Best California Startup App Development Companies

338 Companies - Rankings updated: April 01, 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.

United States × California ×

SEOFAT
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
View Profile
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 [... view Allusive Digital profile ]
Location
Los Angeles, California
Number of Employees
Under 49
View Profile
5.0 5.0 (5)
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 [... view Beehive Software profile ]
Location
San Jose, California
Number of Employees
100 - 249
Minimal Budget
$10,000 - $25,000
View Profile
5.0 5.0 (3)
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 [... view Staydify Systems profile ]
Location
San Francisco, California
Number of Employees
100 - 249
Average Hourly Rate
$10/hr
Minimal Budget
Under $1,000
View Profile
WebVello
Design. Develop. Dominate.
Design. Develop. Dominate.
A modern digital studio building high-performance websites, SEO systems, and growth platforms for brands that want real results not just visuals. [... view WebVello profile ]
Location
Roseville, California
Number of Employees
Under 49
Average Hourly Rate
$55/hr
Minimal Budget
$1,000 - $10,000
View Profile
5.0 5.0 (15)
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. [... view FACTn Software profile ]
Location
Los Angeles, California
Number of Employees
Under 49
Average Hourly Rate
$45/hr
Minimal Budget
$1,000 - $10,000
View Profile
5.0 5.0 (6)
Kingdom Vision
We Build Cool Stuff With Cool People...
We Build Cool Stuff With Cool People...
Kingdom Vision is a digital agency specializing in web design, web development, and custom software solutions for businesses and startups. The company offers a range of services including mobile app development, CMS development, branding, and digital marketing to help clients build and grow their online [... view Kingdom Vision profile ]
Location
San Jose, California
Number of Employees
Under 49
Average Hourly Rate
$25/hr
Minimal Budget
Under $1,000
View Profile
DigiTec Studio
Top Digital Marketing Agency In USA
Top Digital Marketing Agency In USA
DigiTec Studio Top digital marketing agency in USA offering SEO, web design, branding, and results-driven solutions. See how we can help your business grow. [... view DigiTec Studio profile ]
Location
Glendale, California
Number of Employees
50 - 99
Average Hourly Rate
$50/hr
Minimal Budget
$10,000 - $25,000
View Profile
5.0 5.0 (1)
Ambsan Digital
Building the Future, Code At A Time
Building the Future, Code At A Time
Ambsan Digital is a full stack company specializing in high-performance web and mobile app development. We transform ideas into scalable digital products, offering end-to-end services from UI/UX design and custom web platforms to native and cross-platform mobile applications. Our expert developers focus on [... view Ambsan Digital profile ]
Location
California City, California
Number of Employees
Under 49
Average Hourly Rate
$50/hr
Minimal Budget
$1,000 - $10,000
View Profile
iQlance Solutions Canada
Canadas Trusted Partner
Canadas Trusted Partner
iQlance Solutions Canada is a global technology service provider specializing in delivering advanced digital products tailored to modern business needs. The company focuses on building scalable, secure, and high-performance solutions, helping organizations turn their ideas into successful digital platforms. [... view IQlance Solutions Canada profile ]
Location
Ontario, California
Number of Employees
50 - 99
Minimal Budget
$10,000 - $25,000
View Profile
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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. [... view Blue Trail Software profile ]
Location
San Francisco, California
Number of Employees
100 - 249
Average Hourly Rate
$55/hr
Minimal Budget
$50,000 & Up
View Profile
Onething Design
Global Award Winning UX UI Design Company
Global Award Winning UX UI Design Company
At Onething Design, our focus is on excelling in a singular domain. Renowned for our exceptional expertise in UX UI design services, we were honored with the Best Design Agency award in 2022. However, it's our enduring passion for design and the praise received from our clients that drive our continual [... view Onething Design profile ]
Location
San Francisco, California
Number of Employees
100 - 249
Average Hourly Rate
$49/hr
Minimal Budget
$1,000 - $10,000
Portfolios Count
7 Projects Listed
View Profile
4.3 4.3 (19)
AlgoRepublic
Our expertise makes a positive impact to your business
Our expertise makes a positive impact to your business
AlgoRepublic offers comprehensive business automation, product development, and software/web development services to clients globally. Our expertise ensures innovative and efficient solutions tailored to meet the diverse needs of businesses worldwide. [... see all AlgoRepublic reviews ]
Location
Los Angeles, California
Number of Employees
250 - 499
Average Hourly Rate
$30/hr
Minimal Budget
Under $1,000
Portfolios Count
1 Project Listed
View Profile
4.3 4.3 (1)
4.8 4.8 (18)
Creatiosoft Solutions Private Limited
Your Ultimate Partner in Poker Game Evolution.
Your Ultimate Partner in Poker Game Evolution.
Creatiosoft is a leading poker game development company specializing in creating immersive, innovative, and scalable poker solutions. Since 2012, weve delivered world-class gaming experiences powered by cutting-edge technology, including blockchain and AI integration. With a global client base spanning the [... view Creatiosoft Solutions Private Limited profile ]
Location
Mountain View, California
Number of Employees
50 - 99
Average Hourly Rate
$20/hr
Minimal Budget
$50,000 & Up
Portfolios Count
1 Project Listed
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. [... view MobMaxime profile ]
Location
Sunnyvale, California
Number of Employees
50 - 99
Average Hourly Rate
$15/hr
Minimal Budget
$10,000 - $25,000
Portfolios Count
3 Projects Listed
View Profile
EpicBliss
EpicBliss Solutions provides a variety of IT services.
EpicBliss Solutions provides a variety of IT services.
Many worldwide clients are now using "EpicBliss" benchmark solutions, We're capable to drive you to the right tech-track for your laudable idea. So, let's scrutinize your business need, mold it and establish it with the latest and most suitable technologies. [... see all EpicBliss reviews ]
Location
Ontario, California
Number of Employees
Under 49
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4.3 4.3 (1)
5.0 5.0 (36)
VOCSO Technologies
Reimagine Growth With Cutting-Edge App Development
Reimagine Growth With Cutting-Edge App Development
VOCSO Technologies is an ISO 27001 certified web and mobile solutions company based in India, USA, and UAE. VOCSO Technologies is a one-stop web and mobile solutions agency, offers website design and development, mobile application design & development, and digital marketing services. [... view VOCSO Technologies profile ]
Location
Orange County, California
Number of Employees
Under 49
Average Hourly Rate
$50/hr
Minimal Budget
Under $1,000
Portfolios Count
1 Project Listed
View Profile
4.1 4.1 (56)
Dreamer Technoland
Full Cycle Software & Mobile App Development Company.
Full Cycle Software & Mobile App Development Company.
Dreamer Technoland is a web development, mobile app design and development company building reliable solutions for businesses and startups. [... view Dreamer Technoland profile ]
Location
Alameda, California
Number of Employees
Under 49
Average Hourly Rate
$25/hr
Minimal Budget
$25,000 - $50,000
Portfolios Count
3 Projects Listed
View Profile
4.4 4.4 (28)
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 [... view Altiux Innovations Pvt. Ltd. profile ]
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)
Appther
Transforms Digital Idea Into Reality
Transforms Digital Idea Into Reality
Appther is a software and mobile app development company creating intelligent, scalable, and user-friendly digital solutions powered by innovation and AI. [... view Appther profile ]
Location
Signal Hill, California
Number of Employees
50 - 99
Average Hourly Rate
$22/hr
Minimal Budget
$10,000 - $25,000
Portfolios Count
1 Project Listed
View Profile
4.7 4.7 (23)
Rainstreamweb
Where Business Gets Success
Where Business Gets Success
Rainstream Technologies is a website design and development company based in India that has been providing professional services since 2014, with an extensive portfolio of over 500+ projects. [... view Rainstreamweb profile ]
Location
Ontario, California
Number of Employees
Under 49
Average Hourly Rate
$25/hr
Minimal Budget
$1,000 - $10,000
View Profile
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 [... view DS Technologies (Pvt.) Limited profile ]
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)
RW Infotech
A Headless Commerce Agency
A Headless Commerce Agency
RW Infotech is a Dubai-based digital agency specializing in custom web development, headless CMS integration, and scalable digital solutions. Founded in 2012 and originally established in India, they now have operations in Dubai, USA, and Australia, serving clients globally. [... view RW Infotech profile ]
Location
San Francisco, California
Number of Employees
Under 49
Average Hourly Rate
$30/hr
Minimal Budget
$1,000 - $10,000
View Profile
3.7 3.7 (75)
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. [... view Source Code Lab profile ]
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)
Gamecrio Studios
Shaping the future of Games.
Shaping the future of Games.
Gamecrio Studios is the best Game Design - Development company in USA & India with 8+ years of experience in game Design & development. [... view Gamecrio Studios profile ]
Location
San Francisco, California
Number of Employees
50 - 99
Average Hourly Rate
$18/hr
Minimal Budget
$1,000 - $10,000
Portfolios Count
1 Project Listed
View Profile
4.3 4.3 (43)
SoftGrid Computers
Innovate, Create, Excel.
Innovate, Create, Excel.
SoftGrid Computers is a prominent custom software development company that excels in blending the latest technologies with well-organized creative work. With a strong focus on understanding client needs and delivering optimal solutions, we strive to be a reliable partner that offers great value for money. Our [... view SoftGrid Computers profile ]
Location
Santa Monica, California
Number of Employees
100 - 249
Average Hourly Rate
$49/hr
Minimal Budget
$1,000 - $10,000
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 [... view Invoxico Technologies profile ]
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)
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 [... view Fourchain Technologies Private Limited profile ]
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)
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. [... view Chipsy IT Services Pvt. Ltd. profile ]
Location
San Francisco, California
Number of Employees
Under 49
Average Hourly Rate
$12/hr
View Profile
Developer Bazaar
Developer Bazaar provides comprehensive web and mobile app development services to transform businesses digitally. [... view Developer Bazaar profile ]
Location
Fremont, California
Number of Employees
Under 49
Average Hourly Rate
$30/hr
Minimal Budget
$1,000 - $10,000
View Profile
4.8 4.8 (26)
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 [... view NextOlive profile ]
Location
Irvine, California
Number of Employees
50 - 99
Average Hourly Rate
$25/hr
Minimal Budget
$10,000 - $25,000
View Profile
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. [... view TST Technology profile ]
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)
H.R Software Solutions Pvt. Ltd.
Innovate, Code, Elevate Transforming Ideas into Reality.
Innovate, Code, Elevate Transforming Ideas into Reality.
H.R. Software Solutions Pvt. Ltd. is a leading IT company offering cutting-edge software development, web solutions, and digital marketing services. We specialize in ERP, CRM, mobile app development, and AI-driven solutions for businesses of all sizes. With a customer-centric approach, we deliver innovative [... view H.R Software Solutions Pvt. Ltd. profile ]
Location
Ontario, California
Number of Employees
Under 49
Average Hourly Rate
$30/hr
Minimal Budget
$10,000 - $25,000
View Profile
Nextwebi It Solutions Pvt Ltd
Imagination Meets Implementation
Imagination Meets Implementation
We are one stop solution for all your digital needs. We follow a structured and agile development approach with project management planner to ensure the successful delivery of every project, focusing on quality, cost-optimization, transparency, and client satisfaction. [... view Nextwebi It Solutions Pvt Ltd profile ]
Location
San Francisco, California
Number of Employees
50 - 99
Average Hourly Rate
$20/hr
Minimal Budget
$1,000 - $10,000
View Profile
Squareboat
Design Driven Success
Design Driven Success
Squareboat is a design-first software development company with offices in India and the US. Through our Crewmate division, we help global businesses hire top remote developers and build fast, scalable digital products. [... view Squareboat profile ]
Location
San Francisco, California
Number of Employees
50 - 99
Average Hourly Rate
$30/hr
Minimal Budget
$25,000 - $50,000
View Profile
4.4 4.4 (256)
ByteBotix InfoTech LLP
Your Business Cataylst
Your Business Cataylst
ByteBotix InfoTech LLP is the top service provider, We focus on Industrial and web intelligence, Web and Mobile Applications and IOT based products. Whether you are a small , medium or largescale company we have got covered you all. What makes us stand out is that we deliver secured, standard and cost [... view ByteBotix InfoTech LLP profile ]
Location
Vacaville, California
Number of Employees
Under 49
Average Hourly Rate
$25/hr
Minimal Budget
Under $1,000
View Profile
Kaaspro
Accelerating Business Growth Through Technology
Accelerating Business Growth Through Technology
Kaaspro Solutions is a full-stack IT and product engineering company helping businesses accelerate digital transformation. We specialize in custom software, HRMS & payroll platforms, mobile & web apps, cloud solutions, and AI-driven innovations to build scalable, reliable, and future-ready technology. [... view Kaaspro profile ]
Location
Menlo Park, California
Number of Employees
Under 49
Average Hourly Rate
$25/hr
Minimal Budget
$1,000 - $10,000
View Profile
4.5 4.5 (11)
Rytsense Technologies
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. Our expertise [... view Rytsense Technologies profile ]
Location
California City, California
Number of Employees
100 - 249
Average Hourly Rate
$25/hr
Minimal Budget
Under $1,000
View Profile
5.0 5.0 (64)

Related Services in California

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About The Author and Expert Reviewer

Selina Garcia

Content Specialist

selina@designrush.com

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.

Sergio Oliveira

Former Development Director

spotlight@designrush.com

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.

Latest Trends Related to Startup App Development

App Development

Best California Startup App Development Companies

Elite Services That Multiply Revenue

Proven Excellence Through Custom Web Design and Development Services.

Reimagining Software Development

Empowering Your Business Growth With Precision

Design. Develop. Dominate.

Empowering Innovation, Connecting Excellence

We Build Cool Stuff With Cool People...

Top Digital Marketing Agency In USA

Building the Future, Code At A Time

Canadas Trusted Partner

More Than Code We Build Trust Through Craft & Commitment

Global Award Winning UX UI Design Company

Our expertise makes a positive impact to your business

Your Ultimate Partner in Poker Game Evolution.

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

EpicBliss Solutions provides a variety of IT services.

Reimagine Growth With Cutting-Edge App Development

Full Cycle Software & Mobile App Development Company.

We help accelerate your IoT!

Transforms Digital Idea Into Reality

Where Business Gets Success

Global Web Development & Digital Marketing Experts

A Headless Commerce Agency

Best Game Development Company in USA.

Shaping the future of Games.

Innovate, Create, Excel.

Crafting Websites, Creating Success!

Redefine your Business Growth with Fourchain Technologies.

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

Grow with Technology.

Your Trusted IT Consulting Company for Business Success.

Innovate, Code, Elevate Transforming Ideas into Reality.

Imagination Meets Implementation

Design Driven Success

Your Business Cataylst

Accelerating Business Growth Through Technology

Related Services in California

Related Mobile App Development Specializations in California

About The Author and Expert Reviewer

Latest Trends Related to Startup App Development