Ranked · 65 of 71 assessed
Ordered by Agency List ScoreAI-driven web and mobile app development for startups and enterprises
AI-driven healthcare app development and EHR integration
Transforms MVPs to production-ready apps with rapid development
Digital products through strategy, design, and development
Mobile apps, AI models, and blockchain solutions built across iOS and Android platforms
Crafts AI-driven mobile apps and enterprise solutions
Develops mobile apps for startups and enterprise clients
Custom mobile app development for healthcare and IoT solutions
Mobile app development with human intelligence and emotional insight
Building iOS, Android, and cross-platform apps with AI and UI/UX design
Native iOS, Android, Flutter, and React Native apps from MVP through launch
Custom software and AI solutions for fintech and healthcare
Digital transformation with AI and mobile app development expertise
Development and dev services for inbound lead capture and search visibility
AI-driven mobile and web app development for diverse industries
Mobile app development with rapid prototyping and user-focused design
Digital transformation and AI solutions for diverse industries
Hire dedicated developers for scalable tech solutions
Builds apps for entrepreneurs with market validation and AI-enhanced workflows
Connected apps and backend systems for phones, tablets, TVs, and smart devices
Analytics and PPC services for inbound lead capture and search visibility
Mobile app development and emerging technologies since 2001
Custom web and mobile software for every device
Digital solutions with web, mobile, and staffing expertise
Development and dev services for inbound lead capture and search visibility
Custom iOS, Android, and cross-platform app development built on a proprietary framework
SEO and PPC services for inbound lead capture and search visibility
Mobile app and web development with global reach
Mobile, cloud, and AI engineering services spanning MVP to production deployment
Strategy and PPC services for inbound lead capture and search visibility
Specialized development services for mobile and web applications
Native iOS and Android apps, APIs, UI design, and machine learning integration
App design and development for mobile, web, and wearables
Digital transformation through mobile apps and cloud technologies
On-demand design, engineering, and AI-powered execution across 38+ dev stacks
Dedicated software engineers building FinTech and HealthTech platforms across web, mobile, and cloud
SEO and PPC services for inbound lead capture and search visibility
iOS and Android apps built for public safety agencies and community organizations
Custom mobile app and software development for diverse industries
Embedded engineering and app development for innovative solutions
Develops mobile apps and AI solutions for diverse industries
Mobile apps, web design, and cloud services for diverse industries
Mobile app development for healthcare and government sectors
Mobile and web app development with cloud consulting and UI/UX design.
AI-driven customer engagement and digital transformation services
Develops BLE-powered mobile apps for smart solutions
Mobile, web, and desktop app development with SEO and marketing services
Mobile app development and design studio in Los Angeles
iOS, Android, and HIPAA-compliant healthcare app development since 2009
Custom software and mobile app development for small to midsize organizations
Creates user-centered websites, digital experiences, and native apps
Development and dev services for inbound lead capture and search visibility
Streamlining Tech Landscapes with AI and Integration Services
Web and mobile application development for diverse industries
Custom software, AI workflow automation, and SEO for Sacramento and nationwide clients
iPhone, Android, wearable, and AR app development with web and ASP.NET support
Designs and develops mobile apps, web services, and embedded systems
AI-driven software and marketing solutions for business automation
AI-Native Digital Engineering Company
Software development outsourcing and staff augmentation for global clients
Custom application development, systems integration, and testing for iGaming, healthcare, and finance platforms
Website, app, and cloud development for travel, real estate, healthcare, and finance clients
Custom websites, mobile apps, and integrations for industry, government, and nonprofit clients
Mobile solutions and software testing for enterprise needs
Custom mobile apps and AI solutions for global businesses
Also in California · 20 not ranked here
14 have not yet been assessed on the Agency List Score. Alphabetical.About this ranking
What this page ranks
This page ranks 65 of the 71 assessed mobile app development agencies in California, United States — the ones carrying a published score — out of 85 listed.
The score measures how well an agency documents its own work in public — named clients, quantified outcomes, and whether those outcomes are attributed to the agency rather than described as the client's own results. It does not measure client satisfaction, price, or availability.
Cohorts and awards
Agencies are compared within a cohort — here, Mobile App Development in California, United States. A cohort must be large enough to express the band being awarded: at least 8 assessed agencies for a top 25% award, 20 for top 10%, 40 for top 5%, and 300 for top 1%. This one holds 71, so the strongest award available here is top 5%.
The 14 mobile app development agencies not yet assessed are listed on this page but not ranked.
A further 6 were assessed and no published evidence of their work was found, so no score is shown for them.
Paid placement
Partner agencies can buy a labelled placement block above the ranking on this page. It is always marked as paid and is never mixed into the ranked list.
Placement is paid; it does not affect the ranking, cohort membership, or any agency's score. Ranking position, cohort membership and the score itself are not for sale.
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Services in California
Mobile App Development nearby
Questions
- How many mobile app development agencies are in California, United States?
- 85 are listed on Agency List in California, United States. 71 of them have been assessed on the Agency List Score as of October 2026, and 65 of those carry a published score.
- Which mobile app development agency in California, United States is ranked highest?
- Grio has the top Agency List Score, 98, among the 71 assessed agencies in Mobile App Development in California, United States.
- Why are 20 mobile app development agencies listed here but not ranked?
- 14 of the 85 listed have not yet been assessed on the Agency List Score. A further 6 were assessed and no published evidence of their work was found, so no score is shown for them. They each have a profile and are listed below the ranking, alphabetically, rather than being hidden or mixed into it.
- How is the ranking determined?
- By Agency List Score, within the Mobile App Development in California, United States cohort of 71 assessed agencies. The score is computed from evidence published on each agency's own website: named clients, quantified outcomes, and whether the outcome is attributed to the agency. Paid placement does not affect it.