Top California iPhone App Development Companies

Our expert analysts researched and ranked the leading California iPhone app development companies that build customer-centric applications that engage and convert users into paying customers. Use our practical tool to filter listings by budget, size and reviews and select the best partner for your business needs.

Best iOS App Development Agency In California

11 Companies-Rankings updated: August 19, 2026

Every agency on DesignRush meets evaluation criteria around expertise and client feedback to empower informed choices. Some listings include paid partnerships.

Show Filters

United States × California ×

BitsWits
Where Exceptional Apps Are Just The Beginning
BitsWits guarantees app delivery in 4 weeks, building native iOS and Android apps alongside Flutter, React Native, AR/VR, blockchain, and mobile game solutions. With 10+ years in business, it has launched 1,200+ successful projects, served 100+ global clients, and won a Horizon Interactive Gold Award...
Location
Los Angeles, California
Number of Employees
100 - 249
Average Hourly Rate
$25/hr
Minimal Budget
$25,000 - $50,000
Portfolios Count
12 Projects Listed
BitsWits Services
Mobile App Development
Software Development
VR/AR
Blockchain
AI Development
Staff Augmentation
Web Development
Wearables
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
FitNow
Wisu
Soul Scribe
Grease Monkey
Beats
Data sourced from the agency's DesignRush profile
BitsWits Reviews & Testimonials
Sydney Malone Implementation Engineer at Translucent Services
5.0★
Mobile App Development Review from Sydney Malone
With the development of our Mobile App, BitsWits performed a fantastic job. Their team was quick to respond and produced a great application that runs smoothly on all platforms. We are quite happy with the result.
Benson Sung Founder at D2C Design
5.0★
Mobile App Development Review from Benson Sung
They created a Mobile app for Medical services, and patient management has changed greatly as a result. The app works well with our current systems, is safe, and is simple to use. Their team produced a top-notch product on schedule while paying close attention to our unique requirements. We are really pleased with their work and heartily recommend BitsWits to anyone in need of app development services.
Steve Garry Senior 3D Animator at Treehouse Digital
5.0★
Mobile App Development Review from Steve Garry
The outcomes of our collaboration with BitsWits to develop an Online Food delivery app were outstanding. Real-time tracking is integrated into the app, which makes it easy to use and has significantly enhanced our customer support. Their development staff was quick to respond and took care of all of our requests. We couldn't be more pleased with the result!
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Visit Website View Profile
5.0 5.0 (58)
5.0 5.0 (11)
Clay
Verified
Top UI/UX design, web design, and branding agency in San Francisco.
Clay is a design and development agency whose mobile app work spans branding, UX, interaction design, and emerging tech, including AI, AR/VR, and Web3. In 16 years, its 78-person senior-led team has completed 529 projects for clients including Meta, Google, Stripe, Coinbase, Uber, and Sony...
Location
San Francisco, California
Number of Employees
50 - 99
Average Hourly Rate
$175/hr
Portfolios Count
12 Projects Listed
Clay Services
UI/UX Design
Mobile App Development
Web Development
Branding
Web Design
Video Production
Product Design
Graphic Design
Logo Design
Design Services
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Meta
Google
Discover
Stripe
Coca-Cola
Coinbase
Uber
Sony
Slack
Amazon
Data sourced from the agency's DesignRush profile
Clay Reviews & Testimonials
Anonymous Co-Founder at Skylum
5.0★
Web Development Review from Anonymous
Clay built our new website to support a product launch, and we were impressed by how quickly they delivered. The site met our expectations perfectly. They worked efficiently and provided high-quality results right on schedule.
Anonymous Manager at Car Retailer
5.0★
Web Design Review from Anonymous
Clay designed and developed our car retail website, and the results were outstanding. The site looked stunning and worked exactly as needed. They stood out for their patience, attentiveness, and excellent service. Communication was always clear, and they delivered on time.
Anonymous Director of Web Strategy & Operations at Nonprofit Org
5.0★
Web Design Review from Anonymous
Clay redesigned and rebuilt our nonprofit’s website with fresh UX/UI research to guide the process. The new site improved conversions, earned great user feedback, and boosted internal efficiency. Communication across all channels was seamless, and their responsiveness and high-quality results went beyond what we expected.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Visit Website View Profile
4.9 4.9 (37)
4.8 4.8 (21)
Koderspedia
Transform Fast: Your App on iOS & Android Awaits!
Through Koderspedia, clients gain a mobile app development company partner with a proven record—millions of downloads, funded launches, and seamless UI/UX. Our strategic thinking leads to remarkable outcomes in iOS, Android, and cross-platform app innovation. Submit your RFP today...
Location
Palo Alto, California
Number of Employees
Under 49
Minimal Budget
$1,000 - $10,000
Portfolios Count
13 Projects Listed
Koderspedia Services
Web Design
Web Development
Mobile App Development
Software Development
Logo Design
WordPress Website Design
eCommerce Development
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
The ALS Guide
Accenture
Stadis
EventBuddy
Teachers DIrect
Munich Re
Comcast
ViacomCBS
intel
Coca*Cola
Data sourced from the agency's DesignRush profile
Koderspedia Reviews & Testimonials
Jason Troyan Real Estate Broker at Live Florida Realty
5.0★
Web Development Review from Jason Troyan
We discovered Koderspedia through an online search, and it turned out to be one of the best decisions we've made for our real estate company's web development!The team at Koderspedia, particularly Peter, demonstrated exceptional professionalism, expertise, and dedication to delivering top-notch results. Peter's communication skills are outstanding- he was always available, responsive, and ensured we were on the same page throughout the project.The final product exceeded our expectations- a stunning, user-friendly, and highly functional website that perfectly represents our brand. Koderspedia's attention to detail, creativity, and technical prowess are truly impressive.We wholeheartedly recommend their services and appreciate the fantastic work they've done for us!Thank you, Peter and the Koderspedia team!
Nina Di Carlo Managing Director at Guards Real Estate
5.0★
Web Design Review from Nina Di Carlo
Koderspedia' work was easy to implement, and we saw a 95% increase in sales and traffic after the site's launch. The Peter and the team communicated well and provided constant updates throughout. Their web design expertise and strong project ownership made for a fruitful engagement.
Betty Rodrigues Regional HR Manager at Gameloft Montreal
5.0★
Web Development Review from Betty Rodrigues
Koderspedia delivered an exceptional web app for Gamesoft Montreal Company! Their team, led by Peter, showcased outstanding expertise and communication skills. Peter's prompt responses and clear updates ensured a seamless project experience. The final product exceeded our expectations- visually stunning, functional, and secure. Highly recommend Kordespedia for web app development!
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Visit Website View Profile
4.9 4.9 (18)
4.9 4.9 (31)

ZERO NEGATIVE
Verified
Boutique studio creating tailored web experiences.
Reach for the sky. We are Zero Negative. Your sidekick for big ideas. In a nutshell, Zero Negative is a small, boutique full-service design and development studio with a focus on creativity and close collaboration with clients. We make stuff - websites, web apps, interactive experiences, branding, and...
Location
San Francisco, California
Number of Employees
Under 49
Minimal Budget
$25,000 - $50,000
Portfolios Count
7 Projects Listed
ZERO NEGATIVE Services
Web Development
Web Design
WordPress Website Design
Branding
UI/UX Design
Graphic Design
Digital Services
Mobile App Development
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Mercedes-Benz
United Nations Development Programme
KFC
Vodafone Foundation
GS1
Conad
Curative Biotech
Data sourced from the agency's DesignRush profile
ZERO NEGATIVE Reviews & Testimonials
Jaroslav Tyman Jr. General Manager at Automation IG
5.0★
Web Development Review from Jaroslav Tyman Jr.
We contacted Zero Negative about a two stage renewal of our company website with a very aggressive timeline for the first stage. Zero Negative worked and guided us through pulling off the first stage within our timeline while also ensuring that the content and ideas for that stage were readily applicable to the full design. When we got to the full design, they were fully responsible for corralling the various preferences and ideas from our team into a well executed cohesive site. We're now in a good spot and look forward to continuing to work with Zero Negative as our business and needs grow.
Susan E. Roberts Principal at Roberts Communications
5.0★
Web Development Review from Susan E. Roberts
Zero Negative did an exceptional job designing my website, roberts-communications.com. From the start, they understood that this wasn't just about aesthetics it was about positioning, credibility, and clarity for a senior-level communications brand.They translated a complex, high-stakes business into a site that feels polished, modern, and authoritative without being flashy or over designed. The process was collaborative, efficient, and thoughtful, and they were responsive to feedback while also offering smart guidance when it mattered.The final result reflects exactly how I want Roberts Communications to be perceived: strategic, sophisticated, and trusted. I would highly recommend Zero Negative to anyone looking for a design partner who understands brand, not just web building.
Anonymous President at OTEC Manufacturing
5.0★
Web Development Review from Anonymous
These guys are the best! We engaged with Zero Negative to develop a comprehensive web-based system for our factory that allows for managing orders, processes, and inventory. This initiative was essential for us to secure a big ticket client. We truly could not have accomplished this without their assistance. They dedicated considerable time to on-boarding and collecting the requisite information, followed by prototyping the software, and ultimately developing it from scratch. Overall, we are very satisfied.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Visit Website View Profile
4.9 4.9 (10)
5.0 5.0 (2)
Ptolemay
IT Solutions for Promising Businesses
We are a full-cycle IT development company that designs and creates perfect solutions based in the US with HQ in Walnut, California. Our experience in diverse marketplaces allows us to offer high-level service to our clients with a clear understanding of their need for flexibility, speed, and agility...
Location
Walnut, California
Number of Employees
50 - 99
Average Hourly Rate
$50/hr
Minimal Budget
$10,000 - $25,000
Portfolios Count
4 Projects Listed
Ptolemay Services
Mobile App Development
Software Development
AI Development
UI/UX Design
Web Development
Staff Augmentation
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Samsung
Knauf
Tilda RetailCRM
Coca-Cola
Roonyx INC
Sola
Technaxis
Arsidian LLC
Cumulative Business Solutions LLC
Tegen LLC
Data sourced from the agency's DesignRush profile
Ptolemay Reviews & Testimonials
Vladimir Drogan ceo at roonyx
5.0★
Mobile App Development Review from Vladimir Drogan
They are the top app developers Ive ever worked withI'm most impressed with Ptolemay's ability to properly plan the process, manage their work, and communicate early about what it will take. They're clearly experienced, understand what's needed, and are truthful and honest about it. With Ptolemay, I don't have to worry about the ongoing process since all updates are easy to access.
Ekaterina Rebus Marketing Manager at MetaLamp
4.8★
Mobile App Development Review from Ekaterina Rebus
They are true experts in mobile app development!The most important thing to us when working with any company is that they take responsibility for the work they do and show a high level of expertise in their field. We have never worked with a company that has demonstrated such dedication to their craft as Ptolemay. They have always shown up prepared and ready to get started on the project at hand, and they have even gone above and beyond in order to produce exceptional products.
Анастасия Головенко Review from Google
5.0★
Анастасия Головенко's Review Sourced from Google
We cooperate with Ptolemay for the last couple of years in terms of outstaffing demands. As we have already worked on more than 6 big projects, they have proven themselves as a reliable partner that provide high quality developers. Despite the difficulty of the position we need, they are always ready to involve their team to help us cover the demand. Even though any cooperation tend to have its own issues and misunderstanding, the Ptolemays’ team has always been open for resolving problems and finding compromise
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Visit Website View Profile
4.4 4.4 (2)
5.0 5.0 (10)
Pastilla
For People. For Progress.
Pastilla is a full-service agency based in Los Angeles. We partner with public agencies, nonprofits, and global brands to turn complex missions into clear brand and digital experiences that build trust and move communities to action...
Location
Los Angeles, California
Number of Employees
Under 49
Average Hourly Rate
$185/hr
Minimal Budget
$50,000 & Up
Portfolios Count
18 Projects Listed
Pastilla Services
Branding
Design Services
Graphic Design
Web Design
Web Development
Mobile App Development
Digital Marketing
Social Media Marketing
Content Marketing
Video Production
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
City of LA Recreation & Parks
Black Girls Code
Sacramento Public Library
Consumer Technology Association
Clean Power Alliance
Microsoft
Metrolink
Hollywood Foreign Press Associations (HFPA)
Disney
Lossan
Data sourced from the agency's DesignRush profile
Visit Website View Profile
5.0 5.0 (3)

Double Coconut
We Build Games That Players Love.
Double Coconut is a San Franciscobased boutique game development studio founded in 2012. The agency specializes in full-service game design and co-developmentfrom casual mobile and web titles to casino, mid-core, and Web3 games. Their projects have reached over 5 million players and generated...
Location
San Francisco, California
Number of Employees
50 - 99
Average Hourly Rate
$25/hr
Minimal Budget
$10,000 - $25,000
Portfolios Count
8 Projects Listed
Double Coconut Services
Software Development
Web Design
Mobile App Development
Blockchain
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Microsoft
WB
Cartoon Network
Ellen Degeneres
MIT
IBM
SAP
iWin
Addicting Games
Penn Gaming
Data sourced from the agency's DesignRush profile
Visit Website View Profile
XWEBAGENCY
We Design Develop Host & Maintain Your Online Presence
XWebAgency, Your trusted web agency. We offer website design, web development, SEO services, digital marketing, and e-commerce solutions to help your business grow online...
Location
Desert Hot Springs, California
Number of Employees
Under 49
Average Hourly Rate
$55/hr
Minimal Budget
Under $1,000
Portfolios Count
4 Projects Listed
XWEBAGENCY Services
Digital Marketing
Mobile App Development
Web Design
SEO
eCommerce Development
WordPress Website Design
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
eCommerce Industry
Fashion Industry
Beauty Industry
Data sourced from the agency's DesignRush profile
Visit Website View Profile
ArcTouch
Desig & Develop Top-Notch Digital Products
We are trusted by businesses of all sizes to design and develop their digital products...
Location
San Francisco, California
Number of Employees
100 - 249
Average Hourly Rate
$149/hr
Minimal Budget
$50,000 & Up
ArcTouch Services
UI/UX Design
Digital Marketing
Mobile App Development
IoT
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
McCormick
HP Printables
Lightship RV
Data sourced from the agency's DesignRush profile
ArcTouch Reviews & Testimonials
Vinit Bhagwat Review from Google
5.0★
Vinit Bhagwat's Review Sourced from Google
5 steps to a blockchain proof of concept (POC) is very nice guide to start blockchain project POC, it gives clear direction about the POC and explains in depth what is required at each step to have successful POC.
Eric Shapiro Review from Google
5.0★
Eric Shapiro's Review Sourced from Google
One of the original app developers still going strong after 10 years, building lovable apps for the Fortune 500, world-class brands, and innovative startups.
Vanessa Jespersen-Wheat Review from Google
5.0★
Vanessa Jespersen-Wheat's Review Sourced from Google
ArcTouch is top-notch. They are experts in their field with a track record to prove it. Not only do they deliver the highest quality work, but they are true partners all along the way.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Visit Website View Profile
5.0 5.0 (25)
Ozodeck Inc.
We Design Modern Creative Websites
We provide excellent solution with modern and trendy design for Website and Mobile app. Give a touch of modern solution to your business...
Location
Los Angeles, California
Number of Employees
Under 49
Average Hourly Rate
$60/hr
Minimal Budget
$1,000 - $10,000
Portfolios Count
1 Project Listed
Ozodeck Inc. Services
Web Design
Web Development
UI/UX Design
WordPress Website Design
eCommerce Development
Branding
Digital Services
SEO
Digital Marketing
Email Marketing
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Lakefall Gear
Hamada Construction
Grim Vision
Satori Graphics
Data sourced from the agency's DesignRush profile
Ozodeck Inc. Reviews & Testimonials
Felix Review from Google
5.0★
Felix's Review Sourced from Google
Ozodeck just delivered perfectly! He made my website based on a complex wordpress theme, including video, made tons of customizations, followed every wish I had perfectly. i am really happy. Later support and further adjustments, also no problem. 100 Percent Recommendation!
Emma G Review from Google
5.0★
Emma G's Review Sourced from Google
Ozodeck delivered a very good website that matched our expectations, They did all the changes we asked for and created a website that matched our brand identity. Very highly recommended. We will chose Ozodeck for any future web design and development services. Thanks Ozodeck!
Carrie Huang Review from Google
5.0★
Carrie Huang's Review Sourced from Google
Building a website is hard enough. You have to get it right the first time because it's going to represent who you are and your reputation. That's why I didn't hesitate to work with Ozodeck. Based on their previous work, I knew I had confidence in this company to create my first WordPress website. Not only did Ozodeck deliver exactly everything I wanted, but they gave me even better suggestions. Their expertise and communication made this whole process a pleasant experience. So if you want a web designer/developer who you can 100% trust, you don't have to look any further. Ozodeck can overdeliver and make sure you have a great experience.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Visit Website View Profile
5.0 5.0 (4)
Need Help Selecting The Right iPhone App Development Agency in California For Your Project?
We'll Find The Best Agencies For You.
TELL US ABOUT YOUR PROJECT
Handmade Interactive LLC
Compelling Design Meets Robust Usability.
Since 2003 we have developed bespoke websites and mobile apps for industry, government, and non-profits. From the beginning, our philosophy has been that everything we build must combine compelling design with high usability and robust security...
Location
Pasadena, California
Number of Employees
Under 49
Average Hourly Rate
$75/hr
Minimal Budget
$1,000 - $10,000
Handmade Interactive LLC Services
Web Development
Mobile App Development
AI Development
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
The Arroyos
Robert Kaufman Co., Inc.
Institute For Girls' Development
Data sourced from the agency's DesignRush profile
Handmade Interactive LLC Reviews & Testimonials
Same Day Mold Testing Review from Google
1.0★
Same Day Mold Testing's Review Sourced from Google
I don't recommend this company. Mark Slater is hardly ever available. No one else in the office knows his whereabouts. He's nice enough in person, but good luck reaching him. It's been 90 days (and counting) since he signed a contract saying a product would be complete in 30 days. He cashed the initial deposit check after weeks of having it in his possession. Poor customer service, hasn't delivered on his promise. And really don't know his competency because there is a minimal online presence. Unfortunately, this seems to be another case of a hack job offering services that can't be delivered a.k.a. SCAM!
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Visit Website View Profile
1.0 1.0 (1)

Related Services in California

Related Mobile App Development Specializations in California

Popular Services

Latest Trends Related to iPhone App Development

App Development

iPhone vs. Android: 60+ Key Market Statistics Every Business Should Know

20,316

App Development

I Tested the Top 5 Mobile App Development AI Tools: Here’s What Stood Out

38,761

App Development

Top 5 No-Code App Builders Reviewed — Which One Came Out on Top?

26,924

Best iOS App Development Agency In California

Where Exceptional Apps Are Just The Beginning

BitsWits Services

BitsWits Reviews & Testimonials

Top UI/UX design, web design, and branding agency in San Francisco.

Clay Services

Clay Reviews & Testimonials

Transform Fast: Your App on iOS & Android Awaits!

Koderspedia Services

Koderspedia Reviews & Testimonials

Boutique studio creating tailored web experiences.

ZERO NEGATIVE Services

ZERO NEGATIVE Reviews & Testimonials

IT Solutions for Promising Businesses

Ptolemay Services

Ptolemay Reviews & Testimonials

For People. For Progress.

Pastilla Services

We Build Games That Players Love.

Double Coconut Services

We Design Develop Host & Maintain Your Online Presence

XWEBAGENCY Services

Desig & Develop Top-Notch Digital Products

ArcTouch Services

ArcTouch Reviews & Testimonials

We Design Modern Creative Websites

Ozodeck Inc. Services

Ozodeck Inc. Reviews & Testimonials

Compelling Design Meets Robust Usability.

Handmade Interactive LLC Services

Handmade Interactive LLC Reviews & Testimonials

Related Services in California

Related Mobile App Development Specializations in California

Popular Services

Latest Trends Related to iPhone App Development

ReceiveProposals