Top QA & Software Testing Firms

Releases that break checkout, a mobile app that crashes on older Android phones, an API that slows under load: these are the failures QA and software testing companies are paid to catch first. They plan test strategy, write and run manual test cases, build automated suites in Selenium, Playwright, Cypress or Appium, and run performance, security and accessibility tests. Software teams hire them when developers are testing their own code, when release cycles are speeding up, before a major launch, or when an audit demands documented testing.

When comparing the firms below, look at the kinds of applications they test, the automation frameworks they work in, and whether testers join your sprints or work from a separate queue.

How this list is built

We evaluate companies on verified profile data: services, pricing, locations, and portfolio. Client reviews are being collected. We may earn a fee for some placements. How we rank and verify

4,562 Companies

List of the Best QA & Software Testing Agencies

Reflexions
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Reflexions is a digital innovation lab located in New York City. We create and develop digital platforms for some of the most progressive organizations, institutions, and brands globally. Established in 1999, we've built lasting partnerships with numerous clients, with some lasting over ten years. O
Highlights
$50,000+
Min Project Size
$150+/hr
Avg Hourly Rate
10-49
Employees
New York, New York, Us
Services Provided+6 Services
3% QA & Software Testing
6% Mobile App Development (iOS & Android)
5% Frontend Development
5% Backend Development
AI Summary
“Reflexions is a New York-based digital innovation lab since 1999, partnering globally to create engaging, agile digital platforms across diverse devices and industries.”
GVH Development
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We are a small web development firm located in Romania, providing high-quality solutions at competitive prices. Our engineers create adaptable and scalable web platforms aimed at enhancing client engagement, responsiveness, and efficiency. We are dedicated to understanding user motivation and behavi
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
40% Custom Web Application Development
25% Backend Development
25% Frontend Development
10% QA & Software Testing
AI Summary
“GVH Development is a Romanian web development firm delivering scalable, efficient applications using modern frameworks, automation, cloud optimization, and ongoing support to enhance user engagement.”
Xibis
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Since 1998, Xibis has been at the forefront of customized software development, creating innovative web and mobile applications across various industries such as retail, healthcare, and transportation. Our company has built a strong reputation for producing secure, high-quality applications for well
Highlights
$10,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Oadby, England, Gb
Services Provided
45% Custom Web Application Development
40% Mobile App Development (iOS & Android)
10% E-Commerce Development
5% QA & Software Testing
AI Summary
“Founded in 1998, Xibis specializes in secure, scalable custom software development, delivering innovative web and mobile applications across retail, healthcare, and transportation industries with full project lifecycle management.”
itera Labs
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Itera Labs is a technology firm committed to creating scalable systems that align with ambitious goals. We collaborate with organizations to design and develop strong digital platforms that optimize operations, reduce inefficiencies, and establish a basis for sustainable long-term growth. We firmly
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
15% Custom Web Application Development
13% API Development & Integration
5% E-Commerce Development
10% Mobile App Development (iOS & Android)
AI Summary
“Itera Labs partners with diverse organizations to develop scalable, efficient digital platforms and automation solutions that enhance operations, support growth, and foster long-term business innovation.”
AadvikTech
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At Aadvik Tech, we have over five years of commitment to excellence in software development, positioning us as leaders in the industry. We excel in creating dependable, scalable, and secure software solutions customized to your specific requirements. By prioritizing user-centered design, we combine
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Jaipur, Rajasthan, In
Services Provided+6 Services
8% Mobile App Development (iOS & Android)
4% QA & Software Testing
8% Custom Web Application Development
20% Cloud Consulting & SI
AI Summary
“Aadvik Tech delivers tailored, secure software solutions with expertise in development, digital marketing, and UI/UX design, enhancing brands through innovative, user-focused digital experiences.”
Mechlin Technologies LLC
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Welcome to Mechlin Technologies LLC—Your Pathway to Innovation and Excellence in IT Solutions! At Mechlin Technologies, we take pride in being a leading US-based IT firm that consistently provides state-of-the-art services in Website and App Development, Custom Software Solutions, Software Testing,
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
50-249
Employees
San Francisco, California, Us
Services Provided+3 Services
14% Custom Web Application Development
13% Mobile App Development (iOS & Android)
7% QA & Software Testing
13% Product UX Strategy
AI Summary
“Mechlin Technologies LLC is a US-based IT firm specializing in innovative website, app development, custom software, UI/UX design, and comprehensive software testing services to enhance digital transformation.”
Bigscal Technologies Pvt Ltd.
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Bigscal is a software development outsourcing firm that focuses on providing affordable custom software solutions tailored for businesses. We offer services such as mobile app development, SaaS solutions, complex web portals, application development, and business process automation to clients global
Highlights
$1,000+
Min Project Size
< $25/hr
Avg Hourly Rate
50-249
Employees
Surat, Gujarat, In
Services Provided+3 Services
15% Custom Web Application Development
13% Mobile App Development (iOS & Android)
5% E-Commerce Development
7% QA & Software Testing
AI Summary
“Bigscal Technologies Pvt Ltd. delivers affordable, end-to-end custom software, mobile apps, BI, cloud, and automation solutions globally, emphasizing long-term client support and diverse industry expertise.”
Sonatafy Technology
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Sonatafy Technology installs accountable software delivery systems that turn roadmap promises into shipped software. Headquartered in Scottsdale, Arizona, with senior engineering teams across the US and Latin America, Sonatafy was founded in 2020 and built on an engineering organization established
Highlights
$50,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
50-249
Employees
Scottsdale, Arizona, Us
Services Provided+9 Services
4% Frontend Development
6% Custom Web Application Development
3% Code Review & Technical Audits
4% Mobile App Development (iOS & Android)
AI Summary
“Sonatafy Technology delivers accountable software systems with senior US and LATAM engineers, offering consulting, managed delivery, and AI solutions, achieving significant efficiency and growth since 2020.”
Codevia LLC
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We create mobile and web applications that enhance your business. From conception to launch, our team provides dependable digital solutions.
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
2-9
Employees
Services Provided
40% Mobile App Development (iOS & Android)
10% E-Commerce Development
40% Custom Web Application Development
10% QA & Software Testing
AI Summary
“Codevia LLC develops reliable mobile and web applications, offering comprehensive digital solutions from concept through launch to enhance business operations and growth.”
OSSystem
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OSSystem offers expert web and mobile development services that address IT challenges of various sizes and complexities. Since 2007, we have effectively supported both start-ups and large corporations. Our team specializes in developing modern and all-encompassing solutions for businesses using a di
Highlights
$25,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+5 Services
7% QA & Software Testing
12% Mobile App Development (iOS & Android)
5% Legacy System Modernization
10% Custom Web Application Development
AI Summary
“Founded in 2007, OSSystem provides expert web and mobile development services, delivering tailored digital solutions to startups and large corporations across diverse technologies.”

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