Best California Startup App Development Companies

255 Companies - Rankings updated: August 22, 2026

Each agency listed on DesignRush is assessed for industry expertise and customer testimonials are evaluated in order to provide you with a vetted selection. Certain listings represent paid partnerships.

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  • Appsters

    Tech Company That Provides App Solutions

    Tech Company That Provides App Solutions

    At Appsters, we build custom iOS, Android and cross-platform Apps from MVPs that validate your idea to enterprise-grade solutions that scale to millions of users. Industries including Fintech, Healthcare, Ecommerce and SaaS, we don't just write code we engineer products that grow businesses...

    Top Services:

    • Mobile App Development
    • Blockchain
    • Software Development
    Location
    San Jose, California
    Number of Employees
    250 - 499
    Average Hourly Rate
    $150/hr
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    3 Projects Listed
    View Profile
    5.0 5.0 (4)

  • TechMatter

    Health Tech and Managed IT Services Company

    Health Tech and Managed IT Services Company

    TechMatter is a leading global provider of technology and healthcare solutions headquartered in Glendale, California. The company specializes in enterprise software development, automation, and revenue cycle management, empowering organizations to streamline operations and achieve sustainable growth. With a...

    Top Services:

    • Digital Services
    • Design Services
    • UI/UX Design
    • Web Development
    • Affiliate Marketing
    • Show more
    Location
    Glendale, California
    Number of Employees
    500 - 999
    Average Hourly Rate
    $100/hr
    View Profile
    4.5 4.5 (40)

  • Staydify Systems

    Empowering Your Business Growth With Precision

    Empowering Your Business Growth With Precision

    Staydify Growth Systems is a division of the UK-based HiringBooster Group, focused on driving technology-enabled business growth. The company specializes in delivering advanced custom software development and precision IT staffing services, leveraging its global footprint across the UK, USA, India, and other...

    Top Services:

    • Software Development
    • IT Services
    • Web Design
    • Web Development
    • Mobile App Development
    • Show more
    Location
    San Francisco, California
    Number of Employees
    100 - 249
    Average Hourly Rate
    $10/hr
    Minimal Budget
    Under $1,000
    View Profile

  • Aunimeda

    From The Silicon Steppe To Silicon Valley

    From The Silicon Steppe To Silicon Valley

    Aunimeda Software is a premier IT agency specializing in high-performance Next.js development, international SEO, and strategic branding. Established in 2010, we bridge the gap between US business standards and elite Central Asian engineering. With a 24/7 "Follow-the-Sun" development cycle across our hubs in...

    Top Services:

    • Software Development
    • Mobile App Development
    • Web Design
    • Web Development
    • AI Development
    • Show more
    Location
    Los Angeles, California
    Number of Employees
    100 - 249
    Average Hourly Rate
    $100/hr
    Minimal Budget
    $1,000 - $10,000
    View Profile
    5.0 5.0 (11)

  • Naked Development

    We are a Creative Development Agency & Consultancy.

    We are a Creative Development Agency & Consultancy.

    Naked Development transforms businesses through expert App Development, partnering with founders to design, develop, and launch apps that solve real problems. Our customized approach ensures top-tier results for startups, helping you avoid costly missteps and turn your vision into a thriving company...

    Top Services:

    • Mobile App Development
    • UI/UX Design
    • Digital Marketing
    • Branding
    • Product Design
    • Show more
    Location
    Irvine, California
    Number of Employees
    Under 49
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    12 Projects Listed
    View Profile
    2.6 2.6 (3)
    4.2 4.2 (11)

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