Industry Leaders
Top-right · Both axes ≥ 50
2FIRMS
Strong on both Core Competencies and 360-Performance. These firms have proven track records, deep specialisation, and solid client outcomes. Default recommendation for most buyers.
Best Software Testing Companies in California
Goodfirms has reviewed 241 Software Testing Companies in California as of September 2026. The top-ranked firm is QA Mentor (5.0 stars, 8 verified reviews, < $25/hr, founded 2010, San Francisco). Across the category, the median hourly rate is $37, median client rating is 4.9, and 56% of firms employ 50+ members. Explore the vetted Software Testing Companies in California below, compare their strengths, and connect with the provider best suited to your requirements.
Searching for software testing service provider companies in California? For startups, outsourcing testing needs help to enter the market without any problems and gives a positive first impression. The new firms also can save on a whole budget of hiring a team by outsourcing an expert team from top testing companies in California. It also helps in building an effective plan for the employees. The professionals help the firm to understand client demands and hence assist in creating the software as per their requirements. Therefore, opting to select from the best testing services in California proves beneficial for startups. Goodfirms, after thorough research of different firms, has made a rundown of the best amongst them. Below is a list of the top software testing companies in California.
Goodfirms has verified 241 Software Testing Companies in California - part of 5,425+ Software Testing Companies, each passing Goodfirms' 4-step verification process (background check, client interviews, portfolio audit, ongoing quality review). Listings marked "Sponsored" are agencies that pay for premium placement - sponsorship does not affect star ratings or review content.
Top 10 at Glance
Compare the highest-ranked firms first side by side.
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List of Software Testing service provider companies in California
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Founded in 2010, QA Mentor is an ISO-certified, top software testing company having experience of working with 450+ clients globally. The company has a powerful team of 350 QA professionals that has delivered 3000+ projects to date, making them a reliable choice for a wide ... read QA Mentor reviews & insights
< $25/hr250 - 9992010San Francisco, United StatesReliable QA
- Partner
A1qa is an experienced software testing services company that has delivered over 1500+ projects to clients from 39 countries. With over 1100+ specialists onboard, the company excels in full-cycle testing services, quality engineering, and complete test coverage solutions using a combination of top quality engineering ... read a1qa reviews & insights
$25 - $49/hr1,000 - 9,9992003San Francisco, United StatesSoftware testing professionals who helped us get ready for HIPAA certification
- Senior Computational Biologist
Established in 2011, Packetlabs is another leading software testing and consulting company known for uncovering the vulnerabilities that others miss to identify. It is a CREST-certified and SOC 2 Type II-accredited penetration testing company. By leveraging an attacker-modeled approach, the company aims to deliver all ... read Packetlabs reviews & insights
$200 - $300/hr50 - 2492011San Francisco, United StatesPacketlabs always exceeded my expectations for the services they’ve delivered
- Anonymous
Testmatick is an end-to-end software testing company that specializes in delivering comprehensive QA testing solutions to clients from diverse industries. Established in 2009, the company has identified over 1 million bugs. From mobile and web app testing to QA audit, automated, and performance testing, the ... read Testmatick reviews & insights
NA50 - 2492009Los Angeles, United StatesComprehensive Software Testing for Web and Mobile Applications
- CEO
Using AI Tools
ChatGPT
Claude
Cursor
Windsurf
Perplexity
GenSoft is a full-cycle QA agency that helps digital teams ship better products through structured, end-to-end quality assurance. We work with companies that want to strengthen quality, reduce costly production issues, and make releases more predictable.We cover a wide range of testing services depending on ... read GenSoft reviews & insights
$25 - $49/hr10 - 492025San Francisco, United StatesGenSoft ensured our industrial software matched the legendary reliability of our hardware.
- User Experience DesignerWhy GenSoft?
- Automation-first QA partner
- End-to-end testing expertise
- Average project start in 2 days
Using AI Tools
GitHub Copilot- ChatGPT
- Cursor
PERSOL CROSS TECHNOLOGY VIETNAM We aim to be an IT company where each and every employee embraces our group culture of “Work and Smile”. By Leveraging technology, we create innovative solutions through the synergy of various cultures & lifestyles and contribute to the growth and ... read Persol Cross Technology Vietnam reviews & insights
< $25/hr50 - 2492013Los Angeles, United Statesknowledgeable & efficiant
- AnonymousWhy Persol Cross Technology Vietnam?
- Backed by PERSOL Group's massive global network.
- Japanese-Grade Quality, Compliance & Governance.
- Skilled, Proactive Team & Clear Communication.
Using AI Tools
- Claude
- LangChain
- Kubernetes
EffectiveSoft is an AI-enabled product engineering company that builds and evolves digital products and enterprise systems built for long-term use, operational complexity, and continuous change. We combine software engineering, UX expertise, and AI capabilities to help companies develop systems that remain reliable as requirements evolve, ... read EffectiveSoft reviews & insights
$50 - $99/hr250 - 9992003San Diego, United StatesThey were very flexible, and I’ve been very impressed with their adaptability.
- AnonymousWhy EffectiveSoft?
- Practical AI, not prototype-only solutions
- Experience across regulated industries
- Hands-on delivery, not advisory-only work
Using AI Tools
- Claude
PFLB is a performance and load testing company. Since 2008 our 150+ performance engineers have run load, stress and reliability testing for 300+ companies - banks, retailers, SaaS vendors and public sector systems.We find the limit of a system before its users do. Load profiles ... read PFLB reviews & insights
$50 - $99/hr50 - 2492008Mountain View, United StatesLoad testing of our Electronic health record software
- General ManagerWhy PFLB?
- Performance testing is all we do, since 2008
- 150 performance engineers, 300 companies
- Own cloud platform - first results in days
Using AI Tools
- ChatGPT
- Claude
Gemini- Perplexity
Accedia is a premier European IT services company, specializing in technology consulting and custom software development. Founded in 2012 in Sofia, Bulgaria, Accedia has established itself as a trusted global technology partner, recognized for its exceptional team culture and commitment to excellence.With a global presence ... read Accedia reviews & insights
NA250 - 9992012San Francisco, United StatesWe've been thoroughly impressed with the consistently excellent service this company provides
- Head of TechnologyWhy Accedia?
- 91 client retention, 13 years on the market
- ISO and TISAX certified, NPS 81
- Top 100 IAOP global service provider 2024-26
Using AI Tools
- GitHub Copilot
- Cursor
Lovable- Perplexity
- Claude
- + 2 More
Gearheart is a product development studio specializing in operational workflow-heavy B2B SaaS platforms — the kind where permissions, data isolation, and workflow logic determine whether the product actually holds up at enterprise scale.We engage at the start of a build, or when a product has ... read Gearheart reviews & insights
$50 - $99/hr10 - 492012San Francisco, United StatesThe best team to work with as a first-time start-up founder!
- FounderWhy Gearheart?
- 14 Years in B2B SaaS
- Senior-Only Team
- Enterprise-Level Expertise
Using AI Tools
- Claude
- ChatGPT
- Perplexity
inVerita is a global custom software development, AI development, and data company with core expertise in building complex digital health software, medical IoT, pharmacy, supply chain, retail, and fintech. We offer expert solutions in AI, data analytics and business intelligence, cloud and embedded systems, IoT, ... read inVerita reviews & insights
$25 - $49/hr50 - 2492015San Francisco, United StatesA highly productive and detail-oriented team delivering modern, high-quality web solutions.
- AnonymousWhy inVerita?
- We are an AI-native, OpenAI Select Partner
- Running over 10 Certified Anthropic Architects
- Data focused Snowflake Partner
Are you looking for website design and development, mobile app development (Android & iPhone) Solutions for your project needs? TOPS Technologies is one of the highly competent software solution provider in the field of Web, Mobile based Application Development and other IT integrated services. Our ... read TOPS Technologies reviews & insights
< $25/hr50 - 2492008Mountain View, United StatesSecure your future – start learning today with TOPS Technologies!
- eduction
ALLSTARSIT is an international Software R&D, Technical Support, and Talent Acquisition service provider established in 2004. Headquartered in Warsaw, Poland, ALLSTARSIT operates development hubs across the whole CEE Region (Poland, Ukraine, Czech Republic, Romania, and Bulgaria), Israel, and Dubai. Additionally, ALLSTARSIT has Tech Customer Support ... read ALLSTARSIT reviews & insights
NA1,000 - 9,9992004San Francisco, United StatesALLSTARSIT evolved into a true strategic partner committed to our growth.
- BDM
Solvd, Inc. is a global software engineering company with over 800 engineers located across 8 countries in North America, South America and Europe. Solvd, Inc. is headquartered in Roseville, CA (USA), and has development centers in USA, Argentina, Brazil, Mexico, Poland and a sales office ... read Solvd, Inc. reviews & insights
$25 - $49/hr250 - 9992011Walnut Creek, United StatesOutstanding Quality Assurance Services for an IT Digital Marketing Agency
- Co-Founder and Marketing Consultant
Spiral QA gives companies the software testing and quality assurance support they need to create better, more user-friendly web and mobile applications. For over 9 years, our dedicated team of software testers and quality assurance specialists at Spiral QA has been helping businesses build confidence ... read Spiral QA reviews & insights
$25 - $49/hr10 - 492011San Francisco, United StatesWeb Application Testing Partnership
- Chief Knowledge Officer
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 ... read test IO reviews & insights
$50 - $99/hr10 - 492011San Francisco, United StatesExcellent team. Value for money!
- Nick woods
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 ... read Mindful QA reviews & insights
$50 - $99/hr50 - 2492018Los Angeles, United StatesSkilled, Experienced, and Easy to Work With!
- CTO
Using AI Tools
- Perplexity
- ChatGPT
- Claude
- Gemini
- GitHub Copilot
- + 5 More
SynergyTop is a global technology and software development company delivering end-to-end digital solutions across SEO, custom software development, mobile and web applications, and digital marketing. We specialize in building scalable, high-performance systems that align with business goals and drive measurable growth. Our expertise spans high-impact ... read SynergyTop reviews & insights
$25 - $49/hr50 - 2492014San Diego, United StatesA mutual journey that reached the destination we had hoped
- Managing Director, Kuhn CapitalWhy SynergyTop?
- HealthTech, EdTech & Renewable specialists
- Client-first approach with real results
- Scalable, secure & high-performance systems
Altoros, with headquarters in the United States, operates major development centers in Argentina and Poland. This enables the company to offer competitive rates, align with different time zones, and provide high communication and technological skills, making it a top choice for customers.Take your software products ... read Altoros Labs reviews & insights
$50 - $99/hr250 - 9992001Pleasanton, United StatesI'm really impressed
- Web Developer Specialist
Svitla is a global digital solutions company with over 20 years of industry experience. Since 2003, we have engineered more than 5,000 transformative solutions for our clients around the globe, bolstering their growth and competitive edge. Our mission is to advise and implement modern, sustainable ... read Svitla Systems reviews & insights
$25 - $49/hr1,000 - 9,9992003Corte Madera, United StatesClever Developers supported by a people focussed organisation
- Head of People & Office
ZUZEX means aesthetics, functionality, and conciseness in every single line of code. ZUZEX serves diverse industries and verticals, helping B2B and B2C companies create profitable digital solutions, from streamlined applications to high-performance enterprise systems.
$50 - $99/hr50 - 2492008Santa Rosa, United StatesVery reliable partner to build your software
- Head of Data Science & Analytics at Httpool
Softermii provides top-notch expertise and end-to-end services to achieve timely and cost-effective results for the web and mobile app development. We also take care of smart and quick MVPs, extensive QA services, and UX/UI design through our large team that operates on a world-class basis. ... read Softermii reviews & insights
$50 - $99/hr10 - 492010Studio City, United StatesThey are friendly & accessible whenever require assistance
- Managing Director
TechWize offers a wide range of IT services including ERP, and CRM (Salesforce, MS Dynamics, Oracle, Sage, Service Now) consulting, integration, implementation, and automation as well as Digital transformation (AIML, Business Intelligence, Marketing Automation, Web and Mobile Development). Our Accreditations: Salesforce Registered Consulting Partner Over ... read TechWize reviews & insights
$25 - $49/hr250 - 9992000San Francisco, United StatesWe foresee a successful partnership with TechWize.
- Anonymous
Using AI Tools
- Claude
- ChatGPT
- Gemini
Canva
Jade Global is a premier consulting, integration, and managed services partner helping enterprises modernize, innovate, and scale. Founded in 2003, we bring over two decades of engineering excellence, with 2,000+ professionals and 11 global offices, and have served 500+ clients across North America, Europe, and ... read Jade Global reviews & insights
NA1,000 - 9,9992003San Jose, United StatesJade Global's expertise helped modernize our operations, standardize processes, and create a scalable foundation for growth.
- Vice President, OperationsWhy Jade Global?
- 23 Years of Enterprise Expertise
- Deep Multi-Platform Technology Expertise
- Outcome-Focused Managed Services
DigitlHaus is an award-winning full-service eCommerce agency specializing in data-driven design, custom development, platform migrations, SEO and optimization. We exist to transform and grow mid-market and enterprise B2B and D2C brands by building custom eCommerce experiences that attract, engage and convert loyal repeat customers.
NA10 - 492014San Francisco, United StatesGood and reliable company
- Anonymous
Welcome to DevOpsProdigy, where we believe in the power of optimization! Let us take infrastructure support off your shoulders so you can focus on product development! We provide an individually tailored strategic solution to each of our clients. No matter how unique your infrastructure complexity ... read DevOpsProdigy reviews & insights
$50 - $99/hr50 - 2492008Sunnyvale, United StatesThey heed to our suggestions and discuss with us the best ways to improve the work processes.
- Anna Barinova
Sigli is a dynamic software development company specializing in Digital Product Development and Digital Transformation. We excel at turning innovative ideas into reality, providing end-to-end solutions that cover the entire development cycle, from concept to deployment. Our keen focus on delivering high-quality, scalable, and future-proof ... read Sigli reviews & insights
$50 - $99/hr50 - 2492015San Francisco, United StatesDeep technical expertise, proactive approach, and strong domain knowledge made the project a success
- CEO at Devox
Our teams have successfully delivered over 30+ AI projects, including cutting-edge predictive analytics pipelines. Deployed 20+ AI models on edge devices optimizing for real-time processing and in Data pipelines for batch processing .Our teams have cross-functional expertise in Mobile (iOS, Android, ReactNative), Fullstack, DevOps, delivering ... read GlobalNodes reviews & insights
< $25/hr10 - 492023Studio City, United StatesGlobalNodes automated our last-mile delivery and improved our app and system integrations.
- Senior Operations Project Manager
We provide CTOs, VPs, and Directors of software engineering premium staff augmentation services and can help in the following ways: Fast, Easy Recruiting & Onboarding gets devs on your team in 2 - 3 weeks without subjecting your team to lengthy screening and interviewing distractions ... read Admios reviews & insights
$50 - $99/hr50 - 2492005San Francisco, United StatesThe Only Crew I Trust
- Chief Technology Officer
ETEAM is a seasoned digital product agency specializing in transformative growth for different types of businesses, from VC-backed startups to the largest company in the world, for the last decade. We're best known for translating the complex world of digital development into clear and easy-to-understand ... read ETEAM reviews & insights
$50 - $99/hr50 - 2492016Irvine, United StatesA terrific experience with a contracted engineering team
- Group Product Manager
Awsmd is dedicated to redefining design and innovation. We specialize in crafting exceptional digital experiences that captivate, inspire, and transform businesses. Our expert team blends creativity with cutting-edge technology to deliver outstanding results across branding, web design, app development, and digital marketing. We believe in ... read Awsmd reviews & insights
< $25/hr10 - 492014San Francisco, United StatesMobile App Development for Tastysterra
- Co-founder
CMOLDS is a top-ranked San Francisco mobile app development company focusing on iPhone, iPad, and Android applications. Contact us now to discuss your project needs. A leading mobile app design and development company in the US for startups, B2B companies, and individual clients looking for ... read CMOLDS reviews & insights
$100 - $149/hr50 - 2492017San Francisco, United StatesIt's been an incredibly educational and positive experience working with my Cmolds partners.
- Stuart Shaffer
Optimizely is the world's leading optimization platform, providing website and mobile A / B testing and personalization for the world's leading brands.The platform's ease of use and speed of deployment empowers organizations to conceive of and run experiments that help them make better data-inspired decisions.
< $25/hr250 - 9992009San Francisco, United States
Keynote by Dynatrace is the leader in helping some of the world’s best known brands make every mobile interaction count.Keynote provides powerful cloud-based solutions for mobile app quality and performance, enabling companies to reduce complexity, speed time to market, integrate with agile development, and deliver flawless mobile experiences that delight and amaze customers.
< $25/hr250 - 9991995San Mateo, United States
Established in 1997, Qualitest Group is among the prominent software testing service providers popular for delivering innovative and scalable testing solutions. The company has a skilled workforce that can combine time tested delivery models with technology and business-driven quality engineering to deliver exceptional results with enhanced quality and efficiency.
NA1,000 - 9,9991997Santa Clara, United States
HeadSpin is the leading Digital Experience AI Platform that utilizes automation, AI, and analytics to unify end-to-end testing, performance optimization, and experience monitoring. HeadSpin empowers development, QA, operations, and product teams to deliver flawless digital experiences across all delivery channels.
NA50 - 2492015Palo Alto, United States
We are a software development agency focusing only on A/B test and Personalization Campaign development. We can build complex and high-quality tests in FunnelEnvy PRO, Optimizely X, Optimizely Classic, Adobe Test & Target, Google Optimize and VWO. We have assembled a talented group of Javascript developers, developed robust process and build technologies beyond what testing ... read BrillMark LLC reviews & insights
NA10 - 492017Union City, United States
Using AI Tools
- Claude
Pcloudy - The Real Device Cloud with Intelligence Most enterprise QA teams are stuck choosing between speed and security. Public clouds get flagged by InfoSec. Building an in-house lab takes months and costs a fortune. And testing on too few devices means bugs reach production before your team catches them. Pcloudy fixes that. Test mobile ... read Pcloudy reviews & insights
NA50 - 2492016Dublin, United StatesWhy Pcloudy?
- 5000 plus Real Devices for Accurate Testing
- AI-Powered Testing & Self-Healing Automation
- Enterprise-Grade Security & Scalability
QASource is a leading QA outsourcing & quality assurance company that delivers high-quality services using a hybrid onsite-offshore model that help organizations to enjoy the benefits of a full QA department without the associated setup cost and hassle. To learn more, log on to https://www.qasource.com/ or email at [email protected]
$25 - $49/hr250 - 9992002Pleasanton, United States
Centercode is the world's leading provider of Customer Validation software and services. We strive to help our clients build better products by effectively utilizing the voice of their customers. We also host a community of hundreds of thousands of eager testers who want to test your product and help you achieve better quality.
$100 - $149/hr50 - 2492001Laguna Hills, United States
Parasoft provides innovative tools that automate time-consuming testing tasks and provide management with intelligent analytics necessary to focus on what matters. Parasoft’s technologies reduce the time, effort, and cost of delivering secure, reliable, and compliant software, by integrating static and runtime analysis; unit, functional, and API testing; and service virtualization. Parasoft supports software organizations as ... read Parasoft reviews & insights
$50 - $99/hr50 - 2491987Monrovia, United States
Shasta QA is an American OurSourcing software-testing company with offices located in Northern California and the Midwest. We provide a competitive middle-ground solution for US-based outsourced QA services that includes a full spectrum of black-box and white-box strategies for software, website, and mobile device testing, project management, IV&V, usability testing, and technical documentation. Founded in ... read Shasta QA reviews & insights
$150 - $199/hr50 - 2492002Redding, United States
Your software users are deciding every day whether your software meets their quality expectations. The first step on the road to exceeding those expectations is to establish a process that will support the unique goals and needs of your organization.SQA² helps you to define and implement a more effective software quality assurance process. And we ... read SQA Square reviews & insights
$25 - $49/hr2 - 9Orange County, United States
QAonCloud provides complete Regression Testing services to ensure your software's stability and reliability. As a top Regression Testing company, we provide expert assistance to ensure that your apps work flawlessly after upgrades. Our specialized regression testing services emphasize finding any possible problems so you can develop software that meets high standards. With over 8 years ... read Regression Testing Services - QAonCloud reviews & insights
NA50 - 2492016Fremont, United States
AIS Technolabs is a full-service internet marketing and web designing firm. We employ a complete strategy that includes correct web design, thorough on-site SEO, quality content authoring, effective off-site SEO strategies, paid media, and analytics data to provide high-quality, quantifiable outcomes.Additionally, we have years of ... read AIS Technolabs reviews & insights
< $25/hr50 - 2492010Pacifica, United StatesRobust & Powerful Android App Development for a Consulting Agency
- Ethan Roy
Errna is a leading technology company specializing in the areas of niche technologies like blockchain consulting and development, cryptocurrency exchange development, smart contracts application development, digital tokens creation, ICO launching, and other related solutions. We have been helping businesses from all around the globe venture ... read Errna.com reviews & insights
$50 - $99/hr250 - 9992015San Jose, United StatesBest Choice for Blockchain Development
- Co Manager
Mendios Technologies delivers beautiful, full-function mobility solution for startups, medium-sized companies and large enterprises, in a fraction of the time it takes to build conventional mobile apps. We are committed to providing solutions that are simple to use and cost-effective, that meet the specific set ... read Mendios Technologies reviews & insights
$50 - $99/hr10 - 492011Sunnyvale, United StatesGood
- Sales & Marketing Intern
ThinkSys, an award-winning technology company, is a leading provider of Products and Software Development, QA and related services. Based in Sunnyvale, CA and offices in NOIDA, India. ThinkSys serves clients worldwide. We have been recognized among the fastest growing private companies in the US (Inc5000 ... read Thinksys reviews & insights
NA50 - 2492012Sunnyvale, United StatesMVP Development
- Chief People Officer at HealthHero
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The Magical Quadrant
Hover any bubble for the firm's exact scores. Filter the view using the controls on the right.
360-PERFORMANCE VIEW (Y) →
0255075100
Industry ContendersIndustry LeadersUpcoming AchieversMarket Influencers
0255075100
CORE COMPETENCIES (X) →
The four quadrants explained
Each card shows the count of firms in that quadrant and the top 5 by composite score.
Industry Contenders
Top-left · Y ≥ 50, X < 50
0FIRMS
Strong execution but broader service mix. High-quality generalists - good fit if your project crosses multiple disciplines in one engagement.
Market Influencers
Bottom-right · X ≥ 50, Y < 50
9FIRMS
Deeply specialised but with moderate market presence. Often the right pick when specialisation matters more than scale - boutique shops with deep technical chops.
Top 5 by composite score
1a1qa100 / 492Testmatick100 / 473Spiral QA100 / 334test IO100 / 315Mindful QA96 / 28Upcoming Achievers
Bottom-left · Both axes < 50
10FIRMS
Newer entrants and smaller boutiques. Higher risk but often the best price-performance - particularly for early-stage startups or non-mission-critical projects.
Top 5 by composite score
1EffectiveSoft45 / 472Gearheart50 / 413Accedia46 / 434Solvd, Inc.33 / 495Softermii38 / 41The Industry Leaders in detail
The 2 highest-scoring firms in the Industry Leaders quadrant. Each has both Core Competencies and 360-Performance ≥ 50. Click any card for the full profile.
1LEADER
QA MentorSponsored
Core Competencies100
360-Performance53
2LEADER
Core Competencies61
360-Performance50
How firms are placed on the matrix
Every position on this chart is the output of the Goodfirms ranking algorithm - a weighted composite of signals across two axes. The algorithm is recomputed regularly and is fully documented.
Sponsorship does not affect placement. PRO members receive visible badges and ad placements, but their algorithmic scores are calculated identically to free listings.
Read the full methodologyAlgorithm at a glance
1
X-axis (Core Competencies): Service Focus Ratio + Portfolio Depth + Quality + Experience
2
Y-axis (360-Performance): Client Reviews + Market Presence + Goodfirms Score
3
Missing signals are excluded from a firm's score, not substituted with defaults - weights redistribute across remaining inputs
4
Recency decay over the last 18 months keeps stale reviews from dominating
5
Eligibility floor: ≥ 1 published review in this category scope
San Francisco · $0-24/hr