Explore leading software testing companies that launch high-performing products, detect bugs early, improve stability, and ensure every feature works correctly across devices and environments. For teams focused on the US market, we also highlight trusted partners with region-specific expertise, including top US-based software testing companies.
Best Software Testing Firms
10 Companies-Rankings updated: September 03, 2026
Every agency on DesignRush has been evaluated for its expertise and client feedback to empower informed choices. Some listings include paid partnerships.
Award Winning Custom Development Experts | ERP Integration | Shopify/BigCommerce
QOLOS (pronounced "koh-lohs") is a U.S.-based software development company, specializing in building custom,
high-performance digital solutions for brands that demand innovation.
From complex ERP integrations to e-commerce solutions - you are in good hands with QOLOS...
Top Services:
Web Development
eCommerce Development
WordPress Website Design
Software Development
UI/UX Design
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Location
Green Bay, Wisconsin
Number of Employees
50 - 99
Average Hourly Rate
$150/hr
Minimal Budget
$50,000 & Up
QOLOS Services
Web Development
eCommerce Development
WordPress Website Design
Software Development
UI/UX Design
SEO
Software Testing
Mobile App Development
ERP Consulting
DevOps Consulting
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Thermos
Certco
Stryker
Louisville Vegan Jerky
Dallas Morning News
Dallas Police Department
Bancroft and Sons
Schneider National
Cocktail Courier
Restaurant Warehouse
Data sourced from the agency's DesignRush profile
QOLOS Reviews & Testimonials
Amanda Viviano
Vice President at Bartz Viviano
5.0★
WooCommerce Review from Amanda Viviano
We hired Qolos to build our local florist shop's website on WordPress and WooCommerce, and we couldn't be happier with the results. From the start, they took the time to understand our business and created a site that's not only beautiful but easy for our customers to browse and shop.
The WooCommerce setup was seamless, our online ordering works exactly the way we needed it to. But what really sets Qolos apart is their ongoing monthly maintenance. We never have to worry about updates, security, or technical issues because they stay on top of everything. Any time we've had a question or a small change request, they've been responsive and professional.
As a small local business, it means a lot to work with a team that genuinely cares about keeping our site running smoothly. Qolos has been a true partner, not just a vendor. Highly recommend them to any local business looking for reliable web design and maintenance!
Sanjay Singh
Manager at JCB India Ltd.
5.0★
Web Development Review from Sanjay Singh
I kept getting negative reviews about my app for technical glitches, heating issues, functionality, loading time, crashing, and more bugs. So, I reached out to QOLOS after going through 2-3 renowned review platforms. I explained my app issue to the team, and they did tremendous work with their mobile testing solutions. Also, I wanted to build a website for my app. They created a feature-rich and seamless website.
Sarah Nesheim
Co-Founder at Crafted
5.0★
Shopify Review from Sarah Nesheim
Working with QOLOS was the best decision I have made in regards to scaling my business. They are professional, so creative, they communicate every step of the way and their pricing is fair for the highest quality work. The designer of our logo and website did it well and I am so impressed and proud of the final product! the designer listened and knew exactly what I wanted which made the process so simple. Seriously could not recommend QOLOS more!
Reviews verified by DesignRush and sourced from the agency's profile
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Softeq is a versatile technology and Greentech company offering a wide range of services, including embedded system development, machine learning, digital transformation, hardware design, UX/UI design, and more...
Top Services:
Mobile App Development
Software Development
Software Testing
Blockchain
Wearables
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Location
Houston, Texas
Number of Employees
250 - 499
Average Hourly Rate
$80/hr
Minimal Budget
$50,000 & Up
Portfolios Count
8 Projects Listed
Softeq Services
Mobile App Development
Software Development
Software Testing
Blockchain
Wearables
UI/UX Design
Cybersecurity
AI Development
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Lenovo
Epson
Microsoft
WTA
NVIDIA
Verizon
G.J.Gardner
Walt Disney Parks and Resorts
Happiest Baby
Data sourced from the agency's DesignRush profile
Softeq Reviews & Testimonials
Quan Gan
Owner at Gantom Lighting & Controls
5.0★
Software Development Review from Quan Gan
We collaborated with Softeq to develop an infrared emitting platform. Softeq provided software development and support services, streamlining our project. While our hardware technology was excellent, Softeq elevated our company's products with superb software development and implementation solutions. Working with Softeq was highly beneficial for us, as the agency managed our projects more efficiently due to exceptional project management and organized workflows.
Jeff Johnston
Founder and Chief Executive Officer at A-List Enterprises
5.0★
Mobile App Development Review from Jeff Johnston
We hired Softeq for mobile app development services. Softeq developed a functional and user-friendly app, efficiently integrating productivity features like calendar, contacts, and task management. The agency organized regular meetings with our product management department, communicated effectively, and promptly resolved issues. Softeq's team worked diligently and provided valuable insights. We were satisfied with Softeq's services.
Trent Gardner
Information Technology (IT) Manager at G.J. Gardner Homes
5.0★
Software Development Review from Trent Gardner
We worked with Softeq for software redevelopment services to improve our company's proprietary software. Softeq updated the business platform, streamlining operations and enhancing the platform's user UI and functionality. This improvement aided our sales, job estimating, purchase orders, and administration efforts. Softeq's team was professional, attentive, and prompt in implementing feedback. The agency delivered high-quality work, impressing our company's internal stakeholders.
Reviews verified by DesignRush and sourced from the agency's profile
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We integrate, innovate, and elevate enterprise systems.
Intellectsoft builds custom software, AI solutions, and dedicated engineering teams for enterprises and fast-growing businesses across the US and UK...
Top Services:
Software Development
Mobile App Development
Wearables
Software Testing
Blockchain
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Location
New York City, New York
Number of Employees
100 - 249
Average Hourly Rate
$80/hr
Minimal Budget
$50,000 & Up
Portfolios Count
12 Projects Listed
Intellectsoft Services
Software Development
Mobile App Development
Wearables
Software Testing
Blockchain
AI Development
UI/UX Design
Big Data Analytics
IT Services
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Harley-Davidson
the London Stock Exchange
Ernst & Young
Qualcomm
Bombardier
Data sourced from the agency's DesignRush profile
Intellectsoft Reviews & Testimonials
Harshal Chhajed
Undisclosed at Undisclosed
4.5★
Software Development Review from Harshal Chhajed
They have highly skilled support staff for faster resolution which leads to customer satisfaction. Also, it has many features including IoT and blockchain apart from regular software development. If there are any changes in the scope of the project at a later stage, it can prove quite costly and also difficult to accommodate last-minute client-side scripting changes. They are versatile, cost-effective, and offer quick customer support. They offer a very customized software development tool where business needs can be addressed. It is very cost-optimized and hence can help generate good returns for business investment.
Vitaly Dyachenko
CEO and Founder at UppLabs LLC
5.0★
Software Development Review from Vitaly Dyachenko
Intellectsoft provided a great partnership by delivering quality services and working fast. They helped us to accomplish all the clients' projects on time. The team communicated transparently and showed [] great dedication. They were an ideal partner! (Verified via email)
Reviews verified by DesignRush and sourced from the agency's profile
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Zoho consulting, development and integration services for operationally complex organizations.
CodeStringers helps growth-stage and small-to-mid-market companies implement, integrate, and operate Zoho-centered digital enablement solutions by combining senior executive consulting, cost-effective delivery teams, and custom software capabilities when needed...
Top Services:
Software Development
AI Development
Web Development
CRM Consulting
ERP Consulting
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Location
Santa Cruz, California
Number of Employees
50 - 99
Average Hourly Rate
$55/hr
Minimal Budget
$50,000 & Up
CodeStringers Services
Software Development
AI Development
Web Development
CRM Consulting
ERP Consulting
Managed Services
Mobile App Development
Software Testing
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Tübr Storage
Addiction Rep
True Pet Kitchens
MasterControl
Tonal
MindTRAK Golf
Mido Play
Inboard Technology
SiteOne Services
KnowledgeDesk
Data sourced from the agency's DesignRush profile
CodeStringers Reviews & Testimonials
Lori Feld Oakley
Executive VP at MasterControl
5.0★
Software Development Review from Lori Feld Oakley
Our Services organization is scaling quickly and we urgently needed a custom software application to automate our workflows, without breaking our annual budget. CodeStringers was the perfect fit, supporting us from ideation through go-live and everything in between. They innovated, hit their deadlines and released an amazingly high quality application that decreases our internal costs and improves our reputation with our customers. It would not have happened without CodeStringers.
Christian Schraga
CEO at Tabula Learning
4.8★
Enterprise Review from Christian Schraga
CodeStringers is the perfect outsourcer to call If you have a solid software business idea but don’t know exactly how to bring it to life. They have both a top-notch development team as well as an executive staff with expertise in marketing, finance, and general business acumen. So they can not only build a product for you but they can make sure that the product you want to build is likely to succeed in the marketplace.
Reviews verified by DesignRush and sourced from the agency's profile
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Innolab AI builds revenue engines, not just software. Jane creates pipeline. Luna closes it.
Innolab AI builds AI systems that sell for you.
Jane replaces SDR teams with automated, hyper-personalized outbound.
Luna calls and books meetings 24/7 with human-like conversations.
We help B2B leaders generate pipeline, cut admin time, and scale revenue without chaos...
Top Services:
AI Development
Mobile App Development
Web Development
Software Testing
Blockchain
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Location
Columbus, Ohio
Number of Employees
50 - 99
Average Hourly Rate
$59/hr
Minimal Budget
$50,000 & Up
Portfolios Count
2 Projects Listed
Innolab Services
AI Development
Mobile App Development
Web Development
Software Testing
Blockchain
Staff Augmentation
UI/UX Design
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Flonest
Dollar Shave Club
Buddy Lee Jump ropes
Data sourced from the agency's DesignRush profile
Innolab Reviews & Testimonials
Buddy Lee
CEO at Buddy Lee Jump Ropes
5.0★
B2C Apps Review from Buddy Lee
Innolab delivered exactly what we needed a high quality, AI powered jump training app with realtime feedback and sleek design.
The team was professional, collaborative, and hit every milestone on time. Highly recommend them for any innovative app development.
Reviews verified by DesignRush and sourced from the agency's profile
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At LKICORP®, we provide expert engineering services to clients across a range of industries. Our team of skilled engineers has experience in mechanical, electrical, and environmental engineering, among others. We work closely with our clients to understand their unique needs and develop customized solutions...
Top Services:
Mobile App Development
Software Testing
VR/AR
Blockchain
Software Development
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Location
Pittsburgh, Pennsylvania
Number of Employees
1000 & Up
Average Hourly Rate
$300/hr
Minimal Budget
$50,000 & Up
LKICORP Services
Mobile App Development
Software Testing
VR/AR
Blockchain
Software Development
AI Development
Wearables
Product Design
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
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
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Apadmi designs, develops and optimises mobile apps for leading brands. We unlock new value through strategy, platforms, middleware and systems integrations that transform the way they work...
Top Services:
Mobile App Development
UI/UX Design
Web Development
Software Testing
Blockchain
Show more
Location
Manchester, United Kingdom
Number of Employees
250 - 499
Average Hourly Rate
$200/hr
Minimal Budget
$50,000 & Up
Apadmi Services
Mobile App Development
UI/UX Design
Web Development
Software Testing
Blockchain
Software Development
CRM Consulting
Managed Services
IT Services
DevOps Consulting
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Co-op
Domino's Pizza UK and Ireland
The Guardian
United Utilities
HSS
NHS
SailGP
Argos
Charles Stanley
BBC
Data sourced from the agency's DesignRush profile
Apadmi Reviews & Testimonials
Thomas Booth
Review from Google
2.0★
Thomas Booth's Review Sourced from Google
I recently had an experience back in 2022 with Apadmi that I feel compelled to share and have debated whether i should post this. As a professional eagerly looking forward to an interview with Apadmi, I was unfortunately met with a series of disappointments.
Firstly, the structured process I was initially promised for the interview was not adhered to. This lack of organisation not only threw me off but also made it challenging to present myself effectively and forced to do a presentation in less than 24 hours notice.
More concerning, however, was my interaction with the Managing Director, not sure if he is still there. I found his demeanour not just unprofessional but outright rude. This was disheartening, especially coming from a leadership figure in a reputable company. I've actually never been so humiliated in the professional environment.
It's important for companies to remember that interviews are a two-way process. They are not just about evaluating candidates, but also about demonstrating the company's values and culture. Unfortunately, my experience with Apadmi fell short of the professional standards one would expect, however i would say Marcus, one of the board members was a delight in my first stage.
I hope my feedback is taken constructively, as it is intended to highlight areas where there is significant room for improvement in how Apadmi manages its recruitment process and senior staff interactions.
Steve Jackson
Review from Google
5.0★
Steve Jackson's Review Sourced from Google
Fantastic team, you can rely on them always.. Robert a partner of Apadami is an exceptional individual who supported me with my project in a professional manner. With his excellent peoples skills he will look after you. The person you can rely on anything and keep you assured. Will always go back to Apadami.
Manoj Ranaweera
Review from Google
5.0★
Manoj Ranaweera's Review Sourced from Google
Apadmi's ability to spin out technology as separate companies is remarkable. A strong supporter of Manchester tech ecosystem, they became unbeatable in mobile category during the first three years of northern tech awards before it adopted a new structure and ownership. Another remarkable achievement is that the four founders have remained together during all these years. I wish them all the best.
Reviews verified by DesignRush and sourced from the agency's profile
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IT teams and business leaders are often at odds. This is in large part because technologists focus on technology rather than the underlying business issue. This company was founded to bridge that gap and to allow business owners the ability to fully leverage their tech stack. We offer near shore resources...
Top Services:
Managed Services
IT Services
DevOps Consulting
Staff Augmentation
AI Development
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Location
Bellingham, Washington
Number of Employees
100 - 249
Average Hourly Rate
$80/hr
Minimal Budget
$50,000 & Up
KIS Solutions Services
Managed Services
IT Services
DevOps Consulting
Staff Augmentation
AI Development
Software Development
Software Testing
CRM Consulting
Big Data Analytics
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
AI enablement and custom AI development company helping enterprises and mid-market leaders adopt, scale, and succeed with AI - faster, safer, and smarter. We simplify the complexity of enterprise AI by guiding organizations from strategy to deployment, combining consulting, custom development, and proven AI...
Top Services:
Product Design
UI/UX Design
AI Development
IoT
Software Development
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Location
Zagreb, Croatia
Number of Employees
50 - 99
Average Hourly Rate
$100/hr
Minimal Budget
$50,000 & Up
Margins Services
Product Design
UI/UX Design
AI Development
IoT
Software Development
Software Testing
Mobile App Development
Design Services
DevOps Consulting
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
John Hopkins University
Mars
Croatian Medical Chamber
Data sourced from the agency's DesignRush profile
Margins Reviews & Testimonials
Marko Bajlo
Review from Google
5.0★
Marko Bajlo's Review Sourced from Google
I’ve got a chance to cooperate with agency, very professional and problem solving oriented team!
Reviews verified by DesignRush and sourced from the agency's profile
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Frequently Asked Questions About Software Testing Companies
What services do software testing firms provide?
Software testing companies provide different testing services to identify errors, security risks, performance issues, and how the software behaves in real-life situations and across devices. As part of their software testing service, they also check if each feature works as expected, fix bugs, make improvements, and make sure new software development updates don’t break existing functions, so the software quality remains stable.
Hourly rates for QA testing range from $25 to $200+. The final cost is determined based on the size of the software or application, its complexity, required testing type, tech stack (custom-built and older legacy systems cost more), and niche.
The rate will also depend on the seniority of the software tester. Across the United States, junior quality assurance (QA) tester may charge $70 to $110 per hour, while the rate for a senior QA mentor and automation engineer can range from $130 to $200 per hour.
Special software testing services such as QA audit goes from $5,000 to $25,000.
How can businesses know what type of software testing do they need?
Businesses can determine what type of testing solutions they need based on the potential impact of failures and the likelihood of defects. Namely, if they encounter:
Core functionality issues: Use functional testing to verify features work as expected
Unstable code or new features: Use unit testing for individual components and integration testing for modules working together
Poor system stability after updates: Seek regression testing to make sure new changes didn't break existing features
Performance and load issues: Use performance and load testing to evaluate speed and scalability
Security issues: Security and penetration testing are commonly used across apps handling sensitive user data
Hard-to-navigate user experience (UX): Pursue usability testing to determine how intuitive the application is for end users
Low compatibility across devices: Compatibility testing can evaluate how good the app works on different browsers, devices, and OS versions
There is also the option to choose between manual and automated testing.
Is automated testing more expensive than manual testing?
As an investment, automated testing is pricier than manual testing but offers a lower cost-per-test over time as it can run the same scripts repeatedly, without human intervention. Conversely, manual testing entails lower upfront fee, but its cost grows linearly as the project grows, as every test cycle requires paid hours from QA testers.
So, for short-term projects or ones with shifting requirements, manual testing is considered a more economical option, whereas for maintenance and regression cycles, automated testing grants better return on investment.
The main distinction between these methodologies is that manual testing relies on human observation and interaction to identify defects, whereas automated testing uses software scripts to compare outcomes against predicted results.
Manual testing is best suited for exploratory testing, usability assessments, ad-hoc bug hunting, and minor hotfix verifications where script development would be inefficient. Automated testing, on the other hand, is primarily used for regression testing to make sure the new code does not break existing features.
How do businesses measure the effectiveness of software testing?
The effectiveness of the software testing is measured via:
Code coverage: The percentage of the code that has been tested
Defect density: The number of defects found per unit of code
Test case effectiveness: The percentage of test cases that identify defects; helps prune redundant and ineffective tests
Time to detect and fix defects: The time it takes to identify and fix software defects and software bugs
Defect leakage: The number of bugs that "escaped" to production versus those caught during the testing phase
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