We’ve researched and ranked the best HTML5 mobile app development agencies that build sophisticated and high-quality apps that help brands drive more loyal customers and sales. Compare listings by past work, reviews, cost and size to pick the best fit for you.
Best HTML5 App Developers
4 Companies-Rankings updated: September 03, 2026
All mobile app development firms on DesignRush have been assessed for their expertise, portfolio, and verified client reviews. Some listings may be paid.
Matellio is a leading software engineering studio, recognized globally for delivering intelligent solutions powered by Artificial Intelligence and Machine Learning. We specialize in developing customized AI solutions tailored to various needs of businesses under different industry verticals...
Top Services:
AI Development
IoT
DevOps Consulting
Cloud Consulting
Mobile App Development
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Location
Denver, Colorado
Number of Employees
250 - 499
Average Hourly Rate
$50/hr
Minimal Budget
$50,000 & Up
Portfolios Count
26 Projects Listed
Matellio Inc. Services
AI Development
IoT
DevOps Consulting
Cloud Consulting
Mobile App Development
Software Development
Web Design
Web Development
Big Data Analytics
Staff Augmentation
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Hewlett Packard Enterprise
Tracking Genie
Brideside
Air Fusion
vCard Global
Codexa
PTGI
INSPRO
NERVVE
GoShow
Data sourced from the agency's DesignRush profile
Matellio Inc. Reviews & Testimonials
Undisclosed CTO at V Card Global
4.7★
Web Development Review from Undisclosed
Matellio is one of the best organizations I have had a chance to work with. Their unique approach to becoming an integrated extension of our corporate programming staff provides us with the ability to design and implement solutions in an ever changing environment.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Dont settle for off-the-shelf. Expertly crafted & custom-tailored software from the USA.
K-Optional Software: where your success is our success. From secure solutions that scale to an uncompromising focus on return on investment, we're the company that delivers. Dont settle for off-the-shelf. Expertly crafted & custom-tailored software from the USA...
Top Services:
Mobile App Development
Software Development
AI Development
Location
New York City, New York
Number of Employees
Under 49
Average Hourly Rate
$200/hr
Minimal Budget
$50,000 & Up
K-Optional Software, LLC Services
Mobile App Development
Software Development
AI Development
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Viapath Technologies
AllModular Systems
Assemplify
University of Arkansas
University of Texas Austin
Flowty
RepairDispatch
Data sourced from the agency's DesignRush profile
K-Optional Software, LLC Reviews & Testimonials
Michael Levy President at Flowty
5.0★
Software Development Review from Michael Levy
Flowty is a blockchain-based platform providing various transaction services around NFTs. K-Optional wears many hats in support of Flowty including Front End, Back End, business strategy, SEO and more.The K-Optional team has been incredible to work with. They are proactive, supportive, smart, thoughtful and, most importantly, fit seamlessly into our team and company culture. To put it succinctly, we tried to hire them full-time...and then tried to buy their company to acqui-hire them.Some of their strengths include: reliability, responsiveness and creativity. There are many groups out there that can perform some version of the work we are looking for. There are not many groups that are responsive at all hours of the day, deliver consistently and able to present data-backed business strategies.
Jane Smarovozova Creative Director at McSwain
5.0★
Software Development Review from Jane Smarovozova
We collaborated with K-Optional to develop a custom inventory management dashboard tailored for real estate clients. We provided the creative vision and detailed designs, while their team focused on the software development, ensuring that every element was implemented perfectly. We worked hand-in-hand flawlessly, resulting in a sleek, user-friendly interface that not only looks great but functions seamlessly. The synergy between design and development allowed us to deliver a product that exceeded client expectations, combining aesthetics with powerful functionality.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
A top custom software development firm dedicated to delivering bespoke digital products that drive innovation and help you achieve your brand goals. A full-stack developer with expertise in every major platform and language, we design and deliver custom applications and host and maintain the solutions we...
Top Services:
Software Development
Mobile App Development
UI/UX Design
Software Testing
WordPress Website Design
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Location
Spring, Texas
Number of Employees
Under 49
Average Hourly Rate
$150/hr
Minimal Budget
$50,000 & Up
Espresso Moon Services
Software Development
Mobile App Development
UI/UX Design
Software Testing
WordPress Website Design
eCommerce Development
Web Development
AI Development
VR/AR
Cloud Consulting
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
DistributionNOW
Tesla
Nucor Steel
Everest Funeral Concierge
Flexitallic
Solvay Dental
Stream Realty
Wilson Perumal
Neuhaus Academy
SafeFleet
Data sourced from the agency's DesignRush profile
Espresso Moon Reviews & Testimonials
Bradley Collins Review from Google
5.0★
Bradley Collins's Review Sourced from Google
Working with the guys at Espresso Moon (Scott, Doug, Tim and Dwayne) was truly a great collaboration and experience. They didn't just throw a website together for us, they helped us to reinvent ourselves. They go out of their way to get to know you and your business to the fullest extent, and that is a quality that is not often seen. If I were to recommend a web design/hosting company to anyone, Espresso Moon would be the one and only name I give. Thank you for your service and support!
Meredyth Jones Review from Google
5.0★
Meredyth Jones's Review Sourced from Google
I worked primarily with Scott, Tim and Doug to build a fairly complicated site: Paypal/credit card payments, video training modules, a graded quiz, and issuance of a completion certificate. They were the only website company that invited me to an in-person meeting and that was tremendously helpful in me understanding how they work and them understanding my goals. Large Animal Consulting & Education launched 2 days ago and the site is running smoothly. I'm very happy with the site they designed (they also designed my logos) and am looking forward to using them to support and add to the site down the road.
Caleb Schallert Review from Google
5.0★
Caleb Schallert's Review Sourced from Google
Doug Wheeler is the owner of Espresso Moon and he has provided my small business excellent IT technical support for our website. His team helped me out by removing malicious code that was affecting my site right after the Heart Bleed epidemic last year. He got my site back up and running so i could continue business and save my online reputation. I would recommend Espresso Moon LLC to anyone in need of a new website or mobile application because they follow through with what they promise to do, on time and on budget. They are truly a pleasure to work with!
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Proposals