We’ve researched and ranked the best California HTML5 mobile app development agencies that build sophisticated and high-quality apps that help brands drive more loyal customers and sales. Compare listings by past work, reviews, cost and size to pick the best fit for you.

Best HTML5 Mobile App Development Agencies in California

3 Companies - Rankings updated: August 22, 2026

We evaluate every agency on DesignRush according to expertise credentials and client satisfaction ratings. Some placements are sponsored.

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  • Seasia Infotech

    Enterprise AI Solutions | Scalable . Flexible. Sustainable

    Seasia Infotech is a global AI-powered digital engineering company with 25+ years of experience delivering custom software, AI solutions, cloud applications, mobile apps, and enterprise platforms. We help businesses accelerate innovation, improve efficiency, and drive digital transformation...

    Location
    Emeryville, California
    Number of Employees
    500 - 999
    Average Hourly Rate
    $25/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    54 Projects Listed

    Seasia Infotech Services

    • Software Development
    • Mobile App Development
    • Web Development
    • AI Development
    • Big Data Analytics
    • Cloud Consulting
    • Staff Augmentation
    • Cybersecurity
    • IoT
    • Software Testing
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Adani Group
    • Flipkart
    • Harley-Davidson
    • Microsoft
    • MainStreet Equity Corp
    • HDFC Bank
    • Swaraj
    • Innopharma Education
    • Renault
    • Puda
    Data sourced from the agency's DesignRush profile

    Seasia Infotech Reviews & Testimonials

    • cornelia verden
      cornelia verden Web Developer at Cornelia Verden LLC
      5.0 ★

      eCommerce Development Review from cornelia verden

      This Company is AMAZING, they are very professional. We hired them to build my website, and they did an EXCELLENT job. They continuously communicated with me during the development phase. If you want a beautiful, well-designed, professional website that has optimum functionabilty, You must go with Seasia Infotech. You can always expect excellent quality services from the professionals at Seasia Infotech.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
    Visit Website View Profile
    4.3 4.3 (1)

  • Double Coconut

    We Build Games That Players Love.

    Double Coconut is a San Franciscobased boutique game development studio founded in 2012. The agency specializes in full-service game design and co-developmentfrom casual mobile and web titles to casino, mid-core, and Web3 games. Their projects have reached over 5 million players and generated...

    Location
    San Francisco, California
    Number of Employees
    50 - 99
    Average Hourly Rate
    $25/hr
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    8 Projects Listed

    Double Coconut Services

    • Software Development
    • Web Design
    • Mobile App Development
    • Blockchain
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Microsoft
    • WB
    • Cartoon Network
    • Ellen Degeneres
    • MIT
    • IBM
    • SAP
    • iWin
    • Addicting Games
    • Penn Gaming
    Data sourced from the agency's DesignRush profile
    Visit Website View Profile

  • Easiio

    AI Power Agency and Development Shop.

    Easiio build AI tools called ChatAI. We help our customers with these tools and implemented Large Language Model base AI technologies for their website or business software. Helping our customers do more with less and improve their efficiency. Our rate is very competitive with the help of AI and quality of...

    Location
    Santa Clara, California
    Number of Employees
    50 - 99
    Average Hourly Rate
    $30/hr
    Minimal Budget
    $1,000 - $10,000

    Easiio Services

    • Web Design
    • Web Development
    • WordPress Website Design
    • AI Development
    • Mobile App Development
    • Software Development
    • Email Marketing
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Seraph Direct
    • Weee
    • SkyMeta
    • Pfizer
    • EcoSense
    • TheAllStars
    • TechThisOut
    • Neuvition
    • Harsco
    • McDonals
    Data sourced from the agency's DesignRush profile
    Visit Website View Profile

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