Top Cross-Platform App Development Companies in California

Best Cross-Platform App Development Companies in California

237 Companies-Rankings updated: September 17, 2026

DesignRush evaluates each agency using expert assessment and client feedback to inform your choices. Some featured agencies have paid placements.

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United States × California × Cross-Platform Mobile App Development ×Clear Filters

Appinventors Inc
Digital Transformation Agency.
Digital Transformation Agency.
Appinventors stands as a prominent Digital Transformation Agency, enabling businesses to prosper within the contemporary digital landscape. At Appinventors, we pride ourselves on delivering exceptional customer support and assistance. Whether you're facing technical challenges or seeking guidance on your...
Top Services:
IoT
Mobile App Development
Digital Services
UI/UX Design
Software Development
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Location
Los Angeles, California
Number of Employees
50 - 99
Average Hourly Rate
$25/hr
Minimal Budget
$10,000 - $25,000
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B3NET Inc
Think Digital
Think Digital
B3NET Inc. stands as a leading web design company, offering personalized website solutions, digital marketing, app development, and AI integration services to small and mid-sized businesses in Dallas, Texas. With roots dating back to 1999, our skilled team is committed to providing responsive website design...
Top Services:
Web Design
Web Development
WordPress Website Design
eCommerce Development
Digital Marketing
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Location
Santa Ana, California
Number of Employees
Under 49
Average Hourly Rate
$50/hr
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Top Remotely
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...
Top Services:
Mobile App Development
Software Development
DevOps Consulting
IT Services
Web Development
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Location
Los Angeles, California
Number of Employees
500 - 999
Average Hourly Rate
$20/hr
Minimal Budget
$10,000 - $25,000
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Start Mobile
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...
Top Services:
Mobile App Development
eCommerce Development
Location
Los Angeles, California
Number of Employees
Under 49
Average Hourly Rate
$35/hr
Minimal Budget
$1,000 - $10,000
View Profile
Beehive Software
Reimagining Software Development
Reimagining Software Development
Beehive is a new production model for software development (the world's first we should add) that fuses AI precision with human ingenuity. A model of collective intelligence that breaks projects into microtasks, routing them to global experts, and delivering production-ready, high quality, code faster than...
Top Services:
Web Development
Software Development
AI Development
Mobile App Development
IoT
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Location
San Jose, California
Number of Employees
100 - 249
Minimal Budget
$10,000 - $25,000
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5.0 5.0 (4)
Blue Trail Software
More Than Code We Build Trust Through Craft & Commitment
More Than Code We Build Trust Through Craft & Commitment
Engineered with integrity. Backed by mentorship. Delivered with care. BTS transforms ideas into scalable, secure, and impactful digital products that deliver long-term value...
Top Services:
Software Development
AI Development
Big Data Analytics
Mobile App Development
UI/UX Design
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Location
San Francisco, California
Number of Employees
100 - 249
Average Hourly Rate
$55/hr
Minimal Budget
$50,000 & Up
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Appnality
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...
Top Services:
Mobile App Development
Web Development
AI Development
VR/AR
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Location
Fremont, California
Number of Employees
50 - 99
Average Hourly Rate
$50/hr
Minimal Budget
$10,000 - $25,000
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4.3 4.3 (6)
Endertech
Beautiful & Functional Digital Solutions That Deliver ROI
Beautiful & Functional Digital Solutions That Deliver ROI
Endertech (endertech.com, 310.400.0800) is a full-service web and software development company near Los Angeles since the year 2000 providing custom design, e-commerce, software development, and online marketing support. “If you can dream it; We can build it”...
Top Services:
Digital Services
Web Development
Web Design
eCommerce Development
Software Development
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Location
Torrance, California
Number of Employees
Under 49
Average Hourly Rate
$150/hr
Minimal Budget
$1,000 - $10,000
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4.6 4.6 (19)
Eyfect Designs
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...
Top Services:
Web Design
Web Development
Mobile App Development
SEO
Digital Marketing
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Location
San Diego, California
Number of Employees
Under 49
Average Hourly Rate
$35/hr
Minimal Budget
$1,000 - $10,000
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Allusive Digital
Proven Excellence Through Custom Web Design and Development Services.
Proven Excellence Through Custom Web Design and Development Services.
Allusive Digital is a creative and marketing agency that helps businesses grow through branding, web design, content development, and digital marketing. The agency blends thoughtful strategy with polished creative execution to help clients increase visibility, strengthen their identity, and connect with their...
Top Services:
Web Development
eCommerce Development
Web Design
WordPress Website Design
AI Development
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Location
Los Angeles, California
Number of Employees
Under 49
View Profile
5.0 5.0 (5)
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Teamvoy
We Bring The Tech. You Get The Wins.
We Bring The Tech. You Get The Wins.
Teamvoy is an AI engineering and transformation partner. We help companies make smarter technology decisions and turn them into production-ready software...
Top Services:
Software Development
AI Development
Design Services
Web Design
UI/UX Design
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Location
Covina, California
Number of Employees
50 - 99
Average Hourly Rate
$50/hr
Minimal Budget
$10,000 - $25,000
View Profile
4.7 4.7 (29)
Phoenix Afterglow
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...
Top Services:
Web Design
Web Development
SEO
Mobile App Development
eCommerce
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Location
Irvine, California
Number of Employees
Under 49
Average Hourly Rate
$50/hr
Minimal Budget
$1,000 - $10,000
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5.0 5.0 (7)
Bay Area Coders
Strategy, design, engineering, and AI
Strategy, design, engineering, and AI
Bay Area Coders is a San Francisco-based product and engineering studio working with venture-backed startups and growth-stage companies since 2016. We combine strategy, design, engineering, and AI to help teams ship real products and modernize existing ones...
Top Services:
Software Development
Web Development
Mobile App Development
AI Development
Design Services
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Location
Roseville, California
Number of Employees
Under 49
Average Hourly Rate
$100/hr
Minimal Budget
$1,000 - $10,000
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Atlantis
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...
Top Services:
DevOps Consulting
Mobile App Development
Software Development
Blockchain
IoT
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Location
Newport Beach, California
Number of Employees
Under 49
Average Hourly Rate
$50/hr
Minimal Budget
$1,000 - $10,000
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devAtelier
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!...
Top Services:
Mobile App Development
Software Development
IoT
Web Development
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Location
San Diego, California
Number of Employees
Under 49
Average Hourly Rate
$125/hr
Minimal Budget
$10,000 - $25,000
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RSunBeat Software
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...
Top Services:
Web Development
UI/UX Design
Mobile App Development
Digital Marketing
Blockchain
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Location
California City, California
Number of Employees
Under 49
Average Hourly Rate
$15/hr
Minimal Budget
$1,000 - $10,000
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FACTn Software
Empowering Innovation, Connecting Excellence
Empowering Innovation, Connecting Excellence
FACTn Software, your trusted partner in software engineering outsourcing solutions. Founded with a passion for technological innovation and a commitment to excellence, FACTn Software is dedicated to providing top-tier software engineering talent to companies in the Scandinavian region and beyond...
Top Services:
Software Development
Mobile App Development
AI Development
Cloud Consulting
Managed Services
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Location
Los Angeles, California
Number of Employees
Under 49
Average Hourly Rate
$45/hr
Minimal Budget
$1,000 - $10,000
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5.0 5.0 (10)
Born West Inc.
We Build Digital Products, Experiences, And Systems ‍that Matter.
We Build Digital Products, Experiences, And Systems ‍that Matter.
Born West is a creative tech agency. We turn ambitious ideas into working software from inception to launch. Our senior strategists, designers, and engineers work as one team to shape digital products, AI-powered tools, platforms, and experiences that are thoughtful, scalable, and built to ship...
Top Services:
Product Design
Web Design
eCommerce Development
Web Development
WordPress Website Design
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Location
Concord, California
Number of Employees
Under 49
Average Hourly Rate
$200/hr
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Source Code Lab
Best Game Development Company in USA.
Best Game Development Company in USA.
Source Code Lab is the Best Custom Game Development Company in Usa/India.Our game developers build remarkable games compatible with the most popular platforms to attract the attention of a wider audience...
Top Services:
Graphic Design
IT Services
VR/AR
Mobile App Development
Wearables
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Location
San Francisco, California
Number of Employees
50 - 99
Average Hourly Rate
$25/hr
Minimal Budget
Under $1,000
Portfolios Count
1 Project Listed
View Profile
5.0 5.0 (8)
CloneAppz
White label & clone app development company
White label & clone app development company
CloneAppz delivers white label and clone app solutions that help businesses go live faster. We combine proven technology with smart customization to give you a platform that genuinely represents your brand and supports real growth...
Top Services:
Mobile App Development
Location
San Francisco, California
Number of Employees
50 - 99
Average Hourly Rate
$20/hr
Minimal Budget
$1,000 - $10,000
View Profile
MobMaxime
Top Mobile App and Web Development Company in Canada, USA and UK
Top Mobile App and Web Development Company in Canada, USA and UK
We design highly polished iPhone, Android and Web Apps for startups and Enterprise clients...
Top Services:
Mobile App Development
Web Development
UI/UX Design
IoT
Digital Marketing
Show more
Location
Sunnyvale, California
Number of Employees
50 - 99
Average Hourly Rate
$15/hr
Minimal Budget
$10,000 - $25,000
Portfolios Count
3 Projects Listed
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TechMave Software
You Think We Will Deliver
You Think We Will Deliver
TechMave Software LLP delivers innovative web, mobile, and AI solutions tailored to business needs. Our team combines creativity, technology, and strategy to build impactful digital products that empower brands globally...
Top Services:
Design Services
eCommerce Development
Web Development
AI Development
Mobile App Development
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Location
Mountain View, California
Number of Employees
50 - 99
Average Hourly Rate
$11/hr
Minimal Budget
$10,000 - $25,000
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5.0 5.0 (30)
Rytsense Technologies
Leading Global Digital Transformation
Leading Global Digital Transformation
Rytsense Technologies is an AI-driven technology company specializing in AI development services, machine learning solutions, and intelligent automation. We help businesses build advanced AI applications, integrate AI models into existing systems, and transform data into actionable insights...
Top Services:
AI Development
Mobile App Development
Software Development
Business Consulting
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Location
Mountain View, California
Number of Employees
100 - 249
Average Hourly Rate
$25/hr
Minimal Budget
Under $1,000
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5.0 5.0 (67)
Umang Software Technologies
UMANG means Enthusiasm; Enthusiasm is what drives the mankind!
UMANG means Enthusiasm; Enthusiasm is what drives the mankind!
Umang has been working with some of the elite organization across the globe to develop and maintain their existing legacy applications. They are experts in developing custom software/Mobile/Web applications.Umang has expertise in Delphi, Java, PHP, Python, DotNet and 20+ other technologies and has domain...
Top Services:
Software Development
Mobile App Development
Location
San Jose, California
Number of Employees
Under 49
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DS Technologies (Pvt.) Limited
Global Web Development & Digital Marketing Experts
Global Web Development & Digital Marketing Experts
DS Technologies is a global web design, development, and digital marketing agency. We specialize in creating innovative, custom solutions that drive measurable results. With expertise in SEO, UI/UX, and scalable web applications, we help businesses worldwide grow their digital presence and achieve sustainable...
Top Services:
Graphic Design
Web Design
eCommerce Development
Web Development
UI/UX Design
Show more
Location
Los Angeles, California
Number of Employees
Under 49
Average Hourly Rate
$25/hr
Minimal Budget
$1,000 - $10,000
View Profile
4.7 4.7 (27)
Altiux Innovations Pvt. Ltd.
We help accelerate your IoT!
We help accelerate your IoT!
Altiux Innovations is a software and product engineering services organization focused on helping you accelerate the development of your IoT solutions and products. We provide specialized engineering services across the entire IoT development cycle, from consulting, device engineering, cloud and mobility...
Top Services:
IoT
Software Development
Software Testing
Mobile App Development
AI Development
Show more
Location
Milpitas, California
Number of Employees
50 - 99
Minimal Budget
$1,000 - $10,000
Portfolios Count
1 Project Listed
View Profile
4.4 4.4 (50)
Persistent
See Beyond, Rise Above.
See Beyond, Rise Above.
Persistent Systems, a renowned global leader in software product development and technology services. Delve into our innovative offerings to stay ahead in the ever-evolving landscape of technology...
Top Services:
AI Development
Software Development
Web Development
Mobile App Development
Blockchain
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Location
Santa Clara, California
Number of Employees
1000 & Up
Average Hourly Rate
$100/hr
Minimal Budget
$50,000 & Up
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4.6 4.6 (730)
Opal Infotech
We Build Success Stories
We Build Success Stories
For over 2 decades, starting in 1998, we have been serving a global clientele with web design, web development, mobile app development & digital marketing services. Our expertise spans SEO, Google Ads, Alibaba minisites & ranking optimization & the ongoing maintenance of apps and websites across more than 75...
Top Services:
Web Design
eCommerce Development
Web Development
WordPress Website Design
Digital Marketing
Show more
Location
Dublin, California
Number of Employees
50 - 99
Average Hourly Rate
$50/hr
Minimal Budget
$10,000 - $25,000
View Profile
4.8 4.8 (212)
iCode49 Technolabs
4 Steps to Cloud 9
4 Steps to Cloud 9
iCode49 Technolabs stands out as a premier provider specializing in the meticulous development of cutting-edge iOS and Android mobile applications uniquely crafted for both startups and global brands. Our expertise lies in driving innovation within the ever-evolving mobile landscape, where we leverage our...
Top Services:
Mobile App Development
Software Development
Web Development
WordPress Website Design
eCommerce Development
Show more
Location
Los Angeles, California
Number of Employees
Under 49
Average Hourly Rate
$20/hr
Minimal Budget
$10,000 - $25,000
View Profile
5.0 5.0 (12)
TechnoBrains Business Solutions
Empowering Businesses Through Innovative Software Development
Empowering Businesses Through Innovative Software Development
TechnoBrains Business Solutions is a global software development and AI solutions company founded in 2009, delivering custom web, mobile, AI, and enterprise software solutions for startups, SMEs, and established enterprises worldwide. Headquartered in Ahmedabad, India, with a presence in the United States...
Top Services:
AI Development
Mobile App Development
Software Development
eCommerce Development
Web Development
Show more
Location
San Francisco, California
Number of Employees
50 - 99
Minimal Budget
$10,000 - $25,000
View Profile
4.8 4.8 (26)
Chipsy IT Services Pvt. Ltd.
Transform Your Business with Our End-to-End IT Solutions.
Transform Your Business with Our End-to-End IT Solutions.
Chipsy Information Technology Services Pvt Ltd. offers comprehensive IT solutions, including expert consulting, mobile app development (VitalBase is an ABDM-enabled hospital management information system), application development, school management systems, and DevOps services...
Top Services:
Mobile App Development
IT Services
Cloud Consulting
DevOps Consulting
Software Development
Show more
Location
San Francisco, California
Number of Employees
Under 49
Average Hourly Rate
$12/hr
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CONTUS Tech
Your Digital Growth Success Partner.
Your Digital Growth Success Partner.
CONTUS Tech stands as a prominent global authority in digital engineering services, heralded for its transformative impact on businesses worldwide. Our forte lies in crafting cutting-edge digital products, pioneering connected vehicle experiences, and spearheading next-generation streaming services that...
Top Services:
DevOps Consulting
IT Services
Mobile App Development
IoT
Digital Services
Show more
Location
Santa Clara, California
Number of Employees
250 - 499
Average Hourly Rate
$30/hr
Minimal Budget
$25,000 - $50,000
View Profile
4.0 4.0 (314)
Fourchain Technologies Private Limited
Redefine your Business Growth with Fourchain Technologies.
Redefine your Business Growth with Fourchain Technologies.
At Fourchain, we specialize in modernizing businesses by offering comprehensive digital transformation solutions like blockchain, artificial intelligence, fintech and application development services, all tailored to meet the specific pain points and unique needs of startups, mid-size, and enterprise...
Top Services:
Blockchain
Mobile App Development
AI Development
Location
Ontario, California
Number of Employees
Under 49
Average Hourly Rate
$30/hr
Minimal Budget
$1,000 - $10,000
View Profile
5.0 5.0 (21)
NextOlive
Grow with Technology.
Grow with Technology.
We have a Team of 100+ Skilled App Developers who thrive on rolling up their sleeves and solving your IT problems and meeting your business needs like APP Development, Software Development, Cloud Consulting, Generative AI Development, Cyber Security Services, Custom ERP Software Development, and Web...
Top Services:
AI Development
Mobile App Development
Software Development
Blockchain
Software Testing
Show more
Location
Irvine, California
Number of Employees
50 - 99
Average Hourly Rate
$25/hr
Minimal Budget
$10,000 - $25,000
View Profile
Invoxico Technologies
Crafting Websites, Creating Success!
Crafting Websites, Creating Success!
Invoxico Technologies is an adept company in web design and development, acknowledged for its proficiency in crafting customized digital solutions. Their expert team focuses on UI/UX design, web development, CMS development, eCommerce solutions, and mobile app development, and offers a complete range of...
Top Services:
Web Design
eCommerce Development
UI/UX Design
Web Development
WordPress Website Design
Show more
Location
La Puente, California
Number of Employees
Under 49
Average Hourly Rate
$30/hr
Minimal Budget
$1,000 - $10,000
View Profile
5.0 5.0 (10)
TST Technology
Your Trusted IT Consulting Company for Business Success.
Your Trusted IT Consulting Company for Business Success.
TST Technology is an IT consulting company that offers services such as UI/UX design, web and mobile app development, software development, and SaaS product development. They have completed over 40 projects across 15+ industries...
Top Services:
IT Services
UI/UX Design
Mobile App Development
Software Development
Web Development
Show more
Location
Los Angeles, California
Number of Employees
50 - 99
Average Hourly Rate
$50/hr
Minimal Budget
$1,000 - $10,000
View Profile
5.0 5.0 (22)
Dino Code LA
Custom Software, AI & Product Development
Custom Software, AI & Product Development
Dino Code LA helps startups and businesses build custom software, SaaS platforms, web and mobile applications, AI solutions, and automation systems designed around real business needs...
Top Services:
Software Development
AI Development
Mobile App Development
Web Development
UI/UX Design
Show more
Location
Marina del Rey, California
Number of Employees
Under 49
Average Hourly Rate
$45/hr
Minimal Budget
Under $1,000
View Profile
4.6 4.6 (3)
5.0 5.0 (7)

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Best Cross-Platform App Development Companies in California

Digital Transformation Agency.

Think Digital

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

Your Marketplace in a Month.

Reimagining Software Development

More Than Code We Build Trust Through Craft & Commitment

Forging Digital Realities.

Beautiful & Functional Digital Solutions That Deliver ROI

Experience Award Winning UX/UI Design From Us.

Proven Excellence Through Custom Web Design and Development Services.

We Bring The Tech. You Get The Wins.

Your Full Digital Development Experience.

Strategy, design, engineering, and AI

Straight hands. Hot heads.

Southern Californias Mobile App experts since 2009

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

Empowering Innovation, Connecting Excellence

We Build Digital Products, Experiences, And Systems ‍that Matter.

Best Game Development Company in USA.

White label & clone app development company

Top Mobile App and Web Development Company in Canada, USA and UK

You Think We Will Deliver

Leading Global Digital Transformation

UMANG means Enthusiasm; Enthusiasm is what drives the mankind!

Global Web Development & Digital Marketing Experts

We help accelerate your IoT!

See Beyond, Rise Above.

We Build Success Stories

4 Steps to Cloud 9

Empowering Businesses Through Innovative Software Development

Transform Your Business with Our End-to-End IT Solutions.

Your Digital Growth Success Partner.

Redefine your Business Growth with Fourchain Technologies.

Grow with Technology.

Crafting Websites, Creating Success!

Your Trusted IT Consulting Company for Business Success.

Custom Software, AI & Product Development

Related Services in California

Related Mobile App Development Specializations in California

Popular Services

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