Best California Startup App Development Companies

337 Companies - Rankings updated: April 01, 2026

DesignRush vets all agencies based on professional qualifications and verified customer feedback to help you choose confidently. Some featured agencies maintain paid sponsorships.

United States × California ×
  • Developing and integrating eCommerce apps

    Developing and integrating eCommerce apps

    Since 2012, Attractor Software LLC has offered Custom Software Development as an outsourcing service for projects of varying complexity and size.  [... view Attractor Software profile ]
    Location
    Los Angeles, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $49/hr
    Minimal Budget
    $10,000 - $25,000
  • We Build Startups

    We Build Startups

    E8 Labs goes beyond the typical agency role by providing founders and startups with a distinctive approach to reaching product market fit at an accelerated pace. In addition to developing an MVP, we also prioritize scalability for subsequent versions.  [... view E8 Labs profile ]
    Location
    San Jose, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $199/hr
    Minimal Budget
    $25,000 - $50,000
  • Your Extended Engineering Team

    Your Extended Engineering Team

    Argusoft is a trusted software solutions design consultancy that provides end-to-end, enterprise-class turnkey solutions. Our team of Argonauts are trained to think design at every step, architecting, designing, and coding with the business goals and objectives of our clients in mind.  [... view Argusoft profile ]
    Location
    Newark, California
    Number of Employees
    250 - 499
    Average Hourly Rate
    $30/hr
    Minimal Budget
    $25,000 - $50,000
  • Build, Launch & Refine

    Build, Launch & Refine

    Uptech Studio partners with startups and rapid-growth companies to build, launch and refine great software products. Our expert team of product, design and technology enthusiasts creates engaging and scalable apps that satisfy both users and businesses, whether it's a native iOS or Android app, a  [... view Uptech Studio profile ]
    Location
    Tustin, California
    Number of Employees
    Under 49
    Minimal Budget
    $50,000 & Up
  • We Make Your Brand Just the Way You Imagine!

    We Make Your Brand Just the Way You Imagine!

    Oui Will is a digital agency that builds influential brands and innovative digital products with a focus on the "Tech for Good" sector. The agency operates in San Diego and Paris and has received over 20 awards in the past year.  [... view Oui Will profile ]
    Location
    San Diego, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $300/hr
    Minimal Budget
    $50,000 & Up
  • Enterprise-grade Solutions

    Enterprise-grade Solutions

    We work with world-class startups, businesses, and institutions as part of an exceptional team of software engineers and technology wizards.  [... view Programize LLC profile ]
    Location
    Riverside, California
    Number of Employees
    100 - 249
  • We Grow Apps Faster, Better & Cheaper

    We Grow Apps Faster, Better & Cheaper

    App Masters is a boutique mobile app marketing agency that is committed to assisting app publishers and entrepreneurs in achieving increased downloads and sales. Our cost-effective solutions focus on optimizing every aspect of your app's performance, from acquisition to retention. Join us in driving growth  [... view App Masters profile ]
    Location
    Danville, California
    Number of Employees
    Under 49
  • Crafting Online Success Stories, One Pixel At A Time

    Crafting Online Success Stories, One Pixel At A Time

    We take great pride in our work, showcasing resourcefulness and a keen ability to address nuanced challenges. We adeptly tackle issues as they arise, continuously refining our systems to optimize outcomes for our esteemed clients. With extensive experience in remote work environments, we have forged an  [... view SMV EXPERTS LLC profile ]
    Location
    San Marcos, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $70/hr
    Minimal Budget
    $10,000 - $25,000
  • Straight hands. Hot heads.

    Straight hands. Hot heads.

    We use the best world practices (YAGNI, KISS, DRI, and SOLID). An enterprise approach is an advantage, not an excuse. An extreme approach to development allows us to resort to the use of development-driven methodologies, in particular design, domain, bound, and testing.  [... view Atlantis profile ]
    Location
    Newport Beach, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $50/hr
    Minimal Budget
    $1,000 - $10,000
  • Building Intelligent Software Solutions

    Building Intelligent Software Solutions

    Cygnis Media, a top-tier custom software development company and leading IT consulting service provider in the USA, is synonymous with excellence. They specialize in creating bespoke software solutions tailored to meet diverse business needs. With a keen eye for innovation and a customer-first approach  [... view Cygnis profile ]
    Location
    Pleasanton, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $100/hr
    Minimal Budget
    $1,000 - $10,000
  • AI Power Agency and Development Shop.

    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  [... view Easiio profile ]
    Location
    Santa Clara, California
    Number of Employees
    50 - 99
    Average Hourly Rate
    $30/hr
    Minimal Budget
    $1,000 - $10,000
  • Meticulous Testing, Timely Delivery, Every Time!

    Meticulous Testing, Timely Delivery, Every Time!

    QASource, based in Pleasanton, CA, offers a comprehensive suite of software testing solutions to meet diverse needs. With a focus on precision and innovation, QASource is a strategic partner in ensuring software quality and reliability. The agency's expertise spans various testing methodologies and  [... view QASource, Inc profile ]
    Location
    Pleasanton, California
    Number of Employees
    Under 49
  • Southern Californias Mobile App experts since 2009

    Southern Californias Mobile App experts since 2009

    We are San Diego's mobile-native and mobile-first consultancy. We specialize in Swift for iOS, Flutter for iOS/Android, and React for Web. We have led projects for Fortune 500 companies and startups. If you're looking for an easy-to-talk-to and experienced partner to build your app, call devAtelier!  [... view DevAtelier profile ]
    Location
    San Diego, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $125/hr
    Minimal Budget
    $10,000 - $25,000
  • Experience-Driven Engineering to Digitally Transform Your Business To Stay Ahead.

    Experience-Driven Engineering to Digitally Transform Your Business To Stay Ahead.

    Experience-driven engineering to digitally transform your business to stay ahead. We understand your vision and help you build your thoughts into world-class software products. We work with businesses and individuals to help build world-class products and incubate them to grow. Trust us as your technology  [... view AeroQube profile ]
    Location
    Pleasanton, California
    Number of Employees
    50 - 99
    Average Hourly Rate
    $25/hr
  • Create Better Products with Creative Design.

    Create Better Products with Creative Design.

    Welcome to Yihang's Portfolio! My name is Yihang Ouyang, I'm a professional Product / UX Designer currently based in San Francisco, California.  [... view Yihang's Portfolio profile ]
    Location
    San Francisco, California
    Number of Employees
    Under 49
  • We Build Tomorrow, Today

    We Build Tomorrow, Today

    With 15 years of experience, we specialize in developing startups, cryptocurrency exchanges, cashback platforms, Telegram bots, and complex software solutions for clients across the USA and Europe. Our expertise guarantees tailored, high-quality solutions for diverse industries and business needs.  [... view Zavod-IT profile ]
    Location
    San Francisco, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $60/hr
  • You Set Expectations. We Exceed Them.

    You Set Expectations. We Exceed Them.

    Bransys Group was first introduced into the marketplace in 2008 in Skopje, Macedonia, founded by Branko Trajkovski. Bransys is a product-oriented company that makes, develops and sales Hardware and Software, designed for GPS and tracking devices.  [... view Bransys profile ]
    Location
    Walnut Creek, California
    Number of Employees
    50 - 99
    Average Hourly Rate
    $50/hr
    Minimal Budget
    Under $1,000
  • Software Development Made Easier.

    Software Development Made Easier.

    Craft exceptional digital solutions with a team of design, development, and strategy specialists. Everything you need is in one place.  [... view MEV profile ]
    Location
    Walnut Creek, California
    Number of Employees
    100 - 249
    Average Hourly Rate
    $45/hr
    Minimal Budget
    $50,000 & Up
  • Forging Digital Realities.

    Forging Digital Realities.

    Appnality is an American software company that offers diverse mobile app development services. Be it App Concept and Strategy or UX and UI design development, Appnality has all your mobile app needs covered. Our quality assurance, testing, and data protection provide you with a fulfilling, keeping you and  [... view Appnality profile ]
    Location
    Fremont, California
    Number of Employees
    50 - 99
    Average Hourly Rate
    $50/hr
    Minimal Budget
    $10,000 - $25,000
  • Big Ideas Start with SunerGarcia.

    Big Ideas Start with SunerGarcia.

    We are SunerGarcia. We are an innovative digital marketing agency that focuses on building around technology and consumer experience. We build exciting brand experiences for our clients. Our team is a fine assortment of movers and shakers, creatives, designers, planners, tech enthusiast, and all around hard  [... view SunerGarcia profile ]
    Location
    San Diego, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $150/hr
    Minimal Budget
    $1,000 - $10,000
  • Provide IT Solutions.

    Provide IT Solutions.

    We are IT company which provides services in various domains like Logistics, Health, e-commerce, etc. We have expert-level knowledge in web development and mobile development, as well as proficient knowledge of latest IOT-based applications using various AWS services.  [... view ICommuneTech profile ]
    Location
    Los Angeles, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $50/hr
    Minimal Budget
    $1,000 - $10,000
  • Your Marketplace in a Month.

    Your Marketplace in a Month.

    At Start Mobile, we create innovative online marketplaces featuring mobile apps and AI-powered by ChatGPT. Our unique approach ensures each platform is tailored to meet specific business needs, enhancing user experience and functionality. Partner with us to leverage cutting-edge technology and transform your  [... view Start Mobile profile ]
    Location
    Los Angeles, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $35/hr
    Minimal Budget
    $1,000 - $10,000
  • Trusted Software Engineering Solutions Provider based in Vietnam, With A Global Presence.

    Trusted Software Engineering Solutions Provider based in Vietnam, With A Global Presence.

    As a trusted bespoke software development outsourcing company, we help business organizations tackle challenges of outdated software, inefficient processes, and poor digital presence.  [... view Trustify Technology profile ]
    Location
    San Jose, California
    Number of Employees
    100 - 249
    Minimal Budget
    $10,000 - $25,000
  • Bluezoo Web Is Your Digital Partner for Success.

    Bluezoo Web Is Your Digital Partner for Success.

    BlueZoo Web is your digital partner for success. With our expertise in Web Design, SEO, Digital Marketing, and more, we'll help your business make a splash online and stand out from the competition. Let us guide you through the digital landscape and elevate your online presence to new heights.  [... view BlueZooWeb profile ]
    Location
    San Ramon, California
    Number of Employees
    50 - 99
    Average Hourly Rate
    $25/hr
    Minimal Budget
    Under $1,000
  • Tailored Digital Solutions to Drive Your Business Forward.

    Tailored Digital Solutions to Drive Your Business Forward.

    We understand that every business is unique. That's why we offer a comprehensive suite of services designed to meet your specific needs and drive meaningful results. Whether you want to enhance your online presence, streamline product development, or revolutionize user experience, our team of experts is here  [... view Delphi Tech Consulting profile ]
    Location
    San Francisco, California
    Number of Employees
    Under 49
    Minimal Budget
    $1,000 - $10,000
  • Solutions for Technology and Marketing.

    Solutions for Technology and Marketing.

    3DEX Inc., a California-based software provider, delivers innovative solutions globally, serving industries such as healthcare, e-commerce, logistics, and finance. With expertise in AI, quantum computing, and advanced software development, we help businesses transform through cutting-edge technology  [... view 3DEX profile ]
    Location
    Irvine, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $149/hr
    Minimal Budget
    Under $1,000
  • Your Vision, Our Expertise

    Your Vision, Our Expertise

    KB Solutions delivers personalized digital marketing and branding services to help businesses stand out and thrive in competitive markets.  [... view KB Solutions profile ]
    Location
    Pasadena, California
    Number of Employees
    100 - 249
    Average Hourly Rate
    $100/hr
    Minimal Budget
    $10,000 - $25,000
  • Launching Ideas, Transforming Businesses

    Launching Ideas, Transforming Businesses

    ByteLaunch specializes in custom software development, empowering businesses to bring innovative ideas to life through technology.  [... view ByteLaunch profile ]
    Location
    San Juan Capistrano, California
    Number of Employees
    100 - 249
    Average Hourly Rate
    $140/hr
    Minimal Budget
    $25,000 - $50,000
  • USA's Top-Ranked Logo Design Agency

    USA's Top-Ranked Logo Design Agency

    California Logo Designs is a renowned logo design agency based in Irvine, California, USA. The agency specializes in helping brands enhance their online presence through captivating branding strategies, earning trust and recognition worldwide.  [... view California Logo Designs profile ]
    Location
    Irvine, California
    Number of Employees
    100 - 249
    Average Hourly Rate
    $100/hr
  • Innovating Brand Experiences.

    Innovating Brand Experiences.

    HL Agency is a creative powerhouse specializing in building immersive brand experiences, delivering impactful campaigns that engage audiences and drive measurable results.  [... view H/L Agency profile ]
    Location
    Oakland, California
    Number of Employees
    100 - 249
    Average Hourly Rate
    $70/hr
    Minimal Budget
    $10,000 - $25,000
  • Designing More Human Experiences.

    Designing More Human Experiences.

    We are Lab 201, a multidisciplinary team of trouble-makers and problem-solvers working together to design, engineer, build, and test the future.  [... view Lab 201 LLC profile ]
    Location
    Los Gatos, California
    Number of Employees
    Under 49
  • Empowering Businesses Through AI- Driven Digital Transformation

    Empowering Businesses Through AI- Driven Digital Transformation

    Brightter is a global AI-driven digital transformation company based in San Francisco. We have partnered with forward-thinking businesses for over a decade to create exceptional digital experiences. Our expertise spans AI transformation, brand strategy, website development, web applications, and search engine  [... view Brightter Inc. profile ]
    Location
    San Francisco, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $120/hr
    Minimal Budget
    $10,000 - $25,000
  • Building Websites, Crafting Apps, Empowering Your Digital Future.

    Building Websites, Crafting Apps, Empowering Your Digital Future.

    We specialize in creating custom websites and applications that drive innovation and enhance user experiences. From sleek, responsive designs to powerful, user-friendly apps, we bring your digital vision to life with precision and creativity.  [... view FZHP Global Vision profile ]
    Location
    Ontario, California
    Number of Employees
    50 - 99
    Average Hourly Rate
    $85/hr
    Minimal Budget
    Under $1,000
  • Specializing in technology development and marketing services.

    Specializing in technology development and marketing services.

    Covinten Media is a dynamic agency specializing in both technology development and marketing services. We create advanced digital products for businesses and implement marketing strategies to boost brands visibility and growth. Our dual expertise ensures comprehensive support for your business's success in a  [... view Covinten Media profile ]
    Location
    Los Angeles, California
    Number of Employees
    Under 49
    Minimal Budget
    Under $1,000
  • Fast and efficient Nocode & AI Apps.

    Fast and efficient Nocode & AI Apps.

    Codi Technologies helps businesses build applications efficiently by providing nearshore design and development services. We leverage low code tools, top tier designers & developers skilled in frontend and backend, integrations, and UX/UI to deploy ideas quickly.  [... view Codi Technologies profile ]
    Location
    Los Angeles, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $125/hr
    Minimal Budget
    $1,000 - $10,000
  • Powering Your Digital Titan!

    Powering Your Digital Titan!

    Transforming Ideas Into Cutting-Edge Websites!Titan Web Studios specializes in Web Design & Development, UI/UX Design, Mobile App Development, Search Engine Optimization (SEO), Social Media Marketing and Branding. Providing the Best Digital Services across the Nation to Elevate your Business.  [... view Titan Web Studios profile ]
    Location
    Oakland, California
    Number of Employees
    100 - 249
    Average Hourly Rate
    $45/hr
    Minimal Budget
    $1,000 - $10,000
  • Your Vision, Our Innovation Together, We Build the Future.

    Your Vision, Our Innovation Together, We Build the Future.

    RSunBeat Software is a globally trusted leader in mobile app development, serving businesses in the USA, UK, Australia, Italy, Dubai, Brazil, and more. We design innovative, high-quality apps that boost growth, elevate user experiences, and turn ideas into powerful digital solutions.  [... view RSunBeat Software profile ]
    Location
    California City, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $15/hr
    Minimal Budget
    $1,000 - $10,000
  • Your Full Digital Development Experience.

    Your Full Digital Development Experience.

    Phoenix Afterglow is a premier multimedia company specializing in web development, app development, online marketing, and cybersecurity. They are dedicated to upholding the highest standards of performance, integrity, and ethics to ensure client satisfaction and achieve a lasting sense of fulfillment for all  [... view Phoenix Afterglow profile ]
    Location
    Irvine, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $50/hr
    Minimal Budget
    $1,000 - $10,000
  • Experience Award Winning UX/UI Design From Us.

    Experience Award Winning UX/UI Design From Us.

    Eyfect Designs is a full-service digital agency specializing in web design, development, and mobile app solutions. We create custom, responsive websites and mobile apps tailored to your brand's needs. Our services also include SEO, digital marketing, UI/UX design, and app maintenance. We are dedicated to  [... view Eyfect Designs profile ]
    Location
    San Diego, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $35/hr
    Minimal Budget
    $1,000 - $10,000
  • We Turn Your Vision Into Reality

    We Turn Your Vision Into Reality

    Helping U.S. businesses grow online since 2022, we provide affordable custom web design and SEO services that deliver measurable results.  [... view Own Web Solutions profile ]
    Location
    Ontario, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $20/hr
    Minimal Budget
    Under $1,000
  • Top 1% Tech Talent with 1500+ In-house Developers

    Top 1% Tech Talent with 1500+ In-house Developers

    We don't just build software at Top Remotely we create solutions that work, scale, and impress. With a powerhouse team of 150+ in-house developers, we turn complex challenges into seamless digital experiences. Whether you need custom software, enterprise platforms, or next-gen IT solutions, we bring the Top  [... view Top Remotely profile ]
    Location
    Los Angeles, California
    Number of Employees
    500 - 999
    Average Hourly Rate
    $20/hr
    Minimal Budget
    $10,000 - $25,000
  • Affordable & Premium Web Development Company

    Affordable & Premium Web Development Company

    Royce Web Solutions is a full service digital agency specializing in custom websites, e-commerce stores, SaaS platforms, and AI-Powered web and mobile apps. We help startups and businesses turn ideas into fast, scalable and user-friendly digital products.  [... view Royce Web Solutions profile ]
    Location
    Mountain View, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $35/hr
    Minimal Budget
    $1,000 - $10,000
  • Redesigning and Modernizing Software and Applications.

    Redesigning and Modernizing Software and Applications.

    Iteration Group is a boutique product-strategy and user-experience consultancy founded in 2011. The agency partners with startups, well-capitalized ventures, consumer brands, and enterprises to deliver purposeful product design from UX/UI strategy and wireframes to functional prototypes and scalable app  [... view Iteration Group profile ]
    Location
    Westlake Village, California
    Number of Employees
    Under 49
  • Innovative Digital Solutions For A Smarter Future

    Innovative Digital Solutions For A Smarter Future

    Rysysth Technologies is a full-service IT solutions provider specializing in web development, digital transformation, and enterprise solutions. We help businesses scale with modern technologies, user-friendly designs, and performance-driven strategies. From custom websites to cloud-based platforms, our team  [... view Rysysth Technologies profile ]
    Location
    Sacramento, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $45/hr
    Minimal Budget
    $10,000 - $25,000
  • Your Marketing Success Advisor

    Your Marketing Success Advisor

    Boost your business with data-driven digital marketing from Californias top agency. Marketing Powerhouse offers comprehensive strategies including SEO, social media, PPC, content marketing, web design, and brand management.  [... view Marketing Powerhouse profile ]
    Location
    San Jose, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $50/hr
    Minimal Budget
    Under $1,000
  • Industry-Specific, Ready To Deploy Solutions That Drive Results

    Industry-Specific, Ready To Deploy Solutions That Drive Results

    Fortunesoft is an AI-driven digital engineering and solutions company specializing in Healthcare, Life Sciences, and Fintech.  [... view Fortunesoft IT Innovations profile ]
    Location
    Sunnyvale, California
    Number of Employees
    50 - 99
    Minimal Budget
    $10,000 - $25,000
  • Tech Company That Provides App Solutions

    Tech Company That Provides App Solutions

    At Appsters, innovation and reliability are at the core of everything we do. We dont just build apps; we build digital experiences that empower brands to thrive in todays competitive market. As a digital tech company we offer innovative mobile app solutions to every type of business & industry. Give your  [... view Appsters profile ]
    Location
    San Jose, California
    Number of Employees
    250 - 499
    Average Hourly Rate
    $250/hr
    Minimal Budget
    $25,000 - $50,000
  • Powering IT Excellence

    Powering IT Excellence

    Bellvia Solutions is a North American IT Managed Service Provider (MSP) delivering enterprise-grade IT, cybersecurity, cloud, and connectivity services available under your brand.  [... view Bellvia Solutions profile ]
    Location
    Irvine, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $80/hr
  • Empower Your Business through Transformative IT Services.

    Empower Your Business through Transformative IT Services.

    United Techno is a global IT-services and consulting firm offering data management & AI solutions, application modernization, cloud & legacy-system modernization, integration, QA/testing, and digital transformation helping businesses across retail, logistics, life sciences, e-commerce and other sectors  [... view United Techno profile ]
    Location
    Pleasanton, California
    Number of Employees
    250 - 499
  • Elite Services That Multiply Revenue

    Elite Services That Multiply Revenue

    SEOFAT is a full-service digital agency offering SEO, web development, and marketing solutions. We help brands grow visibility, leads, and revenue through smart, data-driven strategies.  [... view SEOFAT profile ]
    Location
    Irvine, California
    Number of Employees
    100 - 249
    Average Hourly Rate
    $25/hr
    Minimal Budget
    $1,000 - $10,000

About The Author and Expert Reviewer

Selina Garcia has authored 500+ articles and edited 50+ published books in economics, law, and history. Her unique blend of experiences allows her to approach content creation from a well-rounded perspective. Currently, Selina applies her expertise to producing insightful articles on IT, software, and applications for DesignRush.

Former Development Director

Sergio is a technology leader with over six years of experience managing global teams and delivering projects across fintech, sportstech, and B2B platforms. At DesignRush, he drove product growth and development execution, building tools that speed up processes by 95% and cut costs by 35% while maintaining full uptime.