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
4 Companies-Rankings updated: September 04, 2026
Every agency on DesignRush has been evaluated for its expertise and client feedback to empower informed choices. Some listings include paid partnerships.
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 View All Reviews
Smartym Pro is a full-cycle development company specialized in mobile application and enterprise web development. Company has strong development culture and focuses on innovative solutions, using cutting edge technologies and frameworks. Smartym Pro is located in Eastern Europe and consists primarily of...
Top Services:
Software Development
Mobile App Development
Staff Augmentation
Blockchain
IT Services
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Location
Warsaw, Poland
Number of Employees
50 - 99
Average Hourly Rate
$45/hr
Minimal Budget
$50,000 & Up
Portfolios Count
9 Projects Listed
Smartym Pro Services
Software Development
Mobile App Development
Staff Augmentation
Blockchain
IT Services
Web Development
Software Testing
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Coach-Apps
Heineken
Automagic
Pepsico
Sony (retailers)
Data sourced from the agency's DesignRush profile
Smartym Pro Reviews & Testimonials
Shaun Bennie Director at in5pire
5.0★
Software Development Review from Shaun Bennie
Co-funding’s collaboration with Smartym Pro began from discovery stage and design services for our online investor automation platform. In these initial stages Smartym demonstrated great skill and aptitude which convinced us to appoint them for the full MVP development part of the project. Smartym Pro’s team offered their vision to improve the quality of the delivered product. They met all deadlines and were keen to give great advice. It was a pleasure to work with Smartym Pro’s team.
Aleksander Stepanowicz CFO, co-founder at D-Factor Sp. z o.o.
4.8★
Outsourcing Review from Aleksander Stepanowicz
The Smartym Pro’s team has solid experience in development of web/mobile apps, blockchain platforms and smart contracts. We collaborate with Smartym Pro since June 2018 on 4 projects and are satisfied so far. The team is aware of cutting edge trends in emerging technologies and demonstrate willingness to contribute to the projects in an informal and creative way. And what is very important for us they tend to meet deadlines.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Innovative software solutions to your organisations most challenging problems.
Microknot is a software development agency based in Sydney. We provide innovative software solutions to your organization's most challenging problems...
Top Services:
Software Development
Mobile App Development
Software Testing
IT Services
AI Development
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Location
Bella Vista, Australia
Number of Employees
Under 49
Average Hourly Rate
$500/hr
Minimal Budget
$50,000 & Up
Portfolios Count
5 Projects Listed
Microknot Services
Software Development
Mobile App Development
Software Testing
IT Services
AI Development
Wearables
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
Anglicare
Site360
Lonza Group AG
Probate
TaxToday
Data sourced from the agency's DesignRush profile
Microknot Reviews & Testimonials
Aravind Nambiar Review from Google
5.0★
Aravind Nambiar's Review Sourced from Google
Worked with Microknot over a period of 4 months to build a financial simulation & visualization of supply chain activities. Microknot architect and engineers provided the framework, design & setup on Azure and the development activities. It was a great experience working with them!
Kel A Review from Google
5.0★
Kel A's Review Sourced from Google
The EDI system that Microknot created was a little slow to start up due to the complexity of our system. But it's now reached a point where it's saving me time with our orders. The team were prompt in responding to emails & were a pleasure to work with.
Dave Philips Review from Google
5.0★
Dave Philips's Review Sourced from Google
We have enjoyed working with Jag, Shaun, and several of Microknot's developers over the past 18 months. The Microknot team has allowed us to accelerate the time to market for our platform, translating to money in the bank and added scale to our internal development team without the risks, time delays, and costs associated with hiring new staff.Microknot's professionalism in managing our project has also lifted the game for our internal team. Not only have they delivered a great product outcome, but we've also learned a lot about different technologies and effective s/ware PM methodology in the process.The Microknot team have been responsive, easy to work with, delivered every sprint on time, and significantly contributed to guiding our application in the right direction.I can't thank the team at Microknot enough for their contribution to Biode, and I would not hesitate to recommend them to any business looking for a trusted development partner.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
Rebbix proves that results-oriented outsourcing without bullshit and sugar coating is possible.We provide highly effective engineering teams as a service. Since 2012, weve been helping online marketplaces scale to different markets, transform from classifieds to transactional, launch, pivot, and find...
Top Services:
Software Development
Mobile App Development
Staff Augmentation
UI/UX Design
IoT
Show more
Location
Lviv, Ukraine
Number of Employees
50 - 99
Average Hourly Rate
$65/hr
Minimal Budget
$50,000 & Up
Portfolios Count
4 Projects Listed
Rebbix Services
Software Development
Mobile App Development
Staff Augmentation
UI/UX Design
IoT
Software Testing
DevOps Consulting
AI Development
Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
OLX Group
Fixly
Day.io
Dreamlines
modnaKasta
Belvilla
Mozilla
MDC IndĂşstria de Containers InteligĂŞntes
Investing
Data sourced from the agency's DesignRush profile
Rebbix Reviews & Testimonials
Ivan Yarych Review from Google
5.0★
Ivan Yarych's Review Sourced from Google
A very comfortable company to work for - thanks to the people who work here and the well-thought-out workspace.
Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
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
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
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