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.

Sketch Development Services
VerifiedVerified by the DesignRush team for authenticity and credibility.Build it. Run it. Own it.
We embed development teams to build the right AI-enabled custom software, and equip your team to run it...
Top Services:
- Software Development
- Cloud Consulting
- UI/UX Design
- eCommerce Development
- DevOps Consulting
- Show more
- Location
- St. Louis, Missouri
- Number of Employees
- Under 49
- Minimal Budget
- $50,000 & Up
- Portfolios Count
- 8 Projects Listed
Data sourced from the agency's DesignRush profile, its website, and other relevant accountsSketch Development Services Services
Data sourced from the agency's DesignRush profileU.S. Bank Centene Corporation Maritz Change Healthcare Stifel Reinsurance Group of America (RGA) bioMerieux CareSource CENTEGIX Purina
Sketch Development Services Reviews & Testimonials
Monica's Review Sourced from Google
Amazing and talented people. I’ve worked for both client and agency side and can can say their partnership is amazing. They truly care about ongoing operations and not just ending it at a project level. Highly recommend! Message me if you want specifics.
John Andesilich's Review Sourced from Google
I own a marketing firm in Troy MO and I recently met with Calvin at Sketch Development Services to discuss a software development project I have been thinking about pursuing. He was very nice, easy to speak to and even though his field is a bit out of my knowledge base, he was able to explain things in a way that made perfect sense. I look forward to working with him and his team in the future and recommend anyone looking for a software or app development company to give them a try.
Reviews verified by DesignRush and sourced from the agency's profile View All ReviewsMore 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...
Top Services:
- Software Development
- AI Development
- Big Data Analytics
- Mobile App Development
- UI/UX Design
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- Location
- San Francisco, California
- Number of Employees
- 100 - 249
- Average Hourly Rate
- $55/hr
- Minimal Budget
- $50,000 & Up
- Portfolios Count
- 11 Projects Listed
Data sourced from the agency's DesignRush profile, its website, and other relevant accountsBlue Trail Software Services
Data sourced from the agency's DesignRush profileSamsung Cartier Axeptio AxisCare Compredict Odia Precision Bearing AI Collaborative Classroom Certain
Top Healthcare Product, Technology, & Venture Design Firm
Sidebench is the top healthcare technology design and software engineering firm in the US. We combine strategy, design, technical architecture at every point of our process. We are known for delivering extraordinary business results...
Top Services:
- Mobile App Development
- Software Development
- AI Development
- Wearables
- UI/UX Design
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- Location
- Los Angeles, California
- Number of Employees
- Under 49
- Minimal Budget
- $50,000 & Up
- Portfolios Count
- 11 Projects Listed
Data sourced from the agency's DesignRush profile, its website, and other relevant accountsSidebench Services
Data sourced from the agency's DesignRush profileAmerican Heart Association Children's Hospital Los Angeles (CHLA) Hoag Hospital Cortica A16Z (Andreessen Horowitz) Lightspeed Venture Partners Microsoft Rud Bull HP Sony
Sidebench Reviews & Testimonials

Translation Services Review from Abhit
They provide consulting services for a healthcare service provider. Sidebench contributed their expertise to a comprehensive mobile application to make sure it would pass Apple Store requirements. Thanks to Sidebench`s input, the application launched on the Apple Store after the first submission. Sidebench`s response times were quick, and they were willing to accommodate a unique working arrangement. The relationship that we had was probably unique; most companies would push to do the development themselves. We only needed Sidebench`s know-how, and they were willing to accommodate us.
Reviews verified by DesignRush and sourced from the agency's profile View All ReviewsA lifelong partner to solve any tech challenge together
Hi there! We were expecting you!We are a nearshore software services and consulting company that partners with forward-thinking companies to achieve their business goals and accelerate growth in the digital age.We are seen as a lifelong partner for tackling any tech challenge...
Top Services:
- Software Development
- Mobile App Development
- IT Services
- UI/UX Design
- Web Development
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- Location
- Montevideo, Uruguay
- Number of Employees
- 100 - 249
- Average Hourly Rate
- $70/hr
- Minimal Budget
- $50,000 & Up
- Portfolios Count
- 1 Project Listed
Data sourced from the agency's DesignRush profile, its website, and other relevant accountsSwitch Software Solutions Services
Data sourced from the agency's DesignRush profilePenske Logistics Santander Consumer Zenus Bank Verifone BBVA Bank Axletree Oddissey BCIE Sodexo Allied World
Switch Software Solutions Reviews & Testimonials
Hernán Garro's Review Sourced from Google
Excellent working place. People is the most valuable characteristic. Interest in continuous improvement is not less remarkable. It is a comfortable place to work with plenty of amenities.
Andres Sierra's Review Sourced from Google
Test your software before taking it to production, do it with what you are developing or with what you are buying.
Reviews verified by DesignRush and sourced from the agency's profile View All ReviewsSupercharge - Innovating Digital Product Development
At Supercharge, we partner with our clients to turn disruption into opportunity by creating transformative digital solutions. With over 200 digital experts across New York, London, Amsterdam, Helsinki, Vienna, and Budapest, we develop digital strategies, design delightful interfaces, and build robust software...
Top Services:
- Software Development
- AI Development
- Digital Services
- Product Design
- Mobile App Development
- Show more
- Location
- London, United Kingdom
- Number of Employees
- 100 - 249
- Minimal Budget
- $50,000 & Up
- Portfolios Count
- 6 Projects Listed
Data sourced from the agency's DesignRush profile, its website, and other relevant accountsSupercharge Services
Data sourced from the agency's DesignRush profileBritned Eleclink gateretail OTP Bank Kodak Alaris Deutsche Telekom Vodafone Santander VYRD Cambridge Mobile Telematics
Mobile App Devs Who Understand Business, Not Just Code
Touchlane is a European mobile development studio that truly gets startups and SMBs. With 10+ years on the market, we turn ideas in fintech, health & fitness, and entertainment mobile development into secure, high-performing apps users love...
Top Services:
- Mobile App Development
- Software Development
- Staff Augmentation
- Cybersecurity
- IT Services
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- Location
- Tallinn, Estonia
- Number of Employees
- Under 49
- Average Hourly Rate
- $50/hr
- Minimal Budget
- $50,000 & Up
- Portfolios Count
- 5 Projects Listed
Data sourced from the agency's DesignRush profile, its website, and other relevant accountsTouchlane Services
Data sourced from the agency's DesignRush profileColorTherapy Citrus AI Shape Promo App Vicinity Musicfeed Gaimin Netapix SmartVolt Elo Health
Modotech's ISi Helps Small & Mid-Tier P&C Carriers and MGAs Scale, Succeed & Sustain
ISi PAS is built and serviced by insurance professionals for insurance professionals...
Top Services:
- UI/UX Design
- IoT
- AI Development
- Software Testing
- Mobile App Development
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- Location
- Media, Pennsylvania
- Number of Employees
- 50 - 99
- Minimal Budget
- $50,000 & Up
Data sourced from the agency's DesignRush profile, its website, and other relevant accountsModotech Services
Data sourced from the agency's DesignRush profileSnap Insurance Service Cornerstone Operations Group ARI
Enabling companies to adapt and scale AI.
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
- Show more
- Location
- Zagreb, Croatia
- Number of Employees
- 50 - 99
- Average Hourly Rate
- $100/hr
- Minimal Budget
- $50,000 & Up
Data sourced from the agency's DesignRush profile, its website, and other relevant accountsMargins Services
Data sourced from the agency's DesignRush profileJohn Hopkins University Mars Croatian Medical Chamber
Margins Reviews & Testimonials
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 View All Reviews
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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.Â
Core services include:Â
- Functional testing Â
- Performance testing Â
- Security testing Â
- Usability testing Â
- Regression testing Â
- Automation testing Â
- Accessibility testing  Â
- Mobile app testing Â
- API testing Â
- Compatibility testing across devices/browsers Â
- Compliance testing Â
- Testing with artificial intelligence (AI) tools
- QA auditÂ
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. Â
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. Â
Special software testing services such as QA audit goes from $5,000 to $25,000.Â
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:Â Â
- Core functionality issues: Use functional testing to verify features work as expectedÂ
- Unstable code or new features: Use unit testing for individual components and integration testing for modules working togetherÂ
- Poor system stability after updates: Seek regression testing to make sure new changes didn't break existing featuresÂ
- Performance and load issues: Use performance and load testing to evaluate speed and scalabilityÂ
- Security issues: Security and penetration testing are commonly used across apps handling sensitive user dataÂ
- Hard-to-navigate user experience (UX): Pursue usability testing to determine how intuitive the application is for end usersÂ
- Low compatibility across devices: Compatibility testing can evaluate how good the app works on different browsers, devices, and OS versionsÂ
There is also the option to choose between manual and automated testing. Â
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. Â
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.Â
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. Â
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.Â
How do businesses measure the effectiveness of software testing?
The effectiveness of the software testing is measured via:Â
- Code coverage: The percentage of the code that has been testedÂ
- Defect density: The number of defects found per unit of codeÂ
- Test case effectiveness: The percentage of test cases that identify defects; helps prune redundant and ineffective testsÂ
- Time to detect and fix defects: The time it takes to identify and fix software defects and software bugsÂ
- Defect leakage: The number of bugs that "escaped" to production versus those caught during the testing phase Â






