous transformons les ambitions de nos clients en succès mesurables. Nos services vont de la création de sites web élégants et intuitifs, au SEO qui propulse vos classements, en passant par des campagnes publicitaires Meta, Google, et TikTok ultra-ciblées. Chaque stratégie est conçue pour capter l’attention, générer des conversions, et fidéliser vos clients. RHILLANE Marketing Digital est bien plus qu’une agence digitale : nous sommes votre partenaire de croissance. Grâce à nos outils de pointe, notre créativité audacieuse et une expertise ancrée dans les données, nous accompagnons nos clients pour surmonter leurs concurrents et atteindre des sommets. Rejoignez les entreprises qui ont déjà transformé leur présence en ligne avec nous. Votre succès commence ici.
    Looking for work in Cross Platform Development
    Located in Torrance, United States (+2)
    From €1,000 for Cross Platform Development
    Worked in Legal Services (+18)
    Speaks English, Arabic(+2)
    11-50 members
  • 5
    (9 reviews)

    On Time ... On Budget ... Solutions Exceeding Expectation

    Recommended
    Top awarded
    Dot Com Development is a 🤝trusted🤝 and 🏆awarded🏆design and development technology company providing custom solutions for companies of all sizes and industries. We provide end to end application planning, design, development, testing and support services with expertise in the latest cutting edge, high performing, and future proof technologies. We’ll get your digital product to market 30% faster than our competitors, improve development costs by up to 40% and create user experiences that get 5x-10x more user engagement. Our services include: ✅ Strategic Planning and Consulting ✅ UX/UI Design ✅ Prototyping and POC's ✅ Web Application Development ✅ Website Design and Development ✅ Mobile Application Development ✅ eCommerce Development ✅ API Development and Integration ✅ Data and Analytics ✅ Cloud Development ✅ CRM / ERP Development ✅ Artificial Intelligence Development ✅ DevOps / Cloud Services ✅ Support and Maintenance
    Looking for work in Cross Platform Development
    Located in Scottsdale, United States
    From €5,000 for Cross Platform Development
    Worked in Industrial Goods & Services (+11)
    Speaks English
    11-50 members
  • 5
    (14 reviews)

    Elite Product Dev/Design Agency scaling startups with battle-tested UX, AI, & strategic innovation

    Highly recommended
    Top awarded
    DesignX partners with ambitious startups and enterprise brands to scale through strategic design. Our elite US-based team, drawn from the top 1% of design talent, has helped scale companies from seed to unicorn status and transformed Fortune 500 digital products. Working directly with founders and product leaders, we combine deep UX/UI expertise, AI-powered innovation, and battle-tested strategies to drive measurable business outcomes. From Bodybuilding.com's growth to $500M+ revenue to mission-critical platforms for Nike and Apple, our talent has delivered results through intelligent design. Our services span product strategy, UX/UI design, development, and optimization – creating seamless digital experiences that convert users and accelerate growth. While others focus on surface-level aesthetics, we align design with business metrics that matter: user acquisition, engagement, and revenue. Partner with DesignX to transform your digital product from good to exceptional, backed by proven expertise in scaling businesses through strategic design.
    Looking for work in Cross Platform Development
    Located in San Francisco, United States
    From €5,000 for Cross Platform Development
    Worked in Software & Computer Services
    Speaks English
    11-50 members
  • 5
    (22 reviews)

    Grow Big, Grow Right.

    Highly recommended
    Top awarded
    At Rhillane, we don’t just market your brand—we ignite its full potential. As a full-service digital marketing powerhouse, we’ve helped over 615 clients worldwide, delivering +50 million dollars in client revenue and managing 15+ million dollars in ad spend. From dynamic web design and UI/UX to game-changing SEO, social ads, 2D/3D animation, and lead-generating email campaigns, our multidisciplinary experts ensure every aspect of your online presence works together to drive extraordinary growth. Our results speak louder than words. With 280 Meta Ads clients, a proven track record of +80% campaigns achieving a ROAS of 7 or higher, and a 96% client satisfaction rate, we combine cutting-edge tools, creative brilliance, and deep analytics to create tailor-made campaigns that don’t just attract clicks—they build connections. Whether it’s crafting scroll-stopping social content, executing high-ROI ad campaigns, or designing sleek, user-focused websites, our work is designed to captivate, convert, and keep your audience coming back. At Rhillane, we’re more than a digital agency—we’re your growth partner. With us, you gain access to bold ideas, strategic expertise, and a team passionate about pushing your brand to new heights. Join the ranks of top-performing businesses we’ve transformed, and let’s write your success story together. Your breakthrough starts here.
    Looking for work in Cross Platform Development
    Located in Torrance, United States (+2)
    From €1,000 for Cross Platform Development
    Worked in Clothing & Accessories (+16)
    Speaks English, Arabic(+2)
    11-50 members
  • 4.8
    (12 reviews)

    Pioneering digital innovation

    Eurisko is a multi-national software development and consultancy firm based in UAE, Saudi Arabia, Lebanon, Cyprus and US. With more than 13 years of experience and hundreds of success stories, Eurisko offers services ranging from Mobile App Development, Enterprise Web Development and Artificial Intelligence, to Game Development, Mixed Reality, UI/UX Design and Smart Cities / IoT. To position our company as the pioneer of digital innovation in the region by creating excellence in our people and forging the digital future of our clients and partners. Our mission is to empower digital transformation by delivering cutting-edge solutions and world-class digital services to our clients & partners. Our goal is to reshape their success, providing them with a distinctive competitive advantage, unlocking limitless possibilities, and driving meaningful impact in their industry landscapes. Eurisko has a proven history of excellence in various domains and has been at the forefront of driving progress in Artificial Intelligence and Data Analytics for several years. Our proficiency in these areas allows us to harness state-of-the-art algorithms and data-driven insights, enabling us to deliver groundbreaking solutions to our clients. At Eurisko, our steadfast dedication to pushing the limits of innovation has firmly established us as a pioneering influence at the intersection of technology and creativity within the Middle East.
    Looking for work in Cross Platform Development
    Located in Beirut, Lebanon (+2)
    From €1,000 for Cross Platform Development
    Worked in Banking & Financials (+2)
    Speaks English, Arabic(+1)
    51-200 members
  • 4.8
    (5 reviews)

    Your Blockchain & Web3 Partners

    Highly recommended
    Top awarded
    Welcome to Avolox —your trusted partner in blockchain and Web3 innovation. We specialize in building innovative and complex solutions across leading blockchain protocols, including Ethereum, Solana, and fully customized blockchain networks. With extensive expertise in Layer 1, Layer 2, and Layer 0 technologies, we prioritize security, scalability, and industry best practices to deliver robust and future-ready solutions. Our Vision: To become the global leader in innovative Web3 and Blockchain solutions driven by technological evolution. Our Mission: Instilling confidence and improving the quality of life for customers through Web3 and Blockchain development expertise. Our Values: Innovation - Creating new solutions with passion and unwavering enthusiasm, harnessing the latest technologies. People - Empowering personal and professional growth, fostering creativity in a multidisciplinary team. Efficiency - Embracing productive execution and proposing realistic solutions. Relentless Pro-activity - Listening and collaborating to provide tranquil solutions. Excellence - Consistently exceeding clients' needs with technological expertise. Our Expertise: EVM-Based Development: Delivering powerful solutions on Ethereum and other EVM-compatible blockchains with optimized smart contracts, DeFi platforms, NFTs, and more. SVM-Based Development: Leveraging Solana’s high-speed and low-cost infrastructure to build scalable dApps, DeFi solutions, and blockchain applications with seamless user experiences. Custom Blockchain Solutions: Crafting tailored blockchain networks from the ground up, designed to meet unique business needs with a focus on security, scalability, and innovation. Business Solutions & Automation: Integrating blockchain to streamline operations, enhance transparency, and improve efficiency through smart contracts and decentralized automation. Partner with Avolox today to bring your blockchain vision to life!
    Looking for work in Cross Platform Development
    Located in Amarillo, United States
    From €5,000 for Cross Platform Development
    Worked in Banking & Financials (+6)
    Speaks English
    11-50 members
  • (0 review)

    Scalable Software and IT Talent Solutions.

    Global IQ Services is a trusted software development and IT staff augmentation company helping businesses achieve digital transformation. With over a decade of experience, we specialize in building scalable, custom digital solutions tailored to the unique needs of startups, enterprises, and SMEs across industries like healthcare, fintech, e-commerce, and IoT. Our expertise spans mobile app development, web applications, product engineering, emerging tech solutions, and dedicated IT staffing. By leveraging cutting-edge technologies such as AI, IoT, and cloud computing, we deliver innovative and future-ready solutions that empower businesses to thrive in an evolving digital landscape. What sets us apart is our client-centric approach, transparent processes, and agile methodologies. We collaborate closely with clients to ensure seamless integration, faster time-to-market, and measurable outcomes. Our IT staff augmentation services connect you with top-tier global talent, enabling you to scale your team, meet tight deadlines, and build dynamic, high-performing teams effortlessly. Recognized as a leading name in software development, Global IQ Services is committed to quality, reliability, and excellence. With a proven track record of 150+ projects delivered to 200+ global clients, we continue to help businesses turn their ideas into impactful realities. Choose Global IQ Services for scalable IT solutions, innovative product engineering, and expert team augmentation. Together, we’ll turn your challenges into opportunities and your vision into success.
    Looking for work in Cross Platform Development
    Located in San Mateo, United States
    From €10,000 for Cross Platform Development
    Works in multiple industries
    Speaks English
    11-50 members
  • (0 review)
    Looking for work in Cross Platform Development
    Located in San Jose, United States
    From €1,000 for Cross Platform Development
    Works in multiple industries
    Speaks English
    11-50 members
  • 5
    (7 reviews)

    🏆 Exceeding Your Expectations

    Top awarded
    SEVEN is an IT partner with time-tested expertise in solving complex software challenges requiring narrow specialization . One of our biggest strengths is finding unique approaches and solutions for startups and businesses from a wide variety of industries, including crucial ones like healthcare & education. We take pride in our ability to find the technical solution and ensure that it leaves our clients room for growth and protects them from undesirable financial and technological consequences. We apply our extensive expertise to anticipate the needs of our clients and suggest improvements from a new, fresh angle. With SEVEN, our clients team up not just with tech-savvy people but with a group of experts who know how technology influences the business and how to make it align with sustained growth in the future.
    Looking for work in Cross Platform Development
    Located in New York, United States (+1)
    From €3,000 for Cross Platform Development
    Worked in Software & Computer Services (+14)
    Speaks English, Ukrainian
    51-200 members
  • 5
    (4 reviews)

    🚀 Your Cost-effective, Cross-continental, Digital Innovation Partner

    Top awarded
    Unlock the full potential of your business with Scopic and Scopic Studios — sister companies combining the power of innovative software development with strategic digital marketing. Scopic delivers cutting-edge custom solutions across web, mobile, desktop, and cross-platform technologies. Together with our digital marketing division, Scopic Studios, we offer a unique end-to-end approach: from ideation and development to growth-focused promotion and lead generation. With over 1,000 products launched and deep specialization in B2B, SaaS, healthcare, and technology brands — and more, we cover the full product lifecycle helping you scale smarter , faster , and profitably . From launching new digital products to scaling established brands, our mission is simple: maximize your return on investment by building exceptional solutions and ensuring they reach, convert, and retain the right audience. Why Work With Us: ✔ Over 1,000 Digital Products Built – Proven experience across industries and platforms ✔ Custom Software Solutions – Tailored development with AI, cloud, and cross-platform expertise ✔ Full-Funnel Marketing Strategies – SEO, Google Ads, Social Media, Content Marketing, and Lead Generation ✔ Creative Design Services – Engaging, user-centered design that drives impact ✔ From Code to Conversion – We don’t just build, we market, grow, and scale your product Certified and Trusted Across Platforms: 🚀 Google Certified Partner 🚀 HubSpot Certified Specialists 🚀 Semrush Certified Experts 🚀 AWS Advanced Tier Partner 🚀 Google Cloud Partner Our international team holds recognized certifications from industry-leading platforms and partners, ensuring your campaigns, products, and digital presence are managed with cutting-edge expertise and global best practices. Our Origin Story: Scopic Studios began as an in-house service within Scopic Software, supporting the launch and growth of hundreds of digital products. As our marketing expertise expanded, we evolved into a standalone brand — now working side by side with Scopic as a sister company, providing full-service digital marketing while staying deeply integrated with the software world. Together, we cover the complete product lifecycle: from strategy, design, and development to market outreach, user acquisition, and brand visibility. 📍 Find us on Clutch: With more than 40+ 5-star reviews ⭐⭐⭐⭐⭐ on https://clutch.co/profile/scopic-software 🌍 Explore our marketing division: https://scopicstudios.com Find us on Guru: 100% positive feedback 🌟 on https://www.guru.com/freelancers/scopic-software We offer free consultations/audits and estimates so feel free to reach out and we'll connect you to an expert!
    3 works in Cross Platform Development
    Located in Boston, United States (+1)
    From €1,000 for Cross Platform Development
    Worked in E-commerce (+11)
    Speaks English, Arabic(+3)
    201-500 members
  • 5
    (2 reviews)

    We help companies digitalize their businesses.

    Top awarded
    SumatoSoft builds complex custom software to help companies to apply the best IT innovations to meet their goals through business digitalization.  5 key points we follow and stand for:  Focus first on the business value delivery; Make the software delivery process transparent and predictable; Use only relevant solutions, approaches, and technologies; Build reliable and trustworthy communication; Teamwork is the key to success.  Promising startups, medium-sized businesses, as well as world-known brands from all over the world, such as Toyota & Lexus, World Bank, Beiersdorf, Dexai Robotics, Cornerstone OnDemand, TLNika Group, Dragon Sourcing work together with SumatoSoft to develop their software to gain competitive benefits, improve their business efficiency and effectiveness, and raise the quality of services and products to a new level. SumatoSoft stands out in the background of its competitors since it has managed to become a technological partner for its clients. The partner, who delves into a client’s business challenges, needs, and pain points and provides upscale software solutions that fully meet those needs and all requirements. 
    Looking for work in Cross Platform Development
    Located in Boston, United States
    From €10,000 for Cross Platform Development
    Worked in Retail (+12)
    Speaks English
    51-200 members
  • (0 review)
    Ace Infoway has gained 21 years of experience in a plethora of IT Services and has access to resources and teams in the United States and India. We are proud to be an extended partner and offer remote development teams for over 50+ Web Agencies & Businesses in diverse industries. Ace’s value proposition lies in its diverse domain expertise, minimum learning curve period, and efficient turn-around-time. We learn and invest for our customers and with an electrifying and eccentric team on-board, we are ready to harness the force for good. Our Esteemed Services Include: Digital Transformation MarTech Solutions Website Development Web Applications / Software Development Mobile Application Development Design Services Publishing Support Agencies and Marketing Tech Services  
    Looking for work in Cross Platform Development
    Located in Los Angeles, United States
    From €1,000 for Cross Platform Development
    Worked in Automotive
    Speaks English
    201-500 members
  • 1
    (1 review)
    App Snap is a leading software development company based in New York , offering cutting-edge solutions in mobile app development, web development, IoT, and more.
    Looking for work in Cross Platform Development
    Located in New York, United States
    From €1,000 for Cross Platform Development
    Works in multiple industries
    Speaks English
    11-50 members
  • (0 review)

    Transforming your digital dreams into Reality

    A global AI-enabled technology solutions provider specializing in web and app development, AI integration, and tech talent management. Our innovative low-code approach accelerates project timelines and reduces costs through AI-driven development processes. PegaSync has been an agency of choice for some leading businesses globally including a Fortune 10 retail giant.
    Looking for work in Cross Platform Development
    Located in Dover, United States
    From €3,000 for Cross Platform Development
    Works in multiple industries
    Speaks English
    11-50 members
  • 5
    (3 reviews)

    a product studio

    tapptitude /’taptitju:d/ = mobile apps with attitude. Tapptitude is a Product Studio that partners with funded startups and established brands to build interactive, mobile-first products that people love to use. We work with our clients as Product Partners, supporting them proactively throughout the journey from idea to launching a product and scaling it up. Startups and brands work with us to define their product, design their prototype, develop their MVP and scale a successful product. Our process stands out through our early focus on value and close partnerships. We work on each product to identify and create easy acquisition flows, generate value early to retain users, and build a solid infrastructure for scalability. Our workflows are based on lean principles, rapid prototyping techniques and agile development, making us very fast and flexible in iterating value to users. Our solutions for startups: Product definition Rapid prototyping MVP development Our solutions for larger organisations: Design sprints UX research and persona design Evidence-based growth plan Our technical team delivers full-stack implementation solutions, to build Native and React Native products for iOS, Android, Wearable Devices and the Web. Our services include: Product strategy and definition UX/UI design Mobile and web development Backend services AI, Machine learning and data science Full Testing and QA Product launch solutions Product growth We’ve built products for industries like: IoT Health Proptech Fintech Marketplaces and retail Social platforms Arts, entertainment and culture  
    Looking for work in Cross Platform Development
    Located in Cluj-Napoca, Romania (+2)
    From €1,000 for Cross Platform Development
    Worked in Beverage (+16)
    Speaks English, Dutch(+2)
    51-200 members
  • (0 review)

    Ready To Build Your Ideas

    Kodesinc is a leading software company driving digital transformation for businesses worldwide. We deliver tailored software solutions, leveraging cutting-edge technologies and a client-centric approach. Our expertise includes custom software development, web and mobile app development, cloud solutions, data analytics, and AI. With a focus on collaboration, agility, and exceptional support, we empower businesses to thrive in the digital age. Partner with us for innovative software solutions that propel your organization to success.
    Looking for work in Cross Platform Development
    Located in Sugar Land, United States
    From €1,000 for Cross Platform Development
    Worked in Transportation (+9)
    Speaks English
    11-50 members
  • (0 review)

    Software development organic team that’s ready to start delivering from day one

    What if your software team didn’t feel like an external vendor but an integral part of your business? A team so in sync with your goals that it feels like they’ve always been there? At Smartexe, we don’t just write code or deliver projects. We design teams. Organic teams that don’t need endless onboarding or hand-holding. From day one, it’s seamless collaboration — no friction, no disconnect. Since 2004, we’ve taken on over 214 unique challenges across industries like telecommunications and IoT. We’ve created everything from mobile and desktop apps to admin dashboards, chat systems, and billing platforms. Every solution is designed to do more than just work — it’s built to elevate how your business operates. Here’s the secret: no two projects are the same, and neither are our teams. We tailor each one, pulling together exactly what you need — architects, developers, designers, project managers, QA experts. Every person, every skill, chosen specifically for your project. The tech we use isn’t just cutting-edge; it’s forward-thinking. We don’t just build for today. We anticipate where you’re going. From the codebase to the platforms, everything is designed to scale with your ambitions. And before we hand over anything, we obsess over every detail — testing, tweaking, perfecting — to ensure a release that’s as smooth as it is solid. Because great software isn’t just functional. It’s intuitive, seamless, and transformative. With Smartexe, you don’t just get a product. You get a team that feels like yours.
    Looking for work in Cross Platform Development
    Located in Bene Beraq, Israel
    From €5,000 for Cross Platform Development
    Works in multiple industries
    Speaks English, Hebrew
    201-500 members
12

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