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

6 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.

Other × $10,000 - $25,000 ×
  • Technology Connects

    Bellosoft is a global software development agency helping businesses scale through custom solutions in web, mobile, AI, and cloud technologies. With a focus on innovation, agility, and measurable results, we partner with startups and enterprises in the US, UK, and Europe to deliver reliable products and...

    Top Services:

    • Software Development
    • UI/UX Design
    • Web Development
    • Mobile App Development
    • eCommerce Development
    • Show more
    Location
    Watford, United Kingdom
    Number of Employees
    Under 49
    Average Hourly Rate
    $65/hr
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    16 Projects Listed

    Bellosoft Limited Services

    • Software Development
    • UI/UX Design
    • Web Development
    • Mobile App Development
    • eCommerce Development
    • AI Development
    • Software Testing
    • Web Design
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Modern Tribe
    • Greyhound Racing Ireland
    • Unrvld
    • Levo
    • Moran's Catering
    • Novo Digital
    • Sentel
    • Mortgage Propeller
    • Etain
    • FBA
    Data sourced from the agency's DesignRush profile
  • Your Automation And AI Adoption Partner

    Most businesses know something is slow or broken. They don't know exactly what to fix, or where AI actually fits. We start there: map your processes, find the highest-ROI automations, then build, run, and help your team adopt them as your ongoing AI automation partner. Certified n8n Expert Partner, Clutch...

    Top Services:

    • AI Development
    • Mobile App Development
    • Software Development
    • CRM Consulting
    • IT Services
    • Show more
    Location
    Tuckahoe, New York
    Number of Employees
    Under 49
    Average Hourly Rate
    $80/hr
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    3 Projects Listed

    2V Automation Services

    • AI Development
    • Mobile App Development
    • Software Development
    • CRM Consulting
    • IT Services
    • Cloud Consulting
    • Web Development
    • Software Testing
    • UI/UX Design
    • Business Consulting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Georgia University
    • AI Design
    • Signature Champion Rings
    • Fit For Golf
    • Fireplan
    • Zippo Aps
    • Shila.so
    • Contrail Financial
    • Bright Defense
    • Select Surplus
    Data sourced from the agency's DesignRush profile
  • Best Custom App & AI Development Agency in UK

    At Evangelist Apps, we go beyond app development, offering IT consultancy and comprehensive digital solutions that are customized to your business goals. Our goal is to deliver effective, customized strategies that fuel growth and align with industry standards...

    Top Services:

    • Mobile App Development
    • UI/UX Design
    • IT Services
    • Staff Augmentation
    • DevOps Consulting
    • Show more
    Location
    Fleet, United Kingdom
    Number of Employees
    50 - 99
    Average Hourly Rate
    $49/hr
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    4 Projects Listed

    Evangelist Apps Services

    • Mobile App Development
    • UI/UX Design
    • IT Services
    • Staff Augmentation
    • DevOps Consulting
    • Graphic Design
    • AI Development
    • VR/AR
    • Software Development
    • Software Testing
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • Union Bank of Switzerland
    • British Airways
    • Hastens Ltd.
    • BBC
    • British Gas
    Data sourced from the agency's DesignRush profile

    Evangelist Apps Reviews & Testimonials

    • Khushboo Gangarde
      Khushboo Gangarde Review from Google
      5.0

      Khushboo Gangarde's Review Sourced from Google

      I’m currently working with Evangelist App, and it’s been an amazing experience so far. The environment here is super supportive and creative — I’ve learned so much in a short time. Every day brings a new challenge, and I can genuinely see myself growing, both professionally and personally. The team is great to work with, always open to ideas and feedback. Grateful to be part of such a positive and growth-driven space!

    • Tamanna Malik
      Tamanna Malik Review from Google
      5.0

      Tamanna Malik's Review Sourced from Google

      Working with Evangelist Apps was a smooth and rewarding experience. The team communicated clearly throughout the project and brought great ideas to the table. They turned my vision into a functional, user-friendly app that exceeded my expectations. If you're looking for a team that delivers on time with top-notch quality, I’d definitely recommend them.

    • LIPIKA ROY
      LIPIKA ROY Review from Google
      5.0

      LIPIKA ROY's Review Sourced from Google

      I had a great experience with Evangelist Apps ! They were professional, knowledgeable & delivered exactly what I wanted. The app they made for me is fantastic and easy to use. I highly recommended them to anyone looking for mobile app development.

    Reviews verified by DesignRush and sourced from the agency's profile View All Reviews
  • Transform Your Ideas Into Profitable IT Solutions

    ITWEBS provides full-cycle software development, web and mobile application development, eCommerce platforms, DevOps, integrations, IT support, and dedicated development teams for businesses that need reliable digital solutions...

    Top Services:

    • eCommerce Development
    • Web Development
    • Software Testing
    • Staff Augmentation
    • Mobile App Development
    • Show more
    Location
    Warsaw, Poland
    Number of Employees
    50 - 99
    Average Hourly Rate
    $35/hr
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    4 Projects Listed

    ITWEBS Services

    • eCommerce Development
    • Web Development
    • Software Testing
    • Staff Augmentation
    • Mobile App Development
    • IT Services
    • IT Compliance Solution
    • Software Development
    • Digital Services
    • CRM Consulting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • eCommerce Industry
    • Education Industry
    • Retail Industry
    Data sourced from the agency's DesignRush profile
  • Your Partner In Digital Transformation

    ACME ONE is a Dubai-based technology consulting and software development company helping startups and enterprises build scalable digital products and modernize operations through high-performance software solutions...

    Top Services:

    • AI Development
    • Web Development
    • eCommerce Development
    • Software Development
    • Mobile App Development
    • Show more
    Location
    Dubai, United Arab Emirates
    Number of Employees
    100 - 249
    Average Hourly Rate
    $30/hr
    Minimal Budget
    $10,000 - $25,000

    ACME One Services

    • AI Development
    • Web Development
    • eCommerce Development
    • Software Development
    • Mobile App Development
    • Big Data Analytics
    • Staff Augmentation
    • Cloud Consulting
    • Software Testing
    • DevOps Consulting
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • GenRe
    • MMM
    • Patagonia
    Data sourced from the agency's DesignRush profile
  • Delivering Excellence.

    Atyantik Technologies Pvt. Ltd. is a leading software company in Vadodara, Gujarat, specializing in innovative digital solutions for clients across India. We offer a wide range of services, from UI/UX Design to enterprise applications, delivering customized, high quality solutions that enhance your digital...

    Top Services:

    • Software Development
    • CRM Consulting
    • ERP Consulting
    • IT Services
    • SEO
    • Show more
    Location
    Vadodara, India
    Number of Employees
    50 - 99
    Average Hourly Rate
    $35/hr
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    1 Project Listed

    Atyantik Technologies Private Limited Services

    • Software Development
    • CRM Consulting
    • ERP Consulting
    • IT Services
    • SEO
    • Web Design
    • Web Development
    • Software Testing
    • UI/UX Design
    • eCommerce Development
    Data sourced from the agency's DesignRush profile, its website, and other relevant accounts
    • WaveRFID
    • LUXE Global Awards
    • Fox Dealer
    • Drop Delivery
    • NuMessage AI
    Data sourced from the agency's DesignRush profile

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  

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