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List of Best Functional Regression Testing Service Providers

  • QA Mentor

    CMMI appraised, ISO certified Testing Company
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    QA Mentor is multi-awards winning a CMMI level 3 and ISO-certified leading software testing company founded in 2010 with headquarters in New York, USA. The company excels in delivering superior Software Quality Assurance (QA) with their 30+ QA testing services that are availed by clients like Bosch, Morgan Stanley, Ama ... read more about QA Mentor

    "Very professional and solid"
    Lindsey Allard, Co-Founder at PlaybookUX
    < $25/hr
    250 - 999
    2010
    United States, India
  • Impact QA services LLC

    Software Testing and Quality Assurance Company
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    ImpactQA is a leading independent software testing services company based in New York, USA. The company is a global provider of full-cycle software testing and consulting services catering to various industries such as Healthcare, Telecom, Media, E-commerce, and banking worldwide. Their premier clients include Panasoni ... read more about Impact QA services LLC

    "Quality Assurance services: Recommended for the price but need good communication channels"
    Alister Cedeno, QA Manager at Teamflow
    $25 - $49/hr
    250 - 999
    2011
    United States, United Kingdom
  • QualityLogic

    Industry Leading Software Testing Company
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    QualityLogic is a US-based software testing service providing turnkey testing and quality assurance solutions like regression testing, onshore automation testing, website testing services, interoperability testing, and more since 1986. Their talented and experienced QA team has served premium clientele, including HP, A ... read more about QualityLogic

    "Thorough and professional user acceptance testing services for software implementation"
    Jennifer Dunn, Co-Leader at Woligo
    $25 - $49/hr
    50 - 249
    1986
    United States, Australia
  • Binmile Technologies

    Product Engineering & Software Development Company
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    Binmile is a Product Engineering & Custom Software Development Company with offices across the globe.We are an enterprise software engineering company that helps organizations implement their digital journeys at speed. An ISO 9001:2008 & 27001:2013 certified company, strengthened by our unique Global Deliv ... read more about Binmile Technologies

    "Skilled, transparent & professional team"
    Daniel Prince, Product Manager at Veranda Learning
    $50 - $99/hr
    250 - 999
    2017
    India, United States
  • SHIFT ASIA

    Quality and Security Assurance Company in HCMC
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    SHIFT ASIA is a leading software testing and quality assurance company based in Vietnam and was founded in 2016. With their team of QA experts and professional full-stack engineers, they specialize in offering a wide range of QA services, including ad-hoc testing, vulnerability testing, GUI testing, etc.

    "Development & Testing for WordPress feature about task and Q&A management"
    YUSHI KODAMA, General Manager at Jienie Lab ASIA. Co., Ltd
    < $25/hr
    50 - 249
    2016
    Vietnam, Singapore
  • HikeQA is one of the top USA-based independent software testing services companies. This QA agency provides exceptional testing services, including Functional testing, performance testing, App testing, and Web testing. They provide 24/7 customer support and claim a money-back guarantee to dissatisfied clients.   ... read more about hikeQA

    "Very nice experience and quality of services is very good"
    Sonal Tripathi, manager at HikeQA
    < $25/hr
    10 - 49
    2020
    India, United States
  • Testlio

    Amazing customer experiences start here
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    Testlio is the leader in managed app testing. With robust client services, a global network of expert testers, and a comprehensive software platform, we provide a suite of burstable, flexible, and on-demand testing solutions: end-to-end, usability, localization, functional, payments, and more. When apps must perfo ... read more about Testlio

    "They have cost effective means of testing "
    Anonymous
    $25 - $49/hr
    50 - 249
    2012
    United States, Germany
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  • Get more from outsourced QA services – keep your software testing under control UTOR is an easily managed Software Testing company that helps growing product and development agile teams to implement their business ideas. We extend your in-house QA capabilities, automate where possible, bring in the rig ... read more about UTOR - QA services and Software Testing company

    "Delivered above and beyond my expectations, I look forward to our next engagement"
    Michael Kelly, CEO & Founder at Regenerative by Community
    $25 - $49/hr
    10 - 49
    2016
    Estonia
  • KiwiQA Services

    One Click Away from finding experience QA agency
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    KiwiQA Services is an Australia based quality focused & knowledge-centric firm. KiwiQA Services, offers a wide range of testing solutions and services across industry domains, with a primary focus on risk management and implementable solutions. KiwiQA is dedicated to “Quality” to provide world-class tes ... read more about KiwiQA Services

    "Excellent QA Service"
    Scott Hunley, Devops Manager at Long Tail Technology
    < $25/hr
    50 - 249
    2009
    Australia
  • Testscenario, founded in 2014, is a one-stop shop for all of your QA needs and desires.We are a passionate Software testing firm that provides a wide range of customers with Quality Assurance Software testing services.Testscenario is a specialist QA and testing firm with more than 8 years of experience in the field

    "Salesforce QA Automation"
    Nihar Sharma, CEO at NSIQ INFOTECH PVT LTD
    $25 - $49/hr
    10 - 49
    2014
    India
  • DeviQA

    Our Quality - Your Efficiency
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    DeviQA is one of the global leaders in the Quality Assurance and Testing market since 2010. We are the finalist of the Software Testing Award in the nomination "Best Test Automation Project – Functional.". Twelve judges choose a few finalists among hundreds of participants around the globe. Our offer ... read more about DeviQA

    "DeviQA > Experience working with QA out-stuff "
    Yana Kushnareva, Scrum Master at Grover
    $25 - $49/hr
    50 - 249
    2010
    Poland
  • QATestLab

    Manual and Automated testing
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    QATestLab is an international QA and testing provider with headquarters in Cyprus and R&D centers in France, Poland, Cyprus, and Ukraine. We have 18+ years of experience delivering high-quality testing services for our partners working in such business domains as Software Development, Gaming, Business Solutions, E- ... read more about QATestLab

    "QATestLab team was good at communication and highly professional."
    Viacheslav Chernenko, Director of Business Development at Pragmatic DLT at Pragmatic DLT
    < $25/hr
    50 - 249
    2005
    Ukraine
  • Newwave Solutions Jsc

    Top 10 Software & Blockchain Company in Vietnam
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    Newwave Solutions ranked among the top 10 software companies in Vietnam and is recognized globally as one of the top 100 sustained software companies. With 12 years of experience and a dedicated team of over 300 members, we're committed to excellence. WHAT WE'VE ACHIEVED: 🏆 Vietnam's Top 10 ICT Com ... read more about Newwave Solutions Jsc

    "Mobile App Development"
    Evelyn Martinez, Sales Manager at Driscoll's at Driscoll's
    NA
    250 - 999
    2011
    Vietnam
  • TECUNIQUE PRIVATE LIMITED

    Elevate Your Business with TECUNIQUE's Tailored
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    TECUNIQUE, a distinguished Indian software services company with over 14 years of industry experience, is a growing leader in the realm of offshore software development and quality assurance services. Our unwavering commitment to excellence has positioned us as a trusted partner for start-ups, software development comp ... read more about TECUNIQUE PRIVATE LIMITED

    "A true partner"
    Guillaume Brejaud, COO at oppScience at OPPSCIENCE
    NA
    50 - 249
    2010
    India
  • BugRaptors

    Leaders in Software Testing & QA Services
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    BugRaptors – Improve Your Chances of Success with QA Solutions   Discover excellence in QA software testing services with BugRaptors, a renowned industry leader since 2016. Armed with ISO 9001:2018 and ISO 27001 certifications, our innovative approach to quality engineering solutions propels digital ... read more about BugRaptors

    "Greate team providing excellent QA/Testing services and development assistance along with potential improvements."
    Mohit Gupta, Technical Product Manager | Machine Learning Engineer at Timble Technologies Pvt Ltd
    < $25/hr
    250 - 999
    2016
    India
  • Exoft is a software development company that provides solutions to various business needs. After our first meeting in 2013, our team of skilled IT experts has built more than a hundred software systems regardless of their types and complexity. Fortunately, our numerous success stories speak for themselves. Since we con ... read more about Exoft

    "Professional, Solid Software Development Company With Strong Processes and Friendly Staff"
    Colin Stone, CTO & Product Architect at ANALEC
    $25 - $49/hr
    50 - 249
    2013
    Ukraine
  • Relevant Software

    Web&Mobile Apps Development | Dedicated Engineers
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    Relevant is an international software development company that designs, builds and delivers products of world-class standard for Fortune 500 companies and promising startups. We provide software development teams made up of the best engineers from around the world, benefiting globalization and diversity.  More ... read more about Relevant Software

    "High professionalism, great resource management and engagement with the project"
    Julia Orlovska
    $25 - $49/hr
    50 - 249
    2013
    Poland
  • Savarian.tech

    Get Your Software Testing Done with Savarian.tech
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    Savarian is a progressive, experienced team that offers flexible terms and affordable software testing services of any kind and purpose for clients worldwide.We are flexible in cooperation with clients and can set up teams based on your business needs and the types of testing you require: from regression to user a ... read more about Savarian.tech

    "Savarian.tech provided us with an in-house testing team that helped us improve our internal processes and increase the quality of products we work on."
    Yurii Maslov, CTO at DigitalSuits
    $25 - $49/hr
    10 - 49
    2019
    Poland
  • Testvox

    Software Testing Service Company
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    Testvox was founded with the goal of creating a venue that offers full software testing services. Since 2017, we've evolved from a tiny startup to a team of highly skilled engineers dedicated to achieving our objectives. We have successfully completed projects with national and international clients in India, the U ... read more about Testvox

    "Good quality service"
    John T. Emmatty, Founder/CEO at Hurry
    < $25/hr
    10 - 49
    2017
    UAE
  • OKQA

    More than just testing
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    Why OKQA is more than just testing? We are not a company that comes and goes. We are a QA team that can become your long-term partner for on-demand software testing or ongoing QA tasks.We do not only provide manual and automation software testing services. We deliver comprehensive QA audits for e-commerce businesses ai ... read more about OKQA

    "Outstanding with exceptional attention to detail when it comes to testing"
    Leo J Barnett, Founder & CEO at Reelshot - Pro camera & video editor
    < $25/hr
    2 - 9
    2020
    Ukraine
  • KMS Solutions is a premier technology consulting and solutions provider that empowers BFSI enterprises to optimize operations, drive innovation and help them enhance their product & service offerings through the seamless integration of cutting-edge technologies and tailored solutions. To learn more about KMS Sol ... read more about KMS Solutions

    "We need a tool to help us gain better insights into how users engage with our digtal product. KMS Solutions recommended a product analytics solution t"
    Thuan Do, Teacher Manager at Schola
    NA
    250 - 999
    2019
    Vietnam
  • Founded by a real QA tester BespokeQA has dealt with testing, structuring, creating solutions for more than twenty-five clients across ten industries for last more than one year. Our mission is to help clients make distinctive, lasting and substantial improvements in their business and to continue building a great comp ... read more about BespokeQA

    "Reliable and Smart team"
    Vivek Kapoor
    < $25/hr
    2 - 9
    2019
    India
  • Outpost QA

    Your QA software test team in Mexico
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    We are a nearshore boutique Quality Assurance firm that focuses on helping your products reach your customers with maximum quality.Unlike other outsourcing companies, our testers integrate very tightly with your team, helping your developers reach their goals. Our rates are lower than hiring in the United States, ... read more about Outpost QA

    "Top notch Quality Assurance engineering team delivering tangible value at a very reasonable cost"
    Tyler Newman, Director Of Quality Assurance at at Owlet Baby Care
    $25 - $49/hr
    10 - 49
    2020
    Mexico
  • QTeam Software Solutions

    We are creating bespoke software solutions
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    Our purpose is to deliver complex digital solutions in web related industries like e-learning, e-commerce and social media marketing.Share with us your pitch and ideas, we learn your trade, we will involve our team, technologies, and techniques that will grow and raise your business. We have seen with each customer tha ... read more about QTeam Software Solutions

    "Top notch quality"
    Andrei Dobrin, QA Manager at at Zitec
    $50 - $99/hr
    2 - 9
    2016
    Romania
  • TestingXperts

    Next Gen Specialist QA & Software Testing Company
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    TestingXperts is a Next-Gen QA & Software Testing Services provider, co-headquartered in London, UK and Harrisburg, PA in the USA, with offices in the Netherlands, USA, Singapore and offshore test labs in India. TestingXperts’ comprehensive suite of testing services covers Test Advisory, Functional and Non-Fu ... read more about TestingXperts

    NA
    1,000 - 9,999
    2013
    United States
  • test IO

    Fast QA Testing as a Service
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    As a global leader in software crowdtesting, we enable fast moving software development teams with a platform for on-demand QA testing throughout the entire development cycle. Test setup takes just minutes, and we dynamically allocate human testers in real-world conditions to fit your specific testing needs. No more QA ... read more about test IO

    "Excellent team. Value for money!"
    Nick woods
    $50 - $99/hr
    10 - 49
    2011
    United States
  • Hawking Bros is a leading Russian outsource web-development company. Our company was founded in 2014 in Vladimir city. Over 5 years of work, we have assembled a strong team of specialists and gained experience in developing projects for various industries. Our portfolio includes joint work with leading global adve ... read more about Hawking Bros

    "Hawking Bros is really excellent and professional web development team!"
    Павел Райков
    $25 - $49/hr
    50 - 249
    2014
    Russia
  • SumatoSoft

    We help companies digitalize their businesses.
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    SumatoSoft builds complex custom software to help companies apply the best IT innovations to meet their goals through business digitalization.  5 key points we follow and stand for:  Focus first on the business value delivery; Make the software delivery process transparent and predictable; Use on ... read more about SumatoSoft

    "Sumatosoft is an amazing firm with Talented Designers, Architects, and Developers"
    David Logan, Managing director at Umergence
    $50 - $99/hr
    50 - 249
    2012
    United States
  • DataArt

    Enterprise Software Development Company
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    Founded in 1997, DataArt is a global software engineering firm that has continually evolved to become the trusted technology partner of market leaders. Led by our people-first principle, our world-class team designs and engineers data-driven, cloud-native solutions to create immediate and enduring business value. Throu ... read more about DataArt

    "Long-lasting technology partnership with DataArt"
    Justin Baker, Senior Director of Engineering at Apple Leisure Group
    $50 - $99/hr
    1,000 - 9,999
    1997
    United States
  • XBOSoft

    Software Quality Improvement
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    XBOSoft is a top-rated software testing and QA company. Their mission is to deliver trust while providing software quality assurance and testing beyond the expected standard. What they test, includes web application testing, API testing and mobile application testing in various industries ranging from healthc ... read more about XBOSoft

    "Xbosoft's software testing services are exceptional!"
    Jessica Bernstein, CEO and Founder of Universally Found at Universally Found
    NA
    50 - 249
    United States
  • Bladeware

    Trusted Software Design & Development company
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    Bladeware is an award-winning software Design & Development company that helps many businesses around the world - from small startups who need to build an MVP to mid-sized businesses who has a need in IT services and digital transformation. During the last 5 years being on the market we built and deliv ... read more about Bladeware

    "Roman & the Bladeware team were absolutely incredible. They far exceeded my expectations and delivered incredible designs for the app"
    Corey Kuether, Senior Android Developer at booj
    $50 - $99/hr
    10 - 49
    2018
    United Kingdom
  • Mindful QA

    American Software Testing Company - 10% to Charity
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    Award-winning American software testing company with a mission to do good. From donating 10% of profits to charity to being the first carbon neutral QA company, Mindful QA is proud to fuel progress while improving usability for millions of users. Mindful QA has been featured on over a dozen "best software testing ... read more about Mindful QA

    "Skilled, Experienced, and Easy to Work With!"
    Jeff Broussard, CTO at at Wonderwall Consulting
    $50 - $99/hr
    50 - 249
    2018
    United States
  • Merged Minds

    Professionals with young hearts and open minds
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    Merged Minds is a software testing service provider, focusing on supporting projects quality assurance using manual and automated test tools.Our experience goes way back to 2006 with the Merged Minds brand founded in 2017.We can support any software projects using our knowledge covering Functional (ad-hoc, browser comp ... read more about Merged Minds

    "Excellent team work"
    Clarence Jacobson, Test Manager - Contractor at Freelancer
    < $25/hr
    2 - 9
    2017
    United Kingdom
  • TestDel has developed its services for companies wishing to outsource all or a portion of their software quality activities so they may gain testing efficiencies and reduce administrative burdens associated with in-house QA teams. An established and trusted brand with a global presence and network. TestDel delivers Ons ... read more about Testdel UK LTd.

    "Health Care Industry "
    Lisa Barnett
    NA
    50 - 249
    2016
    United Kingdom
  • DOIT Software

    Mobile Apps, Software Development & Staffing
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    -DOIT Software is your technology satellite for sustainable growth.  We offer: 1. Development of  Mobile Apps & Custom Software Development from scratch. DOIT Software can help you to evolve an idea and create a solution from the concept. 2. IT Staff Augmentation and ... read more about DOIT Software

    "Extremely high quality developers and communication"
    Michael Gordon
    $25 - $49/hr
    10 - 49
    2014
    Ukraine
  • Tesvan

    Manual and Automation QA Outsourcing Services
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    Introducing Tesvan LLC: Your Go-To Partner for Innovative Testing and Development Solutions! 🚀 Experience: Over 4 years of excellence in outsourcing services. Specializing in premium software testing and development solutions tailored for global clients. 👩‍💻 Our Team: P ... read more about Tesvan

    "Excellent team and always available !"
    Nina Antonyan
    $25 - $49/hr
    10 - 49
    2019
    Armenia
  • Rocketlab is a Swiss-based company that provide experienced software test engineers to small to medium sized businesses within Switzerland, Germany and Europe.Headquartered in Tallinn (Estonia) - known as the most advanced technology spot in Europe, and Zurich (Switzerland) around 100 outstanding and experienced test e ... read more about Rocketlab

    "Excellent QA partner for various projects"
    Peter Hans Baumann
    $50 - $99/hr
    50 - 249
    1994
    Switzerland
  • CyberIt

    Our experience is your guarantee
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    CyberIt is founded by people who have been working for long time within the Global IT industry. Founders have been helping both big and small companies to achieve their technical and business goals for more than 20 years. Within IT we have been contributing in the forefront and have been introducing and using the most ... read more about CyberIt

    "Reliable company"
    Donatas Zaveckas, CEO at BTT Group
    $50 - $99/hr
    2 - 9
    2017
    Norway
  • Manual and automation testing, QA teams dedication, and staff augmentation services for product companies and IT vendors.  Working on an innovative project and need help with QA processes setup or comprehensive testing? Want to extend your growing team with QA specialists? Get a reliable QA partner for on-deman ... read more about HireTester

    "HireTester is awesome"
    Vitor Argos, Project Manager & Customer Support at NameMobiLoud
    < $25/hr
    10 - 49
    2014
    Ukraine
  • Modelit

    We implement Salesforce solutions
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    Our services include Salesforce Custom Development, Salesforce Configuration, and building apps for the Salesforce AppExchange. At Modelit, we take care of all the aspects to implement a new system, configure a current set up, or build an application. Our team of Salesforce Certified Developers, Administrators, QA A ... read more about Modelit

    "Experts + Efficient + Reliable = Model IT"
    Cecilia Mescall
    $25 - $49/hr
    10 - 49
    2012
    Uruguay
  • MantraSys

    Consulting | Custom Apps | Testing
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    We deliver high-quality, scalable cloud and mobile apps on time and within budget. We are a USA company with expertise in financial, healthcare, and Learning domains. All our projects are managed from our Alpharetta, GA office and are delivered globally. MantraSys is an IT solutions company based in the Atlanta metr ... read more about MantraSys

    "Best cloud apps development company"
    James Whitfield, Project Manager at Data Integration LLC
    < $25/hr
    10 - 49
    2006
    United States
  • twoiq LLP

    Technology with Optimum IQ
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    We are a fast-growing multiskilled IT Consultancy Firm located in Ahmedabad. We are focused on solving business problems and providing simple smooth and creative IT solutions to the customer.We are a people-oriented company who are passionate about technology who will do wonders to help you out with the Digital Solutio ... read more about twoiq LLP

    "One of the best programming teams that I've worked with (and I've worked with a lot over the past 12 years) "
    Sameep Shah - Solutions Expert, Website & SEO Project Management at Simplewebdesign.net
    < $25/hr
    10 - 49
    2015
    India
  • TestUnity

    You Make Apps. We make them Better.
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    A SaaS platform, dedicated company for all kinds of software testing services need. A complete QA organization for on-demand scalable testing services need with all pre-defined well-set processes & procedures. A QA community with a pool of talented resources spread across the world to cater to the need of demanding ... read more about TestUnity

    "Plug and play solution via Resource -as -Is availability. Highly effective"
    Prashant Kanoo, Head of IT/CTO at DHS Arabia
    < $25/hr
    50 - 249
    India
  • Aspired

    Elite. Remote Team. On-Demand.
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    Aspired helps its clients hire and build a remote autonomous dedicated team by carefully selecting the elite from the global pool of talent.  Our team of experts identifies new & emerging tech hubs and pair our top engineers with teams engaged in solving thought-provoking problems. We provide complete opera ... read more about Aspired

    "Outstanding service, exceeded my expectations. Highly recommended!"
    Tim Rice, Co-founding CEO at Coin Metrics at Coin Metrics
    $25 - $49/hr
    50 - 249
    2020
    United States, UAE
  • AllianceTek is an award-winning software company founded in 2004. They provide premium quality testing services to various sectors such as transportation, education, social networking, logistics, and many more. Their prime clientele includes Johnson & Johnson, Pacific Life, Saint Gobin, Genpact, and more.   ... read more about AllianceTek

    "From start to finish, AllianceTek was hardworking and responsive providing quality work, expert insights, and great collaboration"
    Daneen Feehery, Management Analyst at Arlington County Fire Department
    $25 - $49/hr
    50 - 249
    2004
    United States, Canada
  • PieSoft

    Development as Easy as Pie
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    PieSoft is an international company based in Pennsylvania with satellite offices located in Poland and Georgia. How we assist you  We offer start-ups and companies a full spectrum of custom software and hardware development services to achieve business continuity, agility, and efficiency. PieSoft in numbe ... read more about PieSoft

    "With the introduction of PieSoft's CRM, we've been able to manage and enhance our production"
    Laura Cerezo, Director at GistOp
    $25 - $49/hr
    50 - 249
    2012
    United States
  • NMG Technologies

    Transforming Startups into Industry Leaders
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    NMG is a globally recognized digital solutions powerhouse, specializing in full-cycle software development since 2008. With over 15 years of expertise, we serve a diverse clientele, from NASDAQ-listed corporations to innovative startups, delivering solid solutions within budget and timelines. Our team comprises over 15 ... read more about NMG Technologies

    "Highly recommend them as Best Mobile App Developers"
    Jeremy Tillman, Founder & CEO at Tillman Learning LLC
    $25 - $49/hr
    50 - 249
    2008
    United States, India
  • MobiDev

    Web and Mobile development, AI apps
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    To create a game-changing product, there’s a need to mix traditional software development and innovation. MobiDev is an award-winning software engineering company that delivers both classic and AI-powered Web and Mobile apps from scratch or integrates AI/ML components into existing systems. We offer you t ... read more about MobiDev

    "It was very positive experience..."
    Satoru Isaka, CEO, Founder at Vision del Mar, LLC
    $50 - $99/hr
    250 - 999
    2009
    United States
  • Prismetric

    Delivering Quality Products and Premium Services
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    Prismetric is an ISO 9001:2015 Certified Mobile App Development Company having a development center in India with offices in USA & Saudi Arabia that offer exceptional applications development for iPhone, iPad and Android devices along with other web services to provide end-to-end solutions. We have a strength of ov ... read more about Prismetric

    "They developed restaurant based website and app for us"
    Vivek Singh
    < $25/hr
    50 - 249
    2008
    India
  • Chapter247 Infotech

    Software Dev | Cloud Consulting | Web | AI | IOT
    Visit website

    Chapter247 is a leading digital transformation company providing cutting-edge engineering solutions to organizations. By influencing the lives of 100+ million users our presence in the US, UK, Australia, and many countries has spearheaded the need for a technology revolution.  As a collaborative partner, we aid ... read more about Chapter247 Infotech

    "They demonstrated commitment, conviction and perseverance."
    Hank Warner, Founder at at Flowhaus
    < $25/hr
    50 - 249
    2012
    India
  • ReliablePSD LLC

    You run your agency. We’ll handle your code.
    Visit website

    Get clean, stress-tested code. Service so good, it’ll make you smile. And a team that will never leave you hanging. How do we differ from other design to code companies?  Two important ways:  1. Quality Assurance and Testing  We have a 3-layered intensive testing and quality assurance p ... read more about ReliablePSD LLC

    "Reliable company with reliable chief"
    Albína Kaškarová
    $50 - $99/hr
    10 - 49
    2014
    United States

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Regression Testing vs. Unit Testing: Key Differences

FeatureRegression TestingUnit Testing
DefinitionVerifies that existing functionalities haven't broken due to code changes or new features.Tests individual units of code (functions, modules) in isolation to ensure they work as expected.
FocusSystem behavior after changes, preventing regressions.Individual code units and their correctness.
TimingPerformed after any significant code change (bug fix, new feature) before deployment.Usually conducted early in the development cycle, after code is written.
Test casesDesigned to cover existing functionalities that changes might impact.Focused on specific code units and their expected outputs for various inputs.
Tools usedAutomated testing frameworks and regression testing tools.Automated testing frameworks, mocking frameworks.
OutcomeIdentifies regressions caused by changes and ensures existing functionality remains intact.Determines if individual code units function as expected, catching bugs early in development.
ExampleTesting if a new login feature affects existing user functionalities like profile management.Testing if a function calculating shipping costs produces the correct output for different addresses and weights.
FrequencyConducted regularly, especially after code changes, updates, or system enhancements, to detect regressions.Typically performed whenever a unit of code is written or modified to ensure the correctness of the code.
DependenciesDependent on the accuracy and completeness of the regression test suite to provide reliable results.Dependent on the correctness and effectiveness of the unit test cases to ensure proper functioning of the code.