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.
Organic rankings are determined by five factors: top services, reviews, portfolio, awards/press, and team expertise. Sponsored listings pay for a placement that appears above organic positions. Sponsorship does not affect star ratings or review content - read more on our methodology page.

LeanCode
VerifiedVerified by the DesignRush team for authenticity and credibility.Top Flutter Development Company for Enterprises and Scale-Ups
LeanCode is a full-cycle software development company designated as an official Flutter consultant by Google. With a team of 80+ tech experts, we build software solutions that drive change and help enterprises scale...
Top Services:
- Mobile App Development
- Software Development
- Software Testing
- Staff Augmentation
- Show more
- Location
- Warsaw, Poland
- Number of Employees
- 50 - 99
- Average Hourly Rate
- $99/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 19 Projects Listed
Data sourced from the agency's DesignRush profile, its website, and other relevant accountsLeanCode Services
Data sourced from the agency's DesignRush profileCredit Agricole Bank Polska Virgin Money E. Wedel Maspex Sonova Millennium Bank Welliba Tide Shell Prospector
LeanCode Reviews & Testimonials
Matej Rešetár's Review Sourced from Google
Not only do they make great apps, but they also have the best coffee in the area. For that reason, I recommend coming to a meeting in person 😉
Igor Pielas's Review Sourced from Google
Working with a team is a combination of professionalism with high energy and a proactive approach to software development challenges. I definitely recommend it and will be happy to answer questions based on our project - the Activy application for B2B and Polish cities.
Reviews verified by DesignRush and sourced from the agency's profile View All ReviewsBluePixel is an award-winning UX/UI and software development international company. We combine a human-centered approach with the latest tech stack to create world-class software...
Top Services:
- UI/UX Design
- Software Development
- CRO
- Web Development
- Mobile App Development
- Show more
- Location
- Mexico City, Mexico
- Number of Employees
- 50 - 99
- Average Hourly Rate
- $50/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 103 Projects Listed
Your business faces unique challenges. Let's work together to create a custom mobile app or web solution to meet those challenges head-on...
Top Services:
- Mobile App Development
- Software Development
- Staff Augmentation
- IoT
- AI Development
- Show more
- Location
- Nashua, New Hampshire
- Number of Employees
- 250 - 499
- Average Hourly Rate
- $35/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 8 Projects Listed
Kernelics is a boutique web and mobile software development firmfor startups and tech companies...
Top Services:
- Mobile App Development
- Staff Augmentation
- Product Design
- Software Development
- eCommerce Development
- Show more
- Location
- London, United Kingdom
- Number of Employees
- 50 - 99
- Average Hourly Rate
- $40/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 18 Projects Listed
CitrusDev is a team of experts with a general focus on the Internet of Things (IoT) project development. Our team's key points of interest are Smart Home, Smart City, Smart Farm, Automotive, Healthcare, and Indoor navigation domains. We cover the Hi-tech, Retail, Fintech, and Education industries as well...
Top Services:
- IoT
- Web Development
- Mobile App Development
- Wearables
- WordPress Website Design
- Show more
- Location
- Kyiv, Ukraine
- Number of Employees
- Under 49
- Average Hourly Rate
- $35/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 7 Projects Listed
Coderus is a leading software and app development company based in the UK, and we provide services to start-ups, medium businesses, and large blue-chip enterprises globally...
Top Services:
- Mobile App Development
- IoT
- Software Development
- Software Testing
- Design Services
- Show more
- Location
- Martlesham, United Kingdom
- Number of Employees
- Under 49
- Average Hourly Rate
- $99/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 5 Projects Listed
Rolique is a comprehensive software development firm, distinguished by an extensive portfolio encompassing more than 110 triumphant endeavors across the domains of healthcare, fintech, and industrial technology sectors...
Top Services:
- Web Development
- UI/UX Design
- Mobile App Development
- AI Development
- Software Development
- Show more
- Location
- Lviv, Ukraine
- Number of Employees
- 50 - 99
- Average Hourly Rate
- $65/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 9 Projects Listed
Empowering companies with skilled engineering talent so they can execute their digital transformation and product development strategies affordably and seamlessly...
Top Services:
- Mobile App Development
- Software Development
- Staff Augmentation
- DevOps Consulting
- IT Services
- Show more
- Location
- London, United Kingdom
- Number of Employees
- 50 - 99
- Average Hourly Rate
- $25/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 1 Project Listed
Algosoup is a London-based software development company that provides AI-native, forward-deployed engineering services by embedding software engineers into client teams. It supports startups, scaleups, enterprises, and agencies with rapid MVP development, product engineering, AI integration, legacy...
Top Services:
- AI Development
- Software Development
- Mobile App Development
- Software Testing
- eCommerce Development
- Show more
- Location
- London, United Kingdom
- Number of Employees
- Under 49
- Average Hourly Rate
- $300/hr
- Minimal Budget
- $25,000 - $50,000
At Colchuck Consulting, our mission is to drive growth and innovation through tailored technology solutions. Founded by industry experts, our agency offers a unique blend of skills and knowledge, providing a boutique experience with cutting-edge technology and strategic support to maximize your ideas and...
Top Services:
- Software Development
- Mobile App Development
- Cloud Consulting
- Web Development
- UI/UX Design
- Show more
- Location
- Burien, Washington
- Number of Employees
- Under 49
- Average Hourly Rate
- $150/hr
- Minimal Budget
- $25,000 - $50,000
- Portfolios Count
- 3 Projects Listed
Software Testing Specializations
Services Related to Software Testing
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Why companies trust DesignRush
Every agency is independently vetted before it can be listed or ranked
Some agencies pay for sponsored placement, clearly labeled and held to the same vetting standards.
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.
Core services include:
- Functional testing
- Performance testing
- Security testing
- Usability testing
- Regression testing
- Automation testing
- Accessibility testing
- Mobile app testing
- API testing
- Compatibility testing across devices/browsers
- Compliance testing
- Testing with artificial intelligence (AI) tools
- QA audit
How much do software testing services cost?
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







